CA $758 Cheap Flights from London (LHR) to Seattle (SEA)

View CA $758 flight on Mon, Sep. 8, 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 (LHR) to Seattle (SEA)

Prices were available within the past 7 days and start at CA $758 for one-way flights and CA $857 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Lufthansa
Tue., May 6 - Tue., May 13
LHR
London
SEA
Seattle
CA $857 Roundtrip, found 4 days ago
CA $857
Roundtrip
found 4 days ago
Select Lufthansa flight, departing Tue., May 6 from London to Seattle, returning Tue., May 13, priced at CA $857 found 4 days ago
Lufthansa
Tue., May 6 - Tue., May 13
LHR
London
SEA
Seattle
CA $868 Roundtrip, found 4 days ago
CA $868
Roundtrip
found 4 days ago
Select Lufthansa flight, departing Tue., May 6 from London to Seattle, returning Tue., May 13, priced at CA $868 found 4 days ago
Icelandair
Sat., Aug. 30 - Fri., Sep. 5
LHR
London
SEA
Seattle
CA $884 Roundtrip, found 3 days ago
CA $884
Roundtrip
found 3 days ago
Select Icelandair flight, departing Sat., Aug. 30 from London to Seattle, returning Fri., Sep. 5, priced at CA $884 found 3 days ago
Delta
Mon., Apr. 28 - Tue., May 13
LHR
London
SEA
Seattle
CA $904 Roundtrip, found 3 days ago
CA $904
Roundtrip
found 3 days ago
Select Delta flight, departing Mon., Apr. 28 from London to Seattle, returning Tue., May 13, priced at CA $904 found 3 days ago
British Airways
Tue., May 6 - Tue., May 13
LHR
London
SEA
Seattle
CA $910 Roundtrip, found 4 days ago
CA $910
Roundtrip
found 4 days ago
Select British Airways flight, departing Tue., May 6 from London to Seattle, returning Tue., May 13, priced at CA $910 found 4 days ago
Virgin Atlantic
Tue., May 6 - Tue., May 13
LHR
London
SEA
Seattle
CA $910 Roundtrip, found 4 days ago
CA $910
Roundtrip
found 4 days ago
Select Virgin Atlantic flight, departing Tue., May 6 from London to Seattle, returning Tue., May 13, priced at CA $910 found 4 days ago
Brussels Airlines
Fri., May 9 - Tue., May 13
LHR
London
SEA
Seattle
CA $911 Roundtrip, found 1 day ago
CA $911
Roundtrip
found 1 day ago
Select Brussels Airlines flight, departing Fri., May 9 from London to Seattle, returning Tue., May 13, priced at CA $911 found 1 day ago
Austrian Airlines
Fri., May 9 - Tue., May 13
LHR
London
SEA
Seattle
CA $911 Roundtrip, found 1 day ago
CA $911
Roundtrip
found 1 day ago
Select Austrian Airlines flight, departing Fri., May 9 from London to Seattle, returning Tue., May 13, priced at CA $911 found 1 day ago
Scandinavian Airlines
Mon., May 26 - Mon., Jun. 9
LHR
London
SEA
Seattle
CA $920 Roundtrip, found 5 days ago
CA $920
Roundtrip
found 5 days ago
Select Scandinavian Airlines flight, departing Mon., May 26 from London to Seattle, returning Mon., Jun. 9, priced at CA $920 found 5 days ago
American Airlines
Mon., Apr. 28 - Tue., May 13
LHR
London
SEA
Seattle
CA $929 Roundtrip, found 3 days ago
CA $929
Roundtrip
found 3 days ago
Select American Airlines flight, departing Mon., Apr. 28 from London to Seattle, returning Tue., May 13, priced at CA $929 found 3 days ago
Flight from London to Seattle (LHR - SEA) 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
Roundtrip price
CA $856
Distance
7657 km

London to Seattle Flights

Ready for an adventure? Thought so! Prepare to see the sights when you book your trip from London to Seattle with Expedia.ca. Whether you’re visiting for business or pleasure, we know how important it is to bring home travel stories. Maybe your tales will include the best dinner of your life, or the weirdest street art you saw in the city, or the concert that turned you into a fan of a new band. Whatever it is, your new favourite anecdote is right around the corner. Book your trip from LHR to SEA and begin your journey!

Getting a cheap deal on your trip sets the tone for the perfect holiday. And with Expedia.ca, you know you can travel from London to Seattle on the cheap, with enough money left over for a stellar time in the city. That could mean more tours with the kids, more concerts with the spouse, more dessert amongst co-workers, or even front row seats to a sports game if you’re travelling solo. It’s your holiday! Make it great.

Travelling shouldn’t cost an arm and a leg before you even get to relax on the plane’s armrests. Count on Expedia.ca to get you the best discounts on flights from LHR to SEA. And remember this: You can also save big when you bundle. Add a hotel or car rental deal to your flight and witness those savings add up. Hey, more money for more souvenirs, right? Right! Pack your bags and we’ll see you on the route.

Combine your Seattle flight with a hotel and/or car rental for a package deal designed to save you even more money! Discover additional savings by booking in advance or find a last minute deal. There are tons of ways to save on your flights from with Expedia Canada. Use us as your top travel destination and have the confidence that you’re getting a bargain!

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 CA $857. 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 canceled 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 kilometers 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.

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