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Cheap flights from Seattle to London Heathrow Airport from £189

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/11. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
SEA — LHR
6 Jun — 13 Jun1
1 adult
Thu 6/6
Thu 13/6

The best prices from Seattle/Tacoma Intl to London Heathrow are usually found in January or February, booked 75 days in advance, depart on a Wednesday or Friday and return on a Wednesday

Cheap flight deals from Seattle to Heathrow

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Heathrow (LHR). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 1 June 2024.

Popular in

June

Cheapest in

January

Average price

£968

Round-trip from

£68
High demand for flights, 29% potential price rise
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Best time to find cheap flights, 20% potential price drop
Search Deals
Average for round-trip flights in June 2024
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From Seattle/Tacoma Intl to London Heathrow
Search Deals

What is the cheapest day to fly round-trip from Seattle to London Heathrow Airport?

Departing on a Tuesday is a good option for securing a great price. You can expect to save up to 30% when planning your travel around this day of the week.

How far in advance should I book a flight from Seattle to London Heathrow Airport?

Travelers have found it’s best to book a flight 8 days in advance to save up to 51% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 8 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Seattle to London Heathrow Airport 1-2 weeks in advance for as low as £523, or £862 for flights within the next 24 hours.

What is the cheapest month to fly from Seattle to London Heathrow Airport?

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, November can be a great choice for travel to London Heathrow Airport. Flights to London Heathrow Airport from Seattle in November are about £674 on average during November, but can be found for as low as £439.

What is the cheapest time of day to fly from SEA to LHR?

Unlike at midday, when flights are generally more expensive, you can save up to 16% on flights from Seattle to London Heathrow Airport by exploring options for tickets in the morning.

Cheap United Airlines flights from Seattle to Heathrow

Explore cheap flight options specifically provided by United Airlines for the route between Seattle and Heathrow. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 909,873 searches. Data last updated 1 June 2024.
Consider these cheap United Airlines flights we've found departing from Seattle to London. It's recommended that users confirm their flight details before booking.
Wed 27/1105:50SEA - LHR
1 stop22h 00mUnited Airlines
Wed 4/1213:25LHR - SEA
2 stops30h 15mUnited Airlines
Deal found 31/5£461
Wed 2/1012:50SEA - LHR
1 stop13h 50mUnited Airlines
Fri 18/1009:00LHR - SEA
1 stop15h 59mUnited Airlines
Deal found 31/5£463
Wed 11/906:45SEA - LHR
2 stops21h 00mUnited Airlines
Mon 23/909:30LHR - SEA
1 stop34h 45mUnited Airlines
Deal found 1/6£549

  • If you’re travelling from Seattle to London Heathrow Airport, one of the more common airlines travelling that route is United Airlines. Flights on this route from United Airlines typically cost £886.96 RT, a price that is 52% cheaper than the average Seattle to London Heathrow Airport flight. The cheapest flight found was £674 RT. When travelling from Seattle to London Heathrow Airport on United Airlines, the most popular airport to depart from is Seattle/Tacoma Intl Airport and the most popular airport to arrive at is London Heathrow Airport. When flying from Seattle to London Heathrow Airport, United Airlines flights are 5% more popular than any other airline flying that same route.

