CA $357 Cheap Flights from Seattle (SEA) to London (LON)

View CA $357 flight on Thu, Oct. 16, 2025Opens in a new window

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

  • Plan, book, fly with confidence

  • trending down icon
    Be in the know
    Get alerts if flight prices drop or rise*
  • bex rewards loyalty icon
    Book smarter
    Save up to 30% on select hotels after you book a flight*
  • payments icon
    Earn twice
    Earn your airline miles on top of our rewards
    Sign in

Cheap flights from Seattle (SEA) to London (LON)

Prices were available within the past 7 days and start at CA $357 for one-way flights and CA $635 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Scandinavian Airlines
Mon., Aug. 25 - Tue., Sep. 2
SEA
Seattle
LHR
London
CA $635 Roundtrip, found 3 hours ago
CA $635
Roundtrip
found 3 hours ago
Select Scandinavian Airlines flight, departing Mon., Aug. 25 from Seattle to London, returning Tue., Sep. 2, priced at CA $635 found 3 hours ago
JetBlue Airways
Wed., Apr. 30 - Wed., May 7
SEA
Seattle
LHR
London
CA $789 Roundtrip, found 6 days ago
CA $789
Roundtrip
found 6 days ago
Select JetBlue Airways flight, departing Wed., Apr. 30 from Seattle to London, returning Wed., May 7, priced at CA $789 found 6 days ago
Virgin Atlantic
Sun., Sep. 7 - Tue., Sep. 30
SEA
Seattle
LHR
London
CA $798 Roundtrip, found 6 days ago
CA $798
Roundtrip
found 6 days ago
Select Virgin Atlantic flight, departing Sun., Sep. 7 from Seattle to London, returning Tue., Sep. 30, priced at CA $798 found 6 days ago
Delta
Sun., Sep. 7 - Tue., Sep. 30
SEA
Seattle
LHR
London
CA $798 Roundtrip, found 6 days ago
CA $798
Roundtrip
found 6 days ago
Select Delta flight, departing Sun., Sep. 7 from Seattle to London, returning Tue., Sep. 30, priced at CA $798 found 6 days ago
American Airlines
Sun., Sep. 7 - Tue., Sep. 30
SEA
Seattle
LHR
London
CA $808 Roundtrip, found 6 days ago
CA $808
Roundtrip
found 6 days ago
Select American Airlines flight, departing Sun., Sep. 7 from Seattle to London, returning Tue., Sep. 30, priced at CA $808 found 6 days ago
Air Canada
Sun., Sep. 7 - Tue., Sep. 30
SEA
Seattle
LHR
London
CA $808 Roundtrip, found 6 days ago
CA $808
Roundtrip
found 6 days ago
Select Air Canada flight, departing Sun., Sep. 7 from Seattle to London, returning Tue., Sep. 30, priced at CA $808 found 6 days ago
Lufthansa
Sun., Sep. 7 - Tue., Sep. 30
SEA
Seattle
LHR
London
CA $823 Roundtrip, found 6 days ago
CA $823
Roundtrip
found 6 days ago
Select Lufthansa flight, departing Sun., Sep. 7 from Seattle to London, returning Tue., Sep. 30, priced at CA $823 found 6 days ago
Icelandair
Fri., May 2 - Tue., May 6
SEA
Seattle
LGW
London
CA $860 Roundtrip, found 6 days ago
CA $860
Roundtrip
found 6 days ago
Select Icelandair flight, departing Fri., May 2 from Seattle to London, returning Tue., May 6, priced at CA $860 found 6 days ago
Swiss International Air Lines
Sun., Sep. 7 - Tue., Sep. 30
SEA
Seattle
LHR
London
CA $870 Roundtrip, found 6 days ago
CA $870
Roundtrip
found 6 days ago
Select Swiss International Air Lines flight, departing Sun., Sep. 7 from Seattle to London, returning Tue., Sep. 30, priced at CA $870 found 6 days ago
Aer Lingus
Sun., Aug. 10 - Wed., Aug. 20
SEA
Seattle
LHR
London
CA $923 Roundtrip, found 2 days ago
CA $923
Roundtrip
found 2 days ago
Select Aer Lingus flight, departing Sun., Aug. 10 from Seattle to London, returning Wed., Aug. 20, priced at CA $923 found 2 days ago
Flight from Seattle to London (SEA - LHR) route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Heathrow
Roundtrip price
CA $635
Distance
7657 km

Seattle to England Flights

Ready for an adventure? Thought so! Prepare to see the sights when you book your trip from Seattle to England 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 SEA to LON 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 Seattle to England 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 SEA to LON. 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 England 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 Sea-Tac Airport to London (LON-All Airports)?
Round-trip journeys from Seattle - Tacoma Intl. Airport (SEA) to London (LON-All Airports) start from CA $635. This is based on fares offered within the last 7 days on Expedia for flights departing within the next year — book now so you don’t miss out. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from SEA to London (LON-All Airports)?
Most flights can be canceled online, but each air carrier has its own terms and conditions. If you do decide to cancel your flight, visit our Customer Service Portal and follow the instructions.
How do I find cheap flights from SEA to London (LON-All Airports) 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 SEA to London (LON-All Airports) flights, you’ll see a “no change fees” filter for you to select.
How many hours is the flight from Seattle - Tacoma Intl. Airport (SEA) to London (LON-All Airports)?
Make the 14 hours and 48 minutes between SEA and London (LON-All Airports) as comfortable as you can. Bring the essentials, like a water bottle, toothbrush and toiletries, and simply enjoy the flight!
How far is the flight from SEA to London (LON-All Airports)?
With around 7,700 kilometers separating SEA and London (LON-All Airports), your flight will be a long one. Pack wisely and make your time on board comfortable. Simple things like an eye mask and a good travel pillow can make a massive difference.
Which airlines fly direct from Seattle - Tacoma Intl. Airport (SEA) to London (LON-All Airports)?
You have lots of options when flying from SEA to London (LON-All Airports). Lock in your fare with one of these popular airlines:

  • 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 Sea-Tac Airport to London (LON-All Airports) flight tickets cheaper when they're purchased at the last minute?
Booking last minute from SEA to London (LON-All Airports) can be hit-or-miss. It is possible to score a bargain, but you could also miss out entirely! If you’d prefer to play it safe and start planning early on, Expedia compares flight deals up to 12 months in advance. Just remember that not all airlines publish their prices that far in advance. Our suggestion? Check back often as updates are made regularly.

Explore a world of travel with Expedia

London nearby Airports

London

Seattle to Heathrow
CA $634.90
Seattle to Gatwick
CA $859.44
Seattle nearby Airports

Seattle Paine Field Intl. Airport

*Available to Expedia members.