€493 Cheap Flights London to Seattle (LHR-SEA)

View €493 flight on Wed, 22 Oct 2025Opens 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 €493 for one-way flights and €510 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Sat, 6 Dec - Sat, 13 Dec
LHR
London
SEA
Seattle
€510 Return, found 4 days ago
€510
Return
found 4 days ago
Select Icelandair flight, departing Sat, 6 Dec from London to Seattle, returning Sat, 13 Dec, priced at €510 found 4 days ago
Aer Lingus
Mon, 8 Sep - Mon, 22 Sep
LHR
London
SEA
Seattle
€534 Return, found 3 days ago
€534
Return
found 3 days ago
Select Aer Lingus flight, departing Mon, 8 Sep from London to Seattle, returning Mon, 22 Sep, priced at €534 found 3 days ago
Lufthansa
Sat, 6 Dec - Sat, 13 Dec
LHR
London
SEA
Seattle
€552 Return, found 4 days ago
€552
Return
found 4 days ago
Select Lufthansa flight, departing Sat, 6 Dec from London to Seattle, returning Sat, 13 Dec, priced at €552 found 4 days ago
British Airways
Mon, 1 Sep - Mon, 15 Sep
LHR
London
SEA
Seattle
€588 Return, found 5 days ago
€588
Return
found 5 days ago
Select British Airways flight, departing Mon, 1 Sep from London to Seattle, returning Mon, 15 Sep, priced at €588 found 5 days ago
United
Wed, 6 Aug - Wed, 17 Sep
LHR
London
SEA
Seattle
€616 Return, found 6 days ago
€616
Return
found 6 days ago
Select United flight, departing Wed, 6 Aug from London to Seattle, returning Wed, 17 Sep, priced at €616 found 6 days ago
Air Canada
Fri, 28 Nov - Fri, 5 Dec
LHR
London
SEA
Seattle
€618 Return, found 7 hours ago
€618
Return
found 7 hours ago
Select Air Canada flight, departing Fri, 28 Nov from London to Seattle, returning Fri, 5 Dec, priced at €618 found 7 hours ago
Brussels Airlines
Sat, 18 Oct - Wed, 29 Oct
LHR
London
SEA
Seattle
€624 Return, found 5 days ago
€624
Return
found 5 days ago
Select Brussels Airlines flight, departing Sat, 18 Oct from London to Seattle, returning Wed, 29 Oct, priced at €624 found 5 days ago
Austrian Airlines
Sat, 18 Oct - Wed, 29 Oct
LHR
London
SEA
Seattle
€624 Return, found 5 days ago
€624
Return
found 5 days ago
Select Austrian Airlines flight, departing Sat, 18 Oct from London to Seattle, returning Wed, 29 Oct, priced at €624 found 5 days ago
Virgin Atlantic
Mon, 1 Sep - Mon, 15 Sep
LHR
London
SEA
Seattle
€642 Return, found 5 days ago
€642
Return
found 5 days ago
Select Virgin Atlantic flight, departing Mon, 1 Sep from London to Seattle, returning Mon, 15 Sep, priced at €642 found 5 days ago
American Airlines
Wed, 22 Oct - Sun, 26 Oct
LHR
London
SEA
Seattle
€644 Return, found 10 hours ago
€644
Return
found 10 hours ago
Select American Airlines flight, departing Wed, 22 Oct from London to Seattle, returning Sun, 26 Oct, priced at €644 found 10 hours ago

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

February is typically the cheapest month to fly

From €420 - €837 per traveller.

Graph displaying average flight prices per month

0
London to Seattle route 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, JetBlue Airways, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines, Turkish Airlines, United, Virgin Atlantic, WestJet
Return price
€509
Distance
7657 km

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 Seattle, 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 €493 and roundtrip prices from €510. 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.
 
But the magic doesn't stop there. Expedia offers a range of partner services to enhance your trip. Rent a car at Seattle - Tacoma Intl. and explore Seattle and its surrounding areas at your own pace. Discover hidden gems off the beaten path, and create unforgettable memories. We also provide a handpicked selection of accommodations, from charming bed and breakfasts to luxury hotels, ensuring that you have a comfortable and memorable stay.
 
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 LHR to SEA travel arrangements today and embark on the journey of a lifetime in Seattle.

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 €510. 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.

Explore a world of travel with Expedia

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