Find cheap flights from Washington to London Heathrow Airport

LHR

Find cheap flights from Washington to London Heathrow Airport

Round-trip
Economy
Washington (WAS)
London Heathrow
Fri 7/10
Fri 7/17
Any month
Compare vs. KAYAK |
Search hundreds of travel sites at once for deals on flights to London Heathrow Airport

Good to know

Low season

October Best time to beat the crowds with an average 7% drop in price.

High season

June Most popular time to fly with an average 24% increase in price.

Average price of a round-trip

$1049 (avg. price over the last 2 weeks)

Good deal for a round-trip

$496 or less

FAQs for booking Washington to London Heathrow Airport flights

How does KAYAK’s flight Price Forecast tool help me choose the right time to buy?

Top 5 airlines serving Washington to London Heathrow

Scores according to KAYAK customer reviews

8.1
SWISS
Overall score based on 8,964 reviews
8.2
Boarding
7.9
Comfort
8.7
Crew
7.8
Entertainment
8.0
Food
Airline reviews
Read more about SWISS

Book cheap flights from Washington to London Heathrow Airport (round-trip)

Airports
Origin
Seattle
$429
only
$429
Pasco
$675
only
$675
Spokane
$650
only
$650
Destination
London
$429
only
$429
Tue, Sep 15
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Tue, Sep 29
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 15 days
Based on null reviews
Tue, Oct 6
GEG
Spokane Airport
LHR
London Heathrow Airport
15h 55m
Wed, Oct 21
LHR
London Heathrow Airport
GEG
Spokane Airport
18h 13m
Trip: 16 days
Based on null reviews
Tue, Oct 6
GEG
Spokane Airport
LHR
London Heathrow Airport
16h 12m
Wed, Oct 21
LHR
London Heathrow Airport
GEG
Spokane Airport
15h 05m
Trip: 16 days
Based on null reviews
Thu, Oct 8
PSC
Pasco Tri Cities
LHR
London Heathrow Airport
16h 16m
Thu, Oct 15
LHR
London Heathrow Airport
PSC
Pasco Tri Cities
18h 19m
Trip: 8 days
Based on null reviews
Thu, Oct 8
PSC
Pasco Tri Cities
LHR
London Heathrow Airport
18h 41m
Thu, Oct 15
LHR
London Heathrow Airport
PSC
Pasco Tri Cities
20h 00m
Trip: 8 days
Based on null reviews
Tue, Oct 6
GEG
Spokane Airport
LHR
London Heathrow Airport
34h 15m
Wed, Oct 21
LHR
London Heathrow Airport
GEG
Spokane Airport
21h 16m
Trip: 16 days
Based on null reviews
Tue, Oct 6
GEG
Spokane Airport
LHR
London Heathrow Airport
15h 55m
Wed, Oct 21
LHR
London Heathrow Airport
GEG
Spokane Airport
15h 05m
Trip: 16 days
Based on null reviews
Tue, Oct 6
GEG
Spokane Airport
LHR
London Heathrow Airport
34h 15m
Wed, Oct 21
LHR
London Heathrow Airport
GEG
Spokane Airport
30h 36m
Trip: 16 days
Based on null reviews
Mon, Sep 14
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
20h 30m
Fri, Sep 18
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
13h 00m
Trip: 5 days
Based on null reviews
Wed, Sep 16
GEG
Spokane Airport
LHR
London Heathrow Airport
15h 15m
Wed, Sep 23
LHR
London Heathrow Airport
GEG
Spokane Airport
30h 36m
Trip: 8 days
Based on null reviews
Tue, Oct 6
GEG
Spokane Airport
LHR
London Heathrow Airport
21h 02m
Wed, Oct 21
LHR
London Heathrow Airport
GEG
Spokane Airport
16h 14m
Trip: 16 days
Based on null reviews
Tue, Oct 6
GEG
Spokane Airport
LHR
London Heathrow Airport
18h 10m
Wed, Oct 21
LHR
London Heathrow Airport
GEG
Spokane Airport
19h 24m
Trip: 16 days
Based on null reviews
Wed, Sep 16
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
20h 30m
Wed, Sep 23
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 8 days
Based on null reviews
Wed, Sep 16
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
20h 30m
Mon, Sep 21
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
28h 30m
Trip: 6 days
Based on null reviews
Tue, Dec 8
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
12h 20m
Tue, Dec 15
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 45m
Trip: 8 days
Based on null reviews
Tue, Sep 22
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Tue, Oct 6
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 15 days
Based on null reviews
Thu, Oct 8
PSC
Pasco Tri Cities
LHR
London Heathrow Airport
16h 16m
Thu, Oct 15
LHR
London Heathrow Airport
PSC
Pasco Tri Cities
21h 54m
Trip: 8 days
Based on null reviews
Wed, Sep 16
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Wed, Sep 30
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
28h 30m
Trip: 15 days
Based on null reviews
Tue, Sep 15
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Tue, Sep 22
LHR
London Heathrow Airport
SEA
Seattle/Tacoma Airport
12h 50m
Trip: 8 days
Based on null reviews
Tue, Oct 6
GEG
Spokane Airport
LHR
London Heathrow Airport
26h 31m
Wed, Oct 21
LHR
London Heathrow Airport
GEG
Spokane Airport
20h 32m
Trip: 16 days
Based on null reviews

Book cheap flights from Washington to London Heathrow Airport (one-way)

Airports
Origin
Seattle
$230
only
$230
Destination
London
$230
only
$230
Tue, Sep 8
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
55h 20m
Based on null reviews
Thu, Aug 27
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
14h 05m
Based on null reviews
Mon, Aug 24
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Based on null reviews
Thu, Sep 3
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
26h 33m
Based on null reviews
Tue, Jul 28
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
9h 20m
Based on null reviews
Mon, Aug 10
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
12h 25m
Based on null reviews
Mon, Aug 10
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
14h 16m
Based on null reviews
Wed, Sep 2
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
43h 50m
Based on null reviews
Thu, Aug 27
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Based on null reviews
Wed, Sep 9
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
47h 38m
Based on null reviews
Mon, Jul 20
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Based on null reviews
Thu, Sep 3
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
36h 35m
Based on null reviews
Sun, Jul 12
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Based on null reviews
Sun, Sep 6
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
38h 45m
Based on null reviews
Wed, Aug 19
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
9h 20m
Based on null reviews
Mon, Jul 20
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
18h 00m
Based on null reviews
Tue, Sep 1
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
13h 30m
Based on null reviews
Mon, Sep 7
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
11h 55m
Based on null reviews
Sat, Aug 22
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
34h 30m
Based on null reviews
Mon, Aug 10
SEA
Seattle/Tacoma Airport
LHR
London Heathrow Airport
17h 15m
Based on null reviews
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

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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