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

View AU$356 flight on Wed, 30 Jul. 2025Opens in a new window

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

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

Icelandair
Sat., 10 May - Tue., 27 May
SEA
Seattle
LHR
London
AU$929 Return, found 5 days ago
AU$929
Return
found 5 days ago
Select Icelandair flight, departing Sat., 10 May from Seattle to London, returning Tue., 27 May, priced at AU$929 found 5 days ago
Icelandair
Fri., 9 May - Fri., 16 May
SEA
Seattle
LGW
London
AU$950 Return, found 2 days ago
AU$950
Return
found 2 days ago
Select Icelandair flight, departing Fri., 9 May from Seattle to London, returning Fri., 16 May, priced at AU$950 found 2 days ago
Lufthansa
Tue., 22 Apr. - Wed., 30 Apr.
SEA
Seattle
LHR
London
AU$1,050 Return, found 5 days ago
AU$1,050
Return
found 5 days ago
Select Lufthansa flight, departing Tue., 22 Apr. from Seattle to London, returning Wed., 30 Apr., priced at AU$1,050 found 5 days ago
Air Canada
Thu., 24 Apr. - Thu., 1 May
SEA
Seattle
LHR
London
AU$1,093 Return, found 5 days ago
AU$1,093
Return
found 5 days ago
Select Air Canada flight, departing Thu., 24 Apr. from Seattle to London, returning Thu., 1 May, priced at AU$1,093 found 5 days ago
American Airlines
Wed., 16 Apr. - Mon., 28 Apr.
SEA
Seattle
LHR
London
AU$1,298 Return, found 5 days ago
AU$1,298
Return
found 5 days ago
Select American Airlines flight, departing Wed., 16 Apr. from Seattle to London, returning Mon., 28 Apr., priced at AU$1,298 found 5 days ago
Turkish Airlines
Fri., 9 May - Fri., 16 May
SEA
Seattle
LGW
London
AU$1,329 Return, found 2 days ago
AU$1,329
Return
found 2 days ago
Select Turkish Airlines flight, departing Fri., 9 May from Seattle to London, returning Fri., 16 May, priced at AU$1,329 found 2 days ago
Delta
Sun., 11 May - Sun., 18 May
SEA
Seattle
LHR
London
AU$1,339 Return, found 21 hours ago
AU$1,339
Return
found 21 hours ago
Select Delta flight, departing Sun., 11 May from Seattle to London, returning Sun., 18 May, priced at AU$1,339 found 21 hours ago
Aer Lingus
Wed., 16 Apr. - Mon., 28 Apr.
SEA
Seattle
LHR
London
AU$1,345 Return, found 5 days ago
AU$1,345
Return
found 5 days ago
Select Aer Lingus flight, departing Wed., 16 Apr. from Seattle to London, returning Mon., 28 Apr., priced at AU$1,345 found 5 days ago
Virgin Atlantic
Sun., 11 May - Sun., 18 May
SEA
Seattle
LHR
London
AU$1,362 Return, found 21 hours ago
AU$1,362
Return
found 21 hours ago
Select Virgin Atlantic flight, departing Sun., 11 May from Seattle to London, returning Sun., 18 May, priced at AU$1,362 found 21 hours ago
Austrian Airlines
Mon., 21 Apr. - Wed., 30 Apr.
SEA
Seattle
LHR
London
AU$1,369 Return, found 5 days ago
AU$1,369
Return
found 5 days ago
Select Austrian Airlines flight, departing Mon., 21 Apr. from Seattle to London, returning Wed., 30 Apr., priced at AU$1,369 found 5 days ago
Flight from Seattle to London route information
Origin airport
Seattle - Tacoma Intl.
Destination airport
Heathrow
Return price
AU$928
Distance
7657 km

Your quick guide to flights from Seattle to London

Pick up great flights from Seattle to London

With Expedia, you have your pick of flights a day with 20 airlines covering flights from Seattle to London. Whether you’re on a business trip, a family holiday or a luxury break, just enter your travel dates, hit search then check out your choice of flights. Select from return, one way or multi-city flights, and use the advance search tool if you want a direct or refundable flight. You can narrow your search to show you just your preferred cabin class and airline, too. It’s all easy. You can book direct flights from Seattle to London that take around hours.

Find cheap flights from Seattle to London

From the great flight deals with prices currently ranging from AU$929 to AU$1,369, you can choose to see the cheapest flights first. Generally, you can book the cheapest flights from Seattle to London around 4 to 6 weeks in advance. If your travel dates are flexible, try to avoid weekends and peak seasons – when you are more likely to grab the lowest prices. Even last minute, there are some impressive deals. The cheapest time to fly to London is normally in May.

Reasons to book your flight from Seattle to London with Expedia

Expedia makes it easy to find, book, and travel, with everything you need all in one place. When you enter your travel details, find fantastic deals just for you on flight tickets from Seattle to London across all the main airline carriers, so you can save time, dollars, and hassle finding the perfect flight. If you think your plans could change, choose refundable flights so any changes won’t cost you more. Book your flight to London right now and, if you join Expedia Rewards, you earn points this time and every time you travel with Expedia.

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 AU$929. 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 cancelled 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 kilometres 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 Flight Deals

London

Seattle to Heathrow
AU$928.50
*Available to Expedia members.