Flights from Seattle Tacoma to London

Our cheapest offers for flights from Seattle Tacoma to London

Here you can compare cheap flights from Seattle Tacoma (SEA) to London (LON) for one-way or return trips. The following offers were searched for and found on idealo during the last few days. Or start your own flight search to London. Prices and availability may change at any time.

Outbound Return Airlines Shop Baggage Price
Seattle-Tacoma
London
Outbound
04/26/25
1 Stopover (KEF)
FI0682, FI0454
17h 20min
Return
05/23/25
1 Stopover (KEF)
FI0451, FI0683
15h 35min
Icelandair
$621
Best option
Seattle-Tacoma
London
Outbound
04/12/25
direct
IB3506
09h 20min
Return
04/27/25
direct
IB3509
09h 45min
Iberia
$1,102
Seattle-Tacoma
London
Outbound
04/26/25
2 Stopovers (SFO, FRA)
AS1166, DE2097, LH0914
24h 35min
Return
05/23/25
1 Stopover (FRA)
LH0923, DE2032
13h 35min
Alaska Airlines, Condor, Lufthansa
$1,201
Seattle-Tacoma
London
Outbound
04/26/25
1 Stopover (KEF)
FI0682, FI0454
17h 20min
Return
05/23/25
1 Stopover (KEF)
FI0451, FI0683
15h 35min
Icelandair ?
$624
Seattle-Tacoma
London
Outbound
04/26/25
1 Stopover (KEF)
FI0682, FI0454
17h 20min
Return
05/23/25
1 Stopover (KEF)
FI0451, FI0683
15h 35min
Icelandair
$625
Seattle-Tacoma
London
Outbound
04/12/25
1 Stopover (IAH)
UA2379, UA0880
23h 41min
Return
04/27/25
1 Stopover (YVR)
UA8581, UA8249
12h 18min
United Airlines ?
$634
Seattle-Tacoma
London
Outbound
04/12/25
2 Stopovers (YVR, YYC)
AC8811, AC0200, AC0850
32h 45min
Return
04/27/25
1 Stopover (YVR)
LH6812, LH6564
15h 53min
Air Canada
$636
Seattle-Tacoma
London
Outbound
04/12/25
2 Stopovers (YVR, YYC)
AC8811, AC0200, AC0850
32h 45min
Return
04/27/25
1 Stopover (YVR)
LH6812, LH6564
15h 53min
Air Canada
$638
Seattle-Tacoma
London
Outbound
04/26/25
1 Stopover (KEF)
FI0682, FI0454
17h 20min
Return
05/23/25
1 Stopover (KEF)
FI0451, FI0683
15h 35min
Icelandair ?
$640
Seattle-Tacoma
London
Outbound
04/26/25
1 Stopover (KEF)
FI0682, FI0454
17h 20min
Return
05/23/25
1 Stopover (KEF)
FI0451, FI0681
12h 45min
Icelandair ?
$647
Prices based on recent searches, subject to last-minute changes
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Tips and tricks to help you find cheap flights from Seattle Tacoma to London

Favorite airline: Icelandair
76 % of flights booked on the route from Seattle-Tacoma to London are booked with Icelandair, Virgin Atlantic and Air Canada.
Icelandair
39 %
Virgin Atlantic
23 %
Air Canada
14 %
Direct flights are more expensive
Direct flights on this route are $138.00 more expensive on average than flights with a stopover.
non stop flight
1 stop
2 stops
09h 20min
19h 55min
20h 00min
$601
$463
$1,060
Favourite connection: via Reykjavik-Keflavik
The most popular route is via Reykjavik-Keflavik and is booked by 54 % of all travelers.
Route
bookings
1 stopover Reykjavik-Keflavik International
19h 55min, from $463
54 %
Direct flights
09h 20min, from $601
22 %
1 stopover Dublin
13h 45min, from $600
10 %

Important flight information

Flight information: Seattle-Tacoma - London

Roundtrip from $620.37
Flight duration min. 09:20 / max. 09:30
Return flight duration min. 09:50/ max. 09:55
Distance 7721 km
Flights per week 19
Departure airport Airport Seattle-Tacoma International Airport, WA (SEA)
Arrival airport Airport London, all Airports (LCY, LGW, LHR, LTN, STN, SEN) (LON)
Destination country Flights to United Kingdom
Alternative routes to United Kingdom
Alternative flights to London
Flight destinations with a similar price
Flight destinations with a similar price