Cheap Delta flights from Seattle to Heathrow

Explore cheap flight options specifically provided by Delta for the route between Seattle and Heathrow. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 909,873 searches. Data last updated 1 June 2024.
Have a look at some of the cheapest available Delta flights departing from Seattle and landing in London. Deals are refreshing constantly so come back soon for more options.
Tue 8/1021:10SEA - LHR
Nonstop9h 40mDelta
Tue 15/1006:15LHR - SEA
1 stop13h 05mDelta
Deal found 31/5£465
Tue 1/1016:30SEA - LHR
Nonstop9h 20mDelta
Tue 15/1006:15LHR - SEA
1 stop13h 05mDelta
Deal found 31/5£465
Sun 22/900:30SEA - LHR
1 stop22h 45mDelta
Tue 22/1006:15LHR - SEA
1 stop19h 35mDelta
Deal found 31/5£468
Sun 20/1006:30SEA - LHR
1 stop16h 45mDelta
Thu 7/1111:35LHR - SEA
Nonstop9h 55mDelta
Deal found 31/5£469
Sun 24/1106:30SEA - LHR
1 stop16h 35mDelta
Wed 11/1211:35LHR - SEA
Nonstop9h 55mDelta
Deal found 1/6£473
Sat 5/1022:55SEA - LHR
1 stop13h 15mDelta
Fri 18/1016:50LHR - SEA
Nonstop10h 25mDelta
Deal found 31/5£474
Sat 26/1000:35SEA - LHR
1 stop23h 30mDelta
Tue 12/1106:20LHR - SEA
1 stop14h 00mDelta
Deal found 31/5£476
Mon 23/913:40SEA - LHR
1 stop13h 40mDelta
Mon 7/1017:35LHR - SEA
1 stop25h 45mDelta
Deal found 31/5£477
Tue 8/1000:35SEA - LHR
1 stop22h 40mDelta
Wed 16/1017:35LHR - SEA
1 stop25h 45mDelta
Deal found 30/5£478

  • Delta is one of the most popular airlines used for those travelling from Seattle to London Heathrow Airport. Flights on this route from Delta typically cost £905.02 RT, a price that is 51% cheaper than the average Seattle to London Heathrow Airport flight. The cheapest flight found was £638 RT. When travelling from Seattle to London Heathrow Airport on Delta, the most popular airport to depart from is Seattle/Tacoma Intl Airport and the most popular airport to arrive at is London Heathrow Airport. When flying from Seattle to London Heathrow Airport, Delta flights are 4% more popular than any other airline flying that same route.

Cheap Seattle to Heathrow flights in June & July 2024

Find cheap flight options from Seattle to Heathrow specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 909,873 searches. Prices were last updated on 1 June 2024.
The lowest fares we've come across on flights travelling from Seattle to London in June and July 2024. Check back in a little while for more flight options.
Mon 17/623:00SEA - LHR
1 stop13h 20mIcelandair
Tue 10/913:05LHR - SEA
1 stop15h 30mIcelandair
Deal found 31/5£578
Sun 30/623:00SEA - LHR
1 stop28h 55mIcelandair
Thu 5/913:10LHR - SEA
1 stop15h 25mIcelandair
Deal found 31/5£595
Mon 24/623:00SEA - LHR
1 stop13h 20mIcelandair
Fri 30/813:05LHR - SEA
1 stop15h 30mIcelandair
Deal found 31/5£612
Mon 17/623:00SEA - LHR
1 stop13h 20mIcelandair
Tue 10/913:05LHR - SEA
1 stop15h 30mIcelandair
Deal found 1/6£613
Mon 24/615:10SEA - LHR
2 stops14h 10mAir Canada
Fri 30/810:15LHR - SEA
2 stops20h 05mAir Canada
Deal found 31/5£692
Mon 17/615:10SEA - LHR
1 stop14h 10mMultiple Airlines
Wed 11/910:50LHR - SEA
2 stops19h 30mMultiple Airlines
Deal found 1/6£694
Mon 24/613:10SEA - LHR
1 stop14h 40mAir Canada
Fri 30/810:15LHR - SEA
2 stops20h 05mAir Canada
Deal found 31/5£695
Tue 18/610:40SEA - LHR
2 stops17h 10mMultiple Airlines
Tue 10/910:50LHR - SEA
2 stops19h 30mMultiple Airlines
Deal found 31/5£698
Mon 17/621:10SEA - LHR
Nonstop9h 40mAir France
Tue 10/906:15LHR - SEA
1 stop13h 05mAir France
Deal found 31/5£699

