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
09/19/25
1 Stopover (KEF)
FI0680, FI0450
12h 10min
Return
09/29/25
1 Stopover (KEF)
FI0455, FI0683
31h 15min
Icelandair
$502
Best option
Seattle-Tacoma
London
Outbound
07/25/25
direct
IB3506
09h 20min
Return
08/17/25
direct
IB3507
09h 50min
Iberia
$689
Seattle-Tacoma
London
Outbound
09/04/25
2 Stopovers (LAX, FRA)
AS1144, DE2081, LH0914
20h 40min
Return
09/28/25
1 Stopover (FRA)
LH0925, DE2032
14h 35min
Alaska Airlines, Condor, Lufthansa
$1,026
Seattle-Tacoma
London
Outbound
09/19/25
1 Stopover (KEF)
FI0680, FI0450
12h 10min
Return
09/29/25
1 Stopover (KEF)
FI0455, FI0683
31h 15min
Icelandair
$504
Seattle-Tacoma
London
Outbound
09/19/25
1 Stopover (KEF)
FI0680, FI0450
12h 10min
Return
09/29/25
1 Stopover (KEF)
FI0455, FI0683
31h 15min
Icelandair ?
$511
Seattle-Tacoma
London
Outbound
09/19/25
1 Stopover (KEF)
FI0680, FI0450
12h 10min
Return
09/29/25
1 Stopover (KEF)
FI0455, FI0683
31h 15min
Icelandair ?
$530
Seattle-Tacoma
London
Outbound
09/19/25
1 Stopover (KEF)
FI0680, FI0450
12h 10min
Return
09/29/25
1 Stopover (KEF)
FI0455, FI0683
31h 15min
Icelandair ?
$536
Seattle-Tacoma
London
Outbound
09/04/25
1 Stopover (KEF)
FI0684, FI0454
12h 50min
Return
09/28/25
1 Stopover (KEF)
FI0455, FI0683
31h 15min
Icelandair ?
$599
Seattle-Tacoma
London
Outbound
09/19/25
2 Stopovers (YVR, YUL)
AC8803, AC0308, AC0864
16h 00min
Return
09/29/25
1 Stopover (YUL)
AC0867, AC0515
18h 01min
Air Canada ?
$637
Seattle-Tacoma
London
Outbound
09/04/25
1 Stopover (KEF)
FI0682, FI0454
17h 20min
Return
09/28/25
1 Stopover (KEF)
FI0451, FI0681
12h 45min
Icelandair
$653
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 $501.93
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