€390 Cheap Flights London to Seattle (LHR-SEA)

View €390 flight on Mon, 4 May 2026Opens in a new window

Popular airlines from Heathrow Airport (LHR) to Seattle-Tacoma International Airport (SEA)

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Cheap flights from London to Seattle (LHR-SEA)

Prices were available within the past 7 days and start at €390 for one-way flights and €567 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

British Airways
Fri, 26 Dec - Fri, 9 Jan
LHR
London
SEA
Seattle
€567 Return, found 6 days ago
€567
Return
found 6 days ago
Select British Airways flight, departing Fri, 26 Dec from London to Seattle, returning Fri, 9 Jan, priced at €567 found 6 days ago
Icelandair
Thu, 27 Nov - Wed, 10 Dec
LHR
London
SEA
Seattle
€575 Return, found 2 days ago
€575
Return
found 2 days ago
Select Icelandair flight, departing Thu, 27 Nov from London to Seattle, returning Wed, 10 Dec, priced at €575 found 2 days ago
Icelandair
Sun, 14 Dec - Wed, 24 Dec
LHR
London
SEA
Seattle
€578 Return, found 5 days ago
€578
Return
found 5 days ago
Select Icelandair flight, departing Sun, 14 Dec from London to Seattle, returning Wed, 24 Dec, priced at €578 found 5 days ago
Lufthansa
Tue, 8 Sept - Tue, 29 Sept
LHR
London
SEA
Seattle
€617 Return, found 5 days ago
€617
Return
found 5 days ago
Select Lufthansa flight, departing Tue, 8 Sept from London to Seattle, returning Tue, 29 Sept, priced at €617 found 5 days ago
American Airlines
Thu, 11 Jun - Mon, 15 Jun
LHR
London
SEA
Seattle
€631 Return, just found
€631
Return
just found
Select American Airlines flight, departing Thu, 11 Jun from London to Seattle, returning Mon, 15 Jun, priced at €631 just found
Brussels Airlines
Tue, 8 Sept - Tue, 29 Sept
LHR
London
SEA
Seattle
€642 Return, found 5 days ago
€642
Return
found 5 days ago
Select Brussels Airlines flight, departing Tue, 8 Sept from London to Seattle, returning Tue, 29 Sept, priced at €642 found 5 days ago
Austrian Airlines
Tue, 8 Sept - Tue, 29 Sept
LHR
London
SEA
Seattle
€642 Return, found 5 days ago
€642
Return
found 5 days ago
Select Austrian Airlines flight, departing Tue, 8 Sept from London to Seattle, returning Tue, 29 Sept, priced at €642 found 5 days ago
Air Canada
Tue, 8 Sept - Tue, 29 Sept
LHR
London
SEA
Seattle
€643 Return, found 5 days ago
€643
Return
found 5 days ago
Select Air Canada flight, departing Tue, 8 Sept from London to Seattle, returning Tue, 29 Sept, priced at €643 found 5 days ago
United
Thu, 4 Dec - Wed, 10 Dec
LHR
London
SEA
Seattle
€646 Return, found 3 days ago
€646
Return
found 3 days ago
Select United flight, departing Thu, 4 Dec from London to Seattle, returning Wed, 10 Dec, priced at €646 found 3 days ago
Delta
Thu, 11 Jun - Mon, 15 Jun
LHR
London
SEA
Seattle
€673 Return, just found
€673
Return
just found
Select Delta flight, departing Thu, 11 Jun from London to Seattle, returning Mon, 15 Jun, priced at €673 just found

Find the cheapest month to fly from London (LHR) to Seattle (SEA)

February is typically the cheapest month to fly

From €423 - €801 per traveller.

Frequently asked questions

How much is a flight from Heathrow Airport to Sea-Tac Airport?
Start packing your bags, because round-trip journeys from LHR to Seattle - Tacoma Intl. Airport (SEA) start from €567. That's based on airfares listed within the last 7 days on Expedia for flights departing within the next year. Prices can change quickly, so book now to secure the best deal. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Heathrow Airport (LHR) to Sea-Tac Airport?
Most flights can be cancelled online, but whether you incur a fee depends on your airline. If you do have to cancel your trip, follow the instructions in the Customer Service Portal.
How do I find cheap flights from Heathrow Airport to SEA that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for London Heathrow to Sea-Tac Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from Heathrow Airport (LHR) to Seattle - Tacoma Intl. Airport (SEA)?
With around 7,700 kilometres separating LHR and Seattle - Tacoma Intl. Airport (SEA), your flight will be a long one. Pack wisely to make your time on board more comfortable. Little things like an extra pair of socks and a good neck pillow can make a big difference.
Which airlines fly direct from Heathrow Airport to Sea-Tac Airport?
Getting from London Heathrow to Sea-Tac Airport is easy when you have a good range of airlines to choose from. Here are a few of the best:

  • Virgin Atlantic - (VS) with 30 monthly flights
  • American Airlines - (AA) with 30 monthly flights
  • British Airways - (BA) with 30 monthly flights
  • Delta Air Lines - (DL) with 17 monthly flights

Are Heathrow Airport to Sea-Tac Airport flight tickets cheaper when they're purchased at the last minute?
Late planners can sometimes score a bargain, with some of the cheapest airfares from London Heathrow to SEA surfacing a few weeks before the departure date. If you'd rather book ahead, Expedia compares and updates all the best flight deals continuously — as early as a year in advance in some cases. It depends on the carrier though, as not all airlines advertise prices that far in advance.

Travel information

Origin airport
Heathrow
Destination airport
Seattle - Tacoma Intl.
Airlines serving
Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, Iberia, Icelandair, KLM, Lufthansa, Turkish Airlines, United, Virgin Atlantic, WestJet
Return price
€566
Distance
7657 km
Average flight time
2 hours 9 mins

Book with confidence

Perfect flights from London to Seattle

Embark on an unforgettable journey without breaking the bank with Expedia's incredible deals on cheap flights from London to Seattle. Whether you're aching for a romantic escape with your partner, craving an adventurous solo expedition, or yearning to immerse yourself in the local history and culture, we've got you covered.
 
Picture yourself strolling through the streets of , surrounded by breathtaking architecture and absorbing the vibrant atmosphere of this captivating city. Indulge in the mouth-watering local specialties, from tantalizing street food to exquisite fine dining. With Expedia, you can experience all of this and more, without sacrificing your budget.
 
Our flexible Heathrow to Seattle - Tacoma Intl. ticket options cater to your travel preferences, with incredible one-way fares from €390 and roundtrip prices from €567. Whether you're planning a short city break or a longer adventure, our dynamic pricing ensures that you find the best deals for your journey.
 
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Planning your next great adventure is a breeze with Expedia. Our user-friendly platform, unbeatable prices, and round-the-clock customer support are designed to make your travel experience seamless and stress-free. So, why wait? Book your to travel arrangements today and embark on the journey of a lifetime in Seattle.
Perfect flights from London to Seattle

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