Seattle to Heathrow 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Heathrow in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 909,873 searches. Data last updated 1 June 2024.
The lowest fares we've come across on flights travelling from Seattle to London in June and July 2024. Check back in a little while for more flight options.
Thu 10/1015:50SEA - LHR
1 stop12h 05mIcelandair
Wed 16/1021:25LHR - SEA
1 stop28h 30mIcelandair
Deal found 1/6£427
Tue 15/1015:10SEA - LHR
1 stop14h 10mLufthansa
Tue 29/1007:40LHR - SEA
1 stop13h 40mLufthansa
Deal found 31/5£434
Thu 28/1114:35SEA - LHR
1 stop20h 45mIcelandair
Wed 4/1212:15LHR - SEA
1 stop12h 45mIcelandair
Deal found 31/5£440
Mon 28/1015:35SEA - LHR
1 stop12h 20mIcelandair
Wed 13/1112:15LHR - SEA
1 stop12h 45mIcelandair
Deal found 31/5£442
Wed 9/1015:10SEA - LHR
1 stop14h 10mLufthansa
Wed 16/1014:10LHR - SEA
1 stop12h 16mLufthansa
Deal found 31/5£444
Tue 15/1015:10SEA - LHR
1 stop14h 10mLufthansa
Tue 22/1014:10LHR - SEA
1 stop30h 20mLufthansa
Deal found 1/6£445
Wed 20/1114:35SEA - LHR
1 stop12h 20mIcelandair
Mon 2/1212:15LHR - SEA
1 stop12h 45mIcelandair
Deal found 31/5£447
Mon 2/1215:20SEA - LHR
Nonstop9h 25mVirgin Atlantic
Tue 10/1211:35LHR - SEA
Nonstop9h 55mVirgin Atlantic
Deal found 31/5£450
Wed 6/1115:20SEA - LHR
1 stop12h 30mLufthansa
Tue 12/1106:35LHR - SEA
1 stop14h 45mLufthansa
Deal found 1/6£451

Direct flights to Heathrow from Seattle

Discover direct flight options from Seattle to Heathrow. Find direct flights with no stopovers, providing a convenient travel experience. Explore direct flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 909,873 searches. Data last updated 1 June 2024.
To help reduce your travel time, choose from one of these non-stop flights from Seattle to London. Those looking to potentially save on 1 or 2-stop flights from Seattle to London should utilise the search form at the top of the page.
Tue 15/1013:30SEA - LHR
Nonstop9h 20mIberia
Thu 24/1009:45LHR - SEA
Nonstop9h 45mIberia
Deal found 1/6£466
Sun 20/1013:40SEA - LHR
Nonstop9h 20mBritish Airways
Fri 8/1114:50LHR - SEA
Nonstop9h 55mBritish Airways
Deal found 31/5£469
Tue 8/1013:30SEA - LHR
Nonstop9h 20mBritish Airways
Thu 24/1009:45LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 31/5£470
Wed 20/1118:45SEA - LHR
Nonstop9h 20mBritish Airways
Wed 4/1214:50LHR - SEA
Nonstop9h 55mBritish Airways
Deal found 30/5£471
Thu 10/1016:30SEA - LHR
Nonstop9h 20mVirgin Atlantic
Wed 16/1012:45LHR - SEA
Nonstop9h 55mVirgin Atlantic
Deal found 1/6£500
Fri 27/921:15SEA - LHR
Nonstop9h 35mKLM
Wed 16/1016:50LHR - SEA
Nonstop10h 25mKLM
Deal found 31/5£509
Thu 19/916:30SEA - LHR
Nonstop9h 20mDelta
Tue 17/1216:35LHR - SEA
Nonstop10h 25mDelta
Deal found 31/5£510
Mon 7/1021:10SEA - LHR
Nonstop9h 40mKLM
Sat 19/1016:50LHR - SEA
Nonstop10h 25mKLM
Deal found 31/5£523
Mon 2/921:15SEA - LHR
Nonstop9h 35mDelta
Wed 11/916:50LHR - SEA
Nonstop10h 30mDelta
Deal found 31/5£530

