How does KAYAK find such low prices on flights from Washington to London Heathrow Airport?

KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington to London Heathrow Airport.

How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to London Heathrow Airport?

KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Washington is likely to change within 7 days, so travelers know whether to wait or book now.

What is the Hacker Fare option on flights from Washington to London Heathrow Airport?

Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London Heathrow Airport with an airline and back to Washington with another airline.

What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington to London Heathrow Airport?

Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

$336 CHEAP FLIGHTS from Washington to London Heathrow (LHR)

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Cheap Flights from Washington to London

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Direct

Recent round-trip flight deals from Washington to London

Fri, Mar 26 - Sun, Apr 11

7:00 pm - 10:55 amSEA Seattle/Tacoma Intl-LHR London Heathrow

32h 55m1 stop Reykjavik Keflavik Intl

9:25 pm - 5:55 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 30m1 stop Reykjavik Keflavik Intl

$750Icelandair

Tue, Jan 12 - Wed, Jan 13

5:00 am - 6:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 20m2 stops Denver Intl Newark

9:00 am - 10:57 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

21h 57m2 stops Zurich San Francisco

$750United Airlines

Wed, Feb 17 - Wed, Feb 24

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

12:15 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

12h 45m1 stop Reykjavik Keflavik Intl

$750Multiple Airlines

Fri, Oct 30 - Sun, Nov 1

10:39 am - 6:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

24h 51m2 stops Chicago O'Hare Intl Kastrup Copenhagen

6:40 am - 9:04 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

21h 24m2 stops Kastrup Copenhagen San Francisco

$752Scandinavian Airlines

Wed, Feb 10 - Mon, Feb 15

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

8:35 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 25m1 stop Reykjavik Keflavik Intl

$752Multiple Airlines

Sun, Apr 4 - Sun, Apr 18

3:40 pm - 11:55 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

9:25 pm - 5:55 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 30m1 stop Reykjavik Keflavik Intl

$752Icelandair

Mon, Apr 5 - Tue, Apr 6

10:45 am - 2:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

19h 25m1 stop San Francisco

5:50 pm - 12:14 amLHR London Heathrow-SEA Seattle/Tacoma Intl

38h 24m2 stops Brussels Bruxelles-National Chicago O'Hare Intl

$752United Airlines

Sat, Dec 12 - Sun, Dec 13

10:39 am - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

21h 21m2 stops Chicago O'Hare Intl Kastrup Copenhagen

6:40 pm - 11:09 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

36h 29m2 stops Kastrup Copenhagen New York John F Kennedy Intl

$766Scandinavian Airlines

Tue, Dec 8 - Thu, Dec 10

8:09 am - 6:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

26h 21m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss

2:30 pm - 9:32 amLHR London Heathrow-SEA Seattle/Tacoma Intl

27h 02m1 stop Vancouver Intl

$804Lufthansa

Wed, Dec 9 - Fri, Dec 11

8:09 am - 3:50 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 41m2 stops Washington, D.C. Dulles Intl Munich Franz Josef Strauss

2:30 pm - 2:37 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

32h 07m1 stop Vancouver Intl

$804Lufthansa

Recent last minute flight deals from Washington to London

Fri, Oct 9 - Wed, Oct 14

6:50 pm - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

30h 30m3 stops Munich Franz Josef Strauss Stockholm Arlanda Warsaw Frederic Chopin

9:05 pm - 10:47 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

33h 42m3 stops Stockholm Arlanda Zurich Vancouver Intl

$763Multiple Airlines

Mon, Oct 12 - Thu, Oct 15

10:50 am - 9:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

26h 30m3 stops Vancouver Intl Frankfurt am Main Stockholm Arlanda

9:05 pm - 10:47 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

33h 42m3 stops Stockholm Arlanda Munich Franz Josef Strauss Vancouver Intl

$765Multiple Airlines

Sun, Oct 11 - Tue, Nov 3

7:00 pm - 11:55 amSEA Seattle/Tacoma Intl-