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Cheap flights from Seattle to London Heathrow Airport from £185

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 27/5. 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
13 May — 20 May1
1 adult
Mon 13/5
Mon 20/5

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 Thursday 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 8 May 2024.

Popular in

June

Cheapest in

January

Average price

£717

Round-trip from

£69
High demand for flights, 28% 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 May 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 37% 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 65% 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 £515, or £924 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 £687 on average during November, but can be found for as low as £447.

When is the cheapest time to fly from Seattle to London Heathrow Airport (SEA - LHR)?

Unlike at midday, when flights are generally more expensive, you can save up to 19% on flights from Seattle to London Heathrow Airport by exploring options for tickets in the morning.

Cheap Icelandair flights from Seattle to Heathrow

Explore cheap flight options specifically provided by Icelandair 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 876,769 searches. Data last updated 8 May 2024.
Consider these cheap Icelandair flights we've found departing from Seattle to London. It's recommended that users confirm their flight details before booking.
Tue 8/1015:50SEA - LHR
1 stop12h 05mIcelandair
Tue 22/1021:25LHR - SEA
1 stop28h 30mIcelandair
Deal found 8/5£458
Mon 14/1015:50SEA - LHR
1 stop20h 30mIcelandair
Mon 21/1021:25LHR - SEA
1 stop28h 30mIcelandair
Deal found 6/5£461
Wed 23/1015:50SEA - LHR
1 stop12h 05mIcelandair
Thu 7/1120:25LHR - SEA
1 stop28h 35mIcelandair
Deal found 7/5£462
Tue 22/1015:50SEA - LHR
1 stop12h 05mIcelandair
Mon 4/1120:25LHR - SEA
1 stop28h 35mIcelandair
Deal found 6/5£463
Sun 6/1018:55SEA - LHR
1 stop17h 25mIcelandair
Mon 14/1021:25LHR - SEA
1 stop28h 30mIcelandair
Deal found 6/5£468
Wed 9/1015:50SEA - LHR
1 stop20h 30mIcelandair
Wed 16/1021:25LHR - SEA
1 stop28h 30mIcelandair
Deal found 7/5£470
Wed 23/1015:50SEA - LHR
1 stop12h 05mIcelandair
Wed 30/1020:25LHR - SEA
1 stop28h 35mIcelandair
Deal found 6/5£474
Tue 1/1018:55SEA - LHR
1 stop17h 25mIcelandair
Tue 15/1021:25LHR - SEA
1 stop28h 30mIcelandair
Deal found 7/5£482
Tue 8/1015:50SEA - LHR
1 stop20h 30mIcelandair
Wed 16/1013:05LHR - SEA
1 stop12h 50mIcelandair
Deal found 6/5£484

  • Icelandair is one of the most popular airlines used for those travelling from Seattle to London Heathrow Airport. Flights from Icelandair travelling this route typically cost £916.39 RT. This price is typically 50% more expensive than other airlines that offer Seattle to London Heathrow Airport flights. When booking this route, the cheapest RT price found was £638. The most popular departure airport in Seattle when flying to London Heathrow Airport is Seattle/Tacoma Intl Airport. The most popular airport to fly into when visiting London Heathrow Airport is London Heathrow Airport. When flying from Seattle to London Heathrow Airport, Icelandair flights are 5% more popular than any other airline flying that same route.

Cheap Iberia flights from Seattle to Heathrow

Explore cheap flight options specifically provided by Iberia 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 876,769 searches. Data last updated 8 May 2024.
Have a look at some of the cheapest available Iberia flights departing from Seattle and landing in London. Deals are refreshing constantly so come back soon for more options.
Tue 8/1019:40SEA - LHR
Nonstop9h 20mIberia
Tue 22/1009:50LHR - SEA
Nonstop9h 45mIberia
Deal found 8/5£491
Mon 14/1013:30SEA - LHR
Nonstop9h 20mIberia
Mon 21/1009:50LHR - SEA
Nonstop9h 45mIberia
Deal found 7/5£530
Sun 11/807:20SEA - LHR
1 stop15h 05mIberia
Wed 28/809:50LHR - SEA
Nonstop9h 45mIberia
Deal found 7/5£546
Thu 8/819:40SEA - LHR
Nonstop9h 20mIberia
Tue 27/812:15LHR - SEA
1 stop15h 05mIberia
Deal found 7/5£589
Sat 18/513:50SEA - LHR
Nonstop9h 20mIberia
Sat 15/612:15LHR - SEA
1 stop15h 33mIberia
Deal found 7/5£703

  • One of the most popular airlines travelling from Seattle to London Heathrow Airport is Iberia. Flights on this route from Iberia typically cost £886.96 RT, a price that is 55% more expensive than the average Seattle to London Heathrow Airport flight. The cheapest flight found was £674 RT. The most popular departure airport in Seattle when flying to London Heathrow Airport is Seattle/Tacoma Intl Airport. The most popular airport to fly into when visiting London Heathrow Airport is London Heathrow Airport. When flying from Seattle to London Heathrow Airport, Iberia flights are 5% more popular than any other airline flying that same route.