Seattle to Heathrow flights leaving soon

Find last-minute flight options from Seattle to Heathrow for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 909,873 searches. Data last updated 1 June 2024.
Book one of these great deals on flights from Seattle to London. Users should double check the flight they book to ensure it matches the day, time, and destination they're looking for.
Fri 7/607:40SEA - LHR
2 stops21h 55mMultiple Airlines
Mon 10/618:40LHR - SEA
2 stops30h 19mMultiple Airlines
Deal found 1/6£721
Thu 6/605:55SEA - LHR
3 stops31h 40mMultiple Airlines
Wed 12/606:45LHR - SEA
3 stops33h 47mMultiple Airlines
Deal found 31/5£731
Sun 9/607:00SEA - LHR
1 stop21h 05mMultiple Airlines
Thu 13/608:05LHR - SEA
3 stops35h 15mMultiple Airlines
Deal found 31/5£822
Thu 6/614:04SEA - LHR
2 stops19h 36mMultiple Airlines
Thu 13/610:30LHR - SEA
2 stops20h 22mMultiple Airlines
Deal found 31/5£832
Thu 6/617:05SEA - LHR
1 stop19h 35mMultiple Airlines
Wed 12/607:30LHR - SEA
1 stop13h 45mMultiple Airlines
Deal found 31/5£833
Thu 6/617:05SEA - LHR
1 stop17h 35mMultiple Airlines
Thu 13/607:30LHR - SEA
1 stop15h 30mMultiple Airlines
Deal found 31/5£843
Thu 6/623:10SEA - LHR
3 stops23h 20mMultiple Airlines
Mon 10/617:30LHR - SEA
3 stops32h 10mMultiple Airlines
Deal found 31/5£854
Sat 8/614:04SEA - LHR
2 stops19h 36mMultiple Airlines
Fri 14/606:30LHR - SEA
2 stops19h 39mMultiple Airlines
Deal found 31/5£855
Sat 8/614:04SEA - LHR
2 stops20h 36mMultiple Airlines
Thu 20/606:30LHR - SEA
2 stops21h 17mMultiple Airlines
Deal found 31/5£863

One-way flights to Heathrow from Seattle

Search for one-way flight options from Seattle to Heathrow. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 909,873 searches. Data last updated 1 June 2024.
Users in need of a one-way flight from Seattle to London can choose from these deals. Users can also find round-trip Seattle to London flights by using the search form above.
Mon 11/1114:35SEA - LHR
1 stop20h 45mIcelandair
Deal found 31/5£189
Sun 29/918:55SEA - LHR
1 stop17h 25mIcelandair
Deal found 31/5£193
Wed 16/1015:50SEA - LHR
1 stop12h 05mIcelandair
Deal found 31/5£194
Sun 6/1018:55SEA - LHR
1 stop33h 00mIcelandair
Deal found 30/5£195
Sun 20/1015:50SEA - LHR
1 stop12h 05mIcelandair
Deal found 31/5£196
Sun 24/1114:35SEA - LHR
1 stop20h 45mIcelandair
Deal found 31/5£197
Sun 29/918:55SEA - LHR
1 stop33h 00mIcelandair
Deal found 1/6£198
Tue 15/1015:50SEA - LHR
1 stop12h 05mIcelandair
Deal found 31/5£206
Tue 22/1015:10SEA - LHR
1 stop14h 10mLufthansa
Deal found 31/5£213

Find flights from Seattle to Heathrow within your budget

Customise your flight search to find flights from Seattle to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 909,873 searches. Data last updated 1 June 2024.

Fly from

Any airport

Fly to

Any airport

Budget

£427 - £471

Route

Depart

Return

Price

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 10/10

1 stop12h 05m

London Heathrow

Wed 16/10

1 stop28h 30m

£427

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 15/10

1 stop14h 10m

London Heathrow

Tue 29/10

1 stop13h 40m

£434

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 1/10

1 stop18h 20m

London Heathrow

Tue 8/10

2 stops17h 46m

£457

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 6/10

1 stop14h 10m

London Heathrow

Thu 24/10

2 stops17h 46m

£457

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 27/11

1 stop22h 00m

London Heathrow

Wed 4/12

2 stops30h 15m

£461

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 8/10

Nonstop9h 40m

London Heathrow

Tue 15/10

1 stop13h 05m

£465

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 24/9

Nonstop9h 35m

London Heathrow

Wed 9/10

1 stop13h 05m

£466

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 1/10

1 stop13h 15m

London Heathrow

Tue 8/10

1 stop13h 05m

£468

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 13/10

2 stops24h 35m

London Heathrow

Mon 21/10

2 stops30h 21m

£471

Flights are sorted by cheapest first

Deals found on 1/6

How far ahead should I book a flight from Seattle to London Heathrow Airport?

