Find Cheap Flights to London Heathrow

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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Book cheap flights to London Heathrow

(Round-trip)
Depart: Tue Oct 31 2017 Return: Thu Nov 9 2017 Trip spans 10 days
Major Airline
Major Airline
SEA
LHR
11h 45m
1 stop
LHR
SEA
12h 00m
1 stop
Depart: Mon Sep 11 2017 Return: Thu Sep 21 2017 Trip spans 11 days
British Airways
British Airways
LAX
LHR
10h 30m
nonstop
LHR
LAX
11h 25m
nonstop
Depart: Mon Oct 2 2017 Return: Wed Oct 11 2017 Trip spans 10 days
TAP Portugal
TAP Portugal
MIA
LHR
13h 05m
1 stop
LHR
MIA
13h 30m
1 stop
Depart: Wed Oct 4 2017 Return: Fri Oct 13 2017 Trip spans 10 days
Finnair
Finnair
LAX
LHR
10h 35m
nonstop
LHR
LAX
11h 15m
nonstop
Depart: Mon Sep 11 2017 Return: Tue Oct 10 2017 Trip spans 30 days
American Airlines
American Airlines
ONT
LHR
13h 05m
1 stop
LHR
ONT
14h 59m
1 stop
Depart: Fri May 5 2017 Return: Sun May 7 2017 Trip spans 3 days
Aer Lingus
Aer Lingus
JFK
LHR
19h 00m
1 stop
LHR
JFK
11h 00m
1 stop
Depart: Sun Jul 30 2017 Return: Tue Aug 8 2017 Trip spans 10 days
Icelandair
Icelandair
BOS
LHR
18h 25m
1 stop
LHR
BOS
26h 25m
1 stop
Depart: Sun Apr 30 2017 Return: Wed May 10 2017 Trip spans 11 days
Iberia
Iberia
LAX
LHR
10h 45m
nonstop
LHR
LAX
17h 45m
1 stop
Depart: Fri Jun 9 2017 Return: Sun Jun 11 2017 Trip spans 3 days
Turkish Airlines
Turkish Airlines
BOS
LHR
16h 10m
1 stop
LHR
BOS
16h 30m
1 stop
Depart: Mon Aug 21 2017 Return: Mon Sep 11 2017 Trip spans 22 days
Air India
Air India
EWR
LHR
6h 45m
nonstop
LHR
EWR
7h 30m
nonstop
Depart: Wed Sep 20 2017 Return: Wed Oct 18 2017 Trip spans 29 days
Virgin Atlantic
Virgin Atlantic
SEA
LHR
9h 00m
nonstop
LHR
SEA
9h 40m
nonstop
Depart: Fri Aug 25 2017 Return: Mon Aug 28 2017 Trip spans 4 days
SAS
SAS
MIA
LHR
14h 35m
1 stop
LHR
MIA
23h 30m
1 stop
Depart: Wed Sep 13 2017 Return: Fri Sep 22 2017 Trip spans 10 days
Air Canada
Air Canada
LGA
LHR
10h 45m
1 stop
LHR
LGA
10h 08m
1 stop
Depart: Wed Sep 20 2017 Return: Thu Sep 28 2017 Trip spans 9 days
United
United
SFO
LHR
20h 25m
1 stop
LHR
SFO
15h 20m
1 stop
Depart: Sun Sep 17 2017 Return: Mon Sep 25 2017 Trip spans 9 days
Delta
Delta
OAK
LHR
22h 55m
1 stop
LHR
OAK
14h 55m
1 stop
Depart: Tue May 9 2017 Return: Fri May 12 2017 Trip spans 4 days
Royal Air Maroc
Royal Air Maroc
IAD
LHR
13h 50m
1 stop
LHR
IAD
31h 05m
1 stop
Depart: Mon Jun 19 2017 Return: Tue Jul 4 2017 Trip spans 16 days
Austrian Airlines
Austrian Airlines
EWR
LHR
7h 10m
nonstop
LHR
EWR
7h 55m
nonstop
Depart: Mon Sep 11 2017 Return: Sat Sep 23 2017 Trip spans 13 days
KLM
KLM
ONT
LHR
21h 50m
2 stops
LHR
ONT
18h 32m
2 stops
Depart: Thu May 11 2017 Return: Mon May 15 2017 Trip spans 5 days
Condor
Condor
MSP
LHR
12h 30m
1 stop
LHR
MSP
14h 15m
1 stop
Depart: Sat Jun 3 2017 Return: Wed Jun 14 2017 Trip spans 12 days
Lufthansa
Lufthansa
IAD
LHR
7h 25m
nonstop
LHR
IAD
8h 20m
nonstop
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

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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.

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Airports
Origin

San Francisco
$627
New York
only $623
only $514
Seattle
$407
Minneapolis
$763
Los Angeles
$470
Newark
$560
Oakland
$644
Ontario
$506
Washington
$677
Miami
$481
Boston
$532
Destination

London
$407
Airlines Airline reviews

189 travelers who booked a flight from Seattle to London rated their chosen airlines with an average of 7.5.

Overall
7.6
Boarding
7.8
Crew
8.1
Comfort
7.1
Food
7.1
Entertainment
7.5