Flights from Seattle Tacoma to London Heathrow

Our cheapest offers for flights from Seattle Tacoma to London Heathrow

Here you can compare cheap flights from Seattle Tacoma (SEA) to London Heathrow (LHR) 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 Heathrow. Prices and availability may change at any time.

Outbound Return Airlines Shop Baggage Price
Best option
Seattle-Tacoma
London Heathrow
Outbound
04/26/25
1 Stopover (KEF)
FI0682, FI0454
17h 20min
Return
05/23/25
1 Stopover (KEF)
FI0451, FI0683
15h 35min
Icelandair
$621
Seattle-Tacoma
London Heathrow
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 Heathrow
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 Heathrow
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 Heathrow
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 Heathrow
Outbound
04/26/25
1 Stopover (KEF)
FI0682, FI0454
17h 20min
Return
05/23/25
1 Stopover (KEF)
FI0451, FI0681
12h 45min
Icelandair ?
$647
Seattle-Tacoma
London Heathrow
Outbound
04/26/25
1 Stopover (KEF)
FI0682, FI0454
17h 20min
Return
05/23/25
1 Stopover (KEF)
FI0451, FI0683
15h 35min
Icelandair ?
$655
Seattle-Tacoma
London Heathrow
Outbound
04/26/25
1 Stopover (KEF)
FI0682, FI0454
17h 20min
Return
05/23/25
1 Stopover (KEF)
FI0451, FI0683
15h 35min
Icelandair
$659
Seattle-Tacoma
London Heathrow
Outbound
04/26/25
1 Stopover (KEF)
FI0682, FI0454
17h 20min
Return
05/23/25
1 Stopover (KEF)
FI0451, FI0683
15h 35min
Icelandair ?
$669
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 Heathrow

Favorite airline: Icelandair
The majority of passengers on the route Seattle-Tacoma – London Heathrow prefer to fly with Icelandair.
Icelandair
39 %
Virgin Atlantic
23 %
Air Canada
14 %
Direct flights are more expensive
Flights with a stopover are on average $138.00 cheaper than direct flights.
non stop flight
1 stop
2 stops
09h 20min
19h 55min
20h 00min
$601
$463
$1,060
Favourite connection: via Reykjavik-Keflavik
54 % of booked tickets on this route are for flights with a transfer in Reykjavik-Keflavik.
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 Heathrow

Roundtrip from $620.37
Flight duration min. 09:20 / max. 09:30
Return flight duration min. 09:50/ max. 09:55
Distance 7710 km
Flights per week 19
Departure airport Airport Seattle-Tacoma International Airport, WA (SEA)
Arrival airport Airport London Heathrow (LHR)
Destination country Flights to United Kingdom
Alternative routes to United Kingdom
Alternative flights to London Heathrow
Flight destinations with a similar price
Flight destinations with a similar price