Use this chart to determine the optimal time to book a return flight from Seattle to Heathrow. Price data was last updated on 24 May 2024.
The price you pay for your flight from Seattle to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 75 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Search Deals

What is the cheapest day to fly from Seattle to London Heathrow Airport?

Use this chart to determine the cheapest time to fly return from Seattle to Heathrow. Price data was last updated on 26 May 2024.
Morning
Midday
Afternoon
Evening
All times are departure.
Travellers seeking maximum savings on their Seattle to London Heathrow Airport flight should consider departing on Thursday at midday when fares are most often at their lowest. Sunday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Best time to book a flight from Seattle to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Seattle with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Temperature and rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature and rainfall totals by month.

LON

Temperature

4 - 17 °C

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated 1 June 2024.
Read reviews from past customers who have flown United Airlines, Delta and Icelandair from Seattle to London. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
10,410 reviews
Check prices

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Entertainment

8.0

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Delta
8.0
Very Good
10,410 reviews
Delta
8.0
Very Good
10,410 reviews
Check prices

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Entertainment

8.0

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

KLM
7.9
Good
1,512 reviews
Delta
8.0
Very Good
10,410 reviews
Check prices

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Entertainment

8.0

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

SWISS
7.8
Good
1,941 reviews
Delta
8.0
Very Good
10,410 reviews
Check prices

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Entertainment

8.0

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Finnair
7.8
Good
1,368 reviews
Delta
8.0
Very Good
10,410 reviews
Check prices

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Entertainment

8.0

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

JetBlue
7.6
Good
4,346 reviews
Delta
8.0
Very Good
10,410 reviews
Check prices

Overall

8.0

Food

7.4

Boarding

8.2

Crew

8.6

Comfort

7.9

Entertainment

8.0

Reviews

1 / 10

Bad experience with the staff boarding the gate. I couldn’t board with my carry on, personal item and a funny bag. I had to put my passport inside my pockets and put the funny bag inside the personal item. Then after passing the staff pull out everything again.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to London Heathrow?

    If you book a flight to London Heathrow from Seattle, you will be flying from Seattle/Tacoma Intl, which is the city’s only airport. Seattle/Tacoma Intl (SEA) is located 11.4 mi from the center of Seattle. There are 19 flights from Seattle/Tacoma Intl to London Heathrow per day from 5 different airlines.

  • Can I find flights from Seattle to London Heathrow Airport for under £500 on Cheapflights?

    Yes, there are multiple flights from Seattle to London Heathrow Airport for under £500. The cheapest flight booked recently is on Icelandair for just £427, but on average you can expect to pay £453.

  • Are there nonstop flights from Seattle to London Heathrow Airport for under £500 on Cheapflights?

    Cheapflights has at least 20 direct flights from Seattle to London Heathrow Airport under £500. A good price for a nonstop flight from Seattle to London Heathrow Airport is less than £523.

  • Are there last-minute flights available from Seattle to London Heathrow Airport for under £800?

    There are currently 20+ open flights from Seattle to London Heathrow Airport within the next 7 days for less than £800.

  • What days are direct flights available from Seattle to London Heathrow Airport?

    Days when direct flights are available for this flight are: Sunday, Monday, Wednesday, Saturday.

  • How many flights depart from Seattle to London Heathrow Airport on average per day?

    Per day, 3 flights depart from Seattle to London Heathrow Airport on average.
    Evening (6pm - Midnight) - 100% of flight departures

  • How long is the flight from Seattle to London Heathrow Airport?

    For as low as £427, Icelandair can have you in London Heathrow Airport from Seattle in 12h 05m. The distance from Seattle to London Heathrow Airport is about 4812 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Seattle to London Heathrow Airport round-trip?

    Cheapflights users have booked flights from Seattle to London Heathrow Airport round-trip from £427. Other airlines that can offer you cheap pricing are Lufthansa, from £434, and Air Canada, from £457. You may be able to fly from Seattle to London Heathrow Airport for 37% less than the average price by searching for these airlines.

  • What are the most reliable airlines from Seattle to London Heathrow Airport?

    Consider American Airlines (71%), Aer Lingus (71%) or Finnair (71%) when booking your flight. These represent the most reliable airlines when flying from Seattle to London Heathrow Airport.

  • What are the cheapest flights from Seattle to London Heathrow Airport?

    While on average a flight from Seattle to London Heathrow Airport is generally £642, our data shows the cheapest flight currently is £365. When looking at the most popular route, (Seattle/Tacoma Intl - London Heathrow), you can expect to pay £434 for that flight.

  • What does SEA to LHR mean?

    These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Seattle/Tacoma Intl Airport to London Heathrow Airport flight would often be abbreviated as a SEA to LHR flight.

  • Can I find deals for flights from Seattle to Heathrow that include extra baggage allowance?

    The amount of baggage you can bring on your Seattle to Heathrow flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Seattle to Heathrow with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to Heathrow flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Seattle to Heathrow that include hotel bookings?

    Yes. In addition to deals on Seattle to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Heathrow.

  • Can I find deals for business class flights from Seattle to Heathrow?

    Yes. Cheapflights offers flight deals from Seattle to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Seattle to Heathrow that allow pets onboard?

    Many airlines flying from Seattle to Heathrow offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Seattle to Heathrow?

    Yes, you can often find last-minute deals on Seattle to Heathrow flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Seattle to London Heathrow Airport flight deals updated?

    The Seattle to London Heathrow Airport flight deals you see on this page were last updated on 1/6.

  • What are the most popular airlines that fly from Seattle to London Heathrow Airport?

    When booking a flight from Seattle to London Heathrow Airport, you may want to consider flying on Air France, Finnair or British Airways as they are the most popular for this route.

  • What is the cheapest month to book a flight from Seattle to London Heathrow Airport?

    Currently, January is the cheapest month in which you can book a flight from Seattle to London Heathrow Airport (average of £110). Flying from Seattle to London Heathrow Airport in June is currently the most expensive (average of £162). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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Top 5 airlines flying from Seattle to Heathrow

Discover the top 5 airlines that operate flights from Seattle to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 909,873 searches. Data last updated 1 June 2024.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£425Average£524FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£500Average£710FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£522Average£649FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air FranceCheapest£526Average£610FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£529Average£696FlexibilityNo cancel feeOn-time76%
Search Finnair flights
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Search flights from Seattle to Heathrow by cabin class

Find flights from Seattle to Heathrow, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
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Hourly flight availability from Seattle to Heathrow

Find hourly flight availability from Seattle to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 1 June 2024.
0%of flight departuresEarly morningMidnight to 6 am
0%of flight departuresMorning6 am to noon
65%of flight departuresAfternoonNoon to 6 pm
35%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Midday
6 PM

Weekly flight availability from Seattle to Heathrow

Explore weekly flight availability from Seattle to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 1 June 2024.
Monday20daily flights
Tuesday15daily flights
Wednesday20daily flights
Thursday20daily flights
Friday20daily flights
Saturday20daily flights
Sunday20daily flights

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Fly with Cheapflights

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How does Cheapflights help users find flights from Seattle to Heathrow?

Cheapflights helps you search for flights from Seattle to Heathrow via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Heathrow?

Cheapflights helps you find that perfect flight to Heathrow from Seattle by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Seattle to Heathrow with no change fees?

Yes! Cheapflights helps users easily find flights from Seattle to Heathrow with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Heathrow become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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