Find Deals on Flights from London to Seattle

Depart
Return
1 adult
Adults
18-64
Seniors
65+
Youths
12-17
Children
2-11
Seat Infants
under 2
Lap Infants
under 2
The price shown for each flight will be the average for all passengers including any infants.
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Dates flexible? Here are the best fares found in the past 48 hours...

Book cheap flights from London to Seattle

(Round-trip)
Depart: Tue Mar 14 2017 Return: Tue Mar 28 2017 Trip spans 15 days
Icelandair
Icelandair
LHR
SEA
28h 05m
1 stop
SEA
LHR
11h 15m
1 stop
Depart: Thu Mar 16 2017 Return: Thu Mar 23 2017 Trip spans 8 days
Lufthansa
Lufthansa
LCY
SEA
25h 35m
1 stop
SEA
LCY
18h 35m
1 stop
Depart: Fri May 26 2017 Return: Sun Jun 4 2017 Trip spans 10 days
British Airways
British Airways
LHR
SEA
9h 55m
nonstop
SEA
LHR
9h 30m
nonstop
Depart: Tue Apr 25 2017 Return: Tue May 9 2017 Trip spans 15 days
SWISS
SWISS
LCY
SEA
21h 32m
2 stops
SEA
LCY
20h 40m
1 stop
Depart: Fri Jun 9 2017 Return: Wed Jun 14 2017 Trip spans 6 days
KLM
KLM
LCY
SEA
14h 20m
1 stop
SEA
LCY
15h 14m
1 stop
Depart: Fri Mar 3 2017 Return: Sun Mar 12 2017 Trip spans 10 days
Virgin Atlantic
Virgin Atlantic
LHR
SEA
10h 26m
nonstop
SEA
LHR
9h 58m
nonstop
Depart: Sun Aug 27 2017 Return: Sun Sep 10 2017 Trip spans 15 days
Icelandair
Icelandair
LGW
SEA
30h 05m
1 stop
SEA
LGW
11h 15m
1 stop
Depart: Sat Aug 26 2017 Return: Fri Sep 8 2017 Trip spans 14 days
British Airways
British Airways
LHR
SEA
9h 55m
nonstop
SEA
LHR
17h 26m
1 stop
Depart: Wed Aug 23 2017 Return: Wed Sep 6 2017 Trip spans 15 days
Icelandair
Icelandair
LHR
SEA
30h 05m
1 stop
SEA
LHR
18h 30m
1 stop
Depart: Wed Aug 16 2017 Return: Wed Aug 23 2017 Trip spans 8 days
Lufthansa
Lufthansa
LCY
SEA
34h 40m
1 stop
SEA
LCY
20h 40m
1 stop
Depart: Fri May 26 2017 Return: Sun Jun 4 2017 Trip spans 10 days
KLM
KLM
LCY
SEA
14h 00m
1 stop
SEA
LCY
15h 14m
1 stop
Depart: Wed Jun 21 2017 Return: Tue Jul 4 2017 Trip spans 14 days
Icelandair
Icelandair
LGW
SEA
30h 20m
1 stop
SEA
LGW
11h 35m
1 stop
Depart: Mon May 22 2017 Return: Fri Jun 9 2017 Trip spans 19 days
KLM
KLM
LCY
SEA
14h 00m
1 stop
SEA
LCY
14h 03m
1 stop
Depart: Mon Aug 7 2017 Return: Thu Aug 24 2017 Trip spans 18 days
Virgin Atlantic
Virgin Atlantic
LHR
SEA
9h 40m
nonstop
SEA
LHR
9h 00m
nonstop
Depart: Wed Jun 14 2017 Return: Thu Jun 22 2017 Trip spans 9 days
Lufthansa
Lufthansa
LCY
SEA
18h 46m
2 stops
SEA
LCY
20h 20m
2 stops
Depart: Mon Jun 5 2017 Return: Mon Jun 19 2017 Trip spans 15 days
Icelandair
Icelandair
LHR
SEA
29h 05m
1 stop
SEA
LHR
19h 40m
1 stop
Depart: Tue Apr 25 2017 Return: Tue May 9 2017 Trip spans 15 days
British Airways
British Airways
LHR
SEA
9h 40m
nonstop
SEA
LHR
9h 10m
nonstop
Depart: Wed Jun 21 2017 Return: Wed Aug 2 2017 Trip spans 43 days
Icelandair
Icelandair
LGW
SEA
30h 20m
1 stop
SEA
LGW
18h 30m
1 stop
Depart: Tue Feb 28 2017 Return: Thu Mar 9 2017 Trip spans 10 days
$1105
Select
SWISS
SWISS
LCY
SEA
19h 05m
2 stops
SEA
LCY
18h 35m
2 stops
Depart: Mon Apr 3 2017 Return: Thu Apr 20 2017 Trip spans 18 days
Lufthansa
Lufthansa
LCY
SEA
24h 35m
1 stop
SEA
LCY
18h 20m
1 stop
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

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Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

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Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
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Airports
Origin

London
only $596
only $726
only $682
Destination

Seattle
$596
Airlines Airline reviews

78 travelers who booked a flight from London to Seattle rated their chosen airlines with an average of 7.7.

Overall
7.8
Boarding
7.6
Crew
8.4
Comfort
7.1
Food
7.5
Entertainment
7.6