Cheap Seattle to Heathrow flights in May & June 2024

Find cheap flight options from Seattle to Heathrow specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 876,769 searches. Prices were last updated on 8 May 2024.
The lowest fares we've come across on flights travelling from Seattle to London in May and June 2024. Check back in a little while for more flight options.
Sun 12/516:30SEA - LHR
Nonstop9h 20mVirgin Atlantic
Tue 28/506:15LHR - SEA
1 stop13h 05mVirgin Atlantic
Deal found 7/5£599
Sun 19/510:40SEA - LHR
2 stops15h 20mMultiple Airlines
Thu 6/608:40LHR - SEA
2 stops17h 47mMultiple Airlines
Deal found 7/5£601
Tue 21/510:40SEA - LHR
1 stop18h 40mLufthansa
Tue 4/610:50LHR - SEA
1 stop14h 09mLufthansa
Deal found 7/5£603
Mon 20/515:10SEA - LHR
1 stop14h 10mLufthansa
Tue 11/610:50LHR - SEA
1 stop14h 09mLufthansa
Deal found 7/5£604
Sun 12/516:30SEA - LHR
Nonstop9h 20mVirgin Atlantic
Tue 28/506:15LHR - SEA
1 stop13h 05mVirgin Atlantic
Deal found 7/5£605
Wed 15/508:20SEA - LHR
1 stop20h 00mUnited Airlines
Fri 31/509:00LHR - SEA
1 stop15h 59mUnited Airlines
Deal found 7/5£607
Wed 15/516:30SEA - LHR
Nonstop9h 20mDelta
Thu 23/506:15LHR - SEA
1 stop13h 05mDelta
Deal found 7/5£609
Mon 20/515:10SEA - LHR
1 stop14h 10mLufthansa
Wed 5/606:30LHR - SEA
2 stops15h 57mLufthansa
Deal found 7/5£609
Sun 12/515:10SEA - LHR
2 stops36h 40mLufthansa
Tue 28/520:25LHR - SEA
2 stops50h 02mLufthansa
Deal found 7/5£611

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 876,769 searches. Data last updated 8 May 2024.
The lowest fares we've come across on flights travelling from Seattle to London in May and June 2024. Check back in a little while for more flight options.
Mon 14/1015:50SEA - LHR
1 stop20h 30mIcelandair
Mon 21/1021:25LHR - SEA
1 stop28h 30mIcelandair
Deal found 6/5£461
Wed 23/1015:50SEA - LHR
1 stop12h 05mIcelandair
Thu 7/1120:25LHR - SEA
1 stop28h 35mIcelandair
Deal found 7/5£462
Tue 22/1015:50SEA - LHR
1 stop12h 05mIcelandair
Mon 4/1120:25LHR - SEA
1 stop28h 35mIcelandair
Deal found 6/5£463
Sun 6/1018:55SEA - LHR
1 stop17h 25mIcelandair
Mon 14/1021:25LHR - SEA
1 stop28h 30mIcelandair
Deal found 6/5£468
Wed 9/1015:50SEA - LHR
1 stop20h 30mIcelandair
Wed 16/1021:25LHR - SEA
1 stop28h 30mIcelandair
Deal found 7/5£470
Wed 23/1015:50SEA - LHR
1 stop12h 05mIcelandair
Wed 30/1020:25LHR - SEA
1 stop28h 35mIcelandair
Deal found 6/5£474
Tue 1/1018:55SEA - LHR
1 stop17h 25mIcelandair
Tue 15/1021:25LHR - SEA
1 stop28h 30mIcelandair
Deal found 7/5£482
Tue 8/1015:50SEA - LHR
1 stop20h 30mIcelandair
Wed 16/1013:05LHR - SEA
1 stop12h 50mIcelandair
Deal found 6/5£484
Sun 13/1015:50SEA - LHR
1 stop20h 30mIcelandair
Mon 21/1021:25LHR - SEA
1 stop28h 30mIcelandair
Deal found 7/5£485

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 876,769 searches. Data last updated 8 May 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.
Sun 22/919:40SEA - LHR
Nonstop9h 20mAmerican Airlines
Tue 22/1009:50LHR - SEA
Nonstop9h 45mAmerican Airlines
Deal found 7/5£491
Wed 23/1016:30SEA - LHR
Nonstop9h 20mVirgin Atlantic
Wed 6/1116:35LHR - SEA
Nonstop10h 25mVirgin Atlantic
Deal found 7/5£504
Wed 25/919:40SEA - LHR
Nonstop9h 20mBritish Airways
Wed 9/1016:00LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 7/5£509
Tue 1/1021:10SEA - LHR
Nonstop9h 40mKLM
Tue 15/1016:50LHR - SEA
Nonstop10h 25mKLM
Deal found 6/5£522
Tue 24/921:15SEA - LHR
Nonstop9h 35mKLM
Wed 9/1016:50LHR - SEA
Nonstop10h 25mKLM
Deal found 7/5£522
Tue 22/1021:10SEA - LHR
Nonstop9h 40mKLM
Thu 7/1116:35LHR - SEA
Nonstop10h 25mKLM
Deal found 7/5£523
Thu 31/1014:35SEA - LHR
Nonstop9h 25mBritish Airways
Thu 7/1114:50LHR - SEA
Nonstop9h 55mBritish Airways
Deal found 7/5£530
Mon 23/921:15SEA - LHR
Nonstop9h 35mKLM
Thu 3/1016:50LHR - SEA
Nonstop10h 25mKLM
Deal found 7/5£538
Wed 24/713:30SEA - LHR
Nonstop9h 20mBritish Airways
Wed 28/809:50LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 7/5£541

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 876,769 searches. Data last updated 8 May 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.
Wed 15/508:20SEA - LHR
1 stop20h 00mUnited Airlines
Fri 31/509:00LHR - SEA
1 stop15h 59mUnited Airlines
Deal found 7/5£607
Wed 15/516:30SEA - LHR
Nonstop9h 20mDelta
Thu 23/506:15LHR - SEA
1 stop13h 05mDelta
Deal found 7/5£609
Wed 15/521:10SEA - LHR
Nonstop9h 40mDelta
Fri 31/506:15LHR - SEA
1 stop13h 05mDelta
Deal found 7/5£609
Mon 13/510:40SEA - LHR
2 stops17h 10mLufthansa
Thu 30/520:25LHR - SEA
1 stop28h 34mLufthansa
Deal found 7/5£611
Mon 13/508:35SEA - LHR
1 stop14h 40mAir France
Thu 30/511:30LHR - SEA
1 stop14h 10mAir France
Deal found 7/5£613
Wed 15/516:30SEA - LHR
Nonstop9h 20mDelta
Thu 23/512:45LHR - SEA
Nonstop9h 55mDelta
Deal found 7/5£614
Wed 15/521:10SEA - LHR
Nonstop9h 40mKLM
Fri 31/516:50LHR - SEA
Nonstop10h 30mKLM
Deal found 7/5£615
Sat 18/523:59SEA - LHR
1 stop14h 11mBritish Airways
Thu 13/609:45LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 7/5£618
Wed 15/506:38SEA - LHR
2 stops17h 52mUnited Airlines
Wed 29/506:50LHR - SEA
2 stops21h 20mUnited Airlines
Deal found 7/5£619

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 876,769 searches. Data last updated 8 May 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 27/507:00SEA - LHR
1 stop21h 05mWestJet
Deal found 7/5£185
Mon 7/1015:50SEA - LHR
1 stop12h 05mIcelandair
Deal found 7/5£199
Mon 30/918:55SEA - LHR
1 stop17h 25mIcelandair
Deal found 7/5£199
Mon 14/1015:50SEA - LHR
1 stop12h 05mIcelandair
Deal found 7/5£203
Sun 22/918:55SEA - LHR
1 stop17h 25mIcelandair
Deal found 6/5£204
Sun 13/1015:50SEA - LHR
1 stop20h 30mIcelandair
Deal found 7/5£210
Tue 1/1018:55SEA - LHR
1 stop33h 00mIcelandair
Deal found 6/5£215
Fri 18/1015:50SEA - LHR
1 stop20h 30mIcelandair
Deal found 7/5£237
Fri 18/1015:50SEA - LHR
1 stop12h 05mIcelandair
Deal found 6/5£239

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 876,769 searches. Data last updated 8 May 2024.

Fly from

Any airport

Fly to

Any airport

Budget

£458 - £514

Route

Depart

Return

Price

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 8/10

1 stop12h 05m

London Heathrow

Tue 22/10

1 stop28h 30m

£458

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 8/10

Nonstop9h 20m

London Heathrow

Tue 22/10

Nonstop9h 45m

£491

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 24/9

1 stop14h 25m

London Heathrow

Wed 2/10

Nonstop9h 45m

£493

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 22/9

1 stop14h 20m

London Heathrow

Tue 22/10

Nonstop9h 45m

£494

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 23/10

Nonstop9h 20m

London Heathrow

Wed 6/11

1 stop14h 00m

£499

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 1/10

2 stops16h 40m

London Heathrow

Tue 15/10

2 stops17h 46m

£509

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 8/10

1 stop18h 20m

London Heathrow

Tue 22/10

2 stops17h 46m

£510

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 9/10

2 stops17h 10m

London Heathrow

Wed 16/10

2 stops22h 55m

£511

Seattle/Tacoma IntlLondon Heathrow

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 22/10

2 stops18h 57m

London Heathrow

Tue 5/11

1 stop13h 55m

£514

Flights are sorted by cheapest first

Deals found on 8/5

When is the best time to 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 3 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

When is the cheapest time 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 5 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

Average price of flights to Heathrow by month

Plan your trip from Seattle to Heathrow by taking into account the cheapest months to travel. The average price of a one-way flight from Seattle to Heathrow is currently £210 while a return flight costs £498. Price data was last updated on 28 April 2024.

Currently, January is the cheapest month in which you can book a flight from Seattle to London Heathrow Airport (average of £111). Flying from Seattle to London Heathrow Airport in July is currently the most expensive (average of £170). 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.

January

£89

February

£99

March

£95

April

£104

May

£105

June

£132

July

£136

August

£116

September

£111

October

£127

November

£92

December

£97

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 8 May 2024.
Read reviews from past customers who have flown Icelandair, Iberia and American Airlines from Seattle to London. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.1
Very Good
10,810 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.6

Entertainment

8.0

Food

7.4

Overall

8.1

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
8.1
Very Good
10,810 reviews
Delta
8.1
Very Good
10,810 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.6

Entertainment

8.0

Food

7.4

Overall

8.1

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
1,598 reviews
Delta
8.1
Very Good
10,810 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.6

Entertainment

8.0

Food

7.4

Overall

8.1

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
2,011 reviews
Delta
8.1
Very Good
10,810 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.6

Entertainment

8.0

Food

7.4

Overall

8.1

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.

Virgin Atlantic
7.7
Good
740 reviews
Delta
8.1
Very Good
10,810 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.6

Entertainment

8.0

Food

7.4

Overall

8.1

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.

Air France
7.5
Good
1,779 reviews
Delta
8.1
Very Good
10,810 reviews
Check prices

Comfort

7.9

Boarding

8.2

Crew

8.6

Entertainment

8.0

Food

7.4

Overall

8.1

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 £458, but on average you can expect to pay £481.

  • 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 £542.

  • Are there last-minute flights available from Seattle to London Heathrow Airport for under £700?

    There are currently 20+ open flights from Seattle to London Heathrow Airport within the next 7 days for less than £700.

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

    Days when direct flights are available for this flight are: Friday, Saturday.

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

    Per day, 2 flights depart from Seattle to London Heathrow Airport on average.
    Afternoon (Midday - 6pm) - 100% of flight departures

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

    For as low as £458, Icelandair can have you in London Heathrow Airport from Seattle in 9h 20m. 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 £458. Other airlines that can offer you cheap pricing are Iberia, from £491, and American Airlines, from £493. You may be able to fly from Seattle to London Heathrow Airport for 34% less than the average price by searching for these airlines.

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

    Consider Air France (74%), Delta (74%) or KLM (74%) 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 £1,238, our data shows the cheapest flight currently is £374. When looking at the most popular route, (Seattle/Tacoma Intl - London Heathrow), you can expect to pay £463 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 7/5.

See more FAQs

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Alternative routes for Seattle to Heathrow
See prices for flight routes from nearby airports that may be better suited for you.

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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 876,769 searches. Data last updated 8 May 2024.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£432Average£533FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Virgin AtlanticCheapest£509Average£731FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£532Average£648FlexibilityNo cancel feeOn-time70%
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Air FranceCheapest£534Average£620FlexibilityNo cancel feeOn-time77%
Search Air France flights
FinnairCheapest£538Average£707FlexibilityNo 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.
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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 8 May 2024.
1%of flight departuresEarly morningMidnight to 6 am
0%of flight departuresMorning6 am to noon
52%of flight departuresAfternoonNoon to 6 pm
47%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 8 May 2024.
Monday20daily flights
Tuesday15daily flights
Wednesday20daily flights
Thursday20daily flights
Friday20daily flights
Saturday20daily flights
Sunday20daily flights

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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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