€343 Cheap Flights Seattle to London (SEA-LON)

View €343 flight on Sun, 8 Nov 2026Opens in a new window

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

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Cheap flights from Seattle to London (SEA-LON)

Prices were available within the past 7 days and start at €343 for one-way flights and €610 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Condor
Sun, 19 Apr - Fri, 24 Apr
SEA
Seattle
LGW
London
€610 Return, found 22 hours ago
€610
Return
found 22 hours ago
Select Condor flight, departing Sun, 19 Apr from Seattle to London, returning Fri, 24 Apr, priced at €610 found 22 hours ago
Icelandair
Sun, 3 May - Tue, 19 May
SEA
Seattle
LGW
London
€695 Return, found 2 days ago
€695
Return
found 2 days ago
Select Icelandair flight, departing Sun, 3 May from Seattle to London, returning Tue, 19 May, priced at €695 found 2 days ago
Icelandair
Sun, 3 May - Sun, 10 May
SEA
Seattle
LHR
London
€698 Return, found 3 days ago
€698
Return
found 3 days ago
Select Icelandair flight, departing Sun, 3 May from Seattle to London, returning Sun, 10 May, priced at €698 found 3 days ago
Turkish Airlines
Sun, 3 May - Sun, 10 May
SEA
Seattle
STN
London
€752 Return, found 3 days ago
€752
Return
found 3 days ago
Select Turkish Airlines flight, departing Sun, 3 May from Seattle to London, returning Sun, 10 May, priced at €752 found 3 days ago
Virgin Atlantic
Sun, 3 Jan - Tue, 19 Jan
SEA
Seattle
LHR
London
€787 Return, found 1 day ago
€787
Return
found 1 day ago
Select Virgin Atlantic flight, departing Sun, 3 Jan from Seattle to London, returning Tue, 19 Jan, priced at €787 found 1 day ago
Scandinavian Airlines
Sun, 31 May - Tue, 16 Jun
SEA
Seattle
LHR
London
€797 Return, found 1 day ago
€797
Return
found 1 day ago
Select Scandinavian Airlines flight, departing Sun, 31 May from Seattle to London, returning Tue, 16 Jun, priced at €797 found 1 day ago
Lufthansa
Sun, 3 Jan - Tue, 19 Jan
SEA
Seattle
LHR
London
€798 Return, found 1 day ago
€798
Return
found 1 day ago
Select Lufthansa flight, departing Sun, 3 Jan from Seattle to London, returning Tue, 19 Jan, priced at €798 found 1 day ago
Finnair
Sun, 3 Jan - Tue, 19 Jan
SEA
Seattle
LHR
London
€805 Return, found 1 day ago
€805
Return
found 1 day ago
Select Finnair flight, departing Sun, 3 Jan from Seattle to London, returning Tue, 19 Jan, priced at €805 found 1 day ago
Iberia
Sun, 3 Jan - Tue, 19 Jan
SEA
Seattle
LHR
London
€805 Return, found 1 day ago
€805
Return
found 1 day ago
Select Iberia flight, departing Sun, 3 Jan from Seattle to London, returning Tue, 19 Jan, priced at €805 found 1 day ago
British Airways
Sun, 3 Jan - Tue, 19 Jan
SEA
Seattle
LHR
London
€805 Return, found 1 day ago
€805
Return
found 1 day ago
Select British Airways flight, departing Sun, 3 Jan from Seattle to London, returning Tue, 19 Jan, priced at €805 found 1 day ago

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

April is typically the cheapest month to fly

From €514 - €977 per traveller.

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 €610. 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.

Travel information

Origin airport
Seattle - Tacoma Intl.
Destination airport
Gatwick
Return price
€610
Distance
7697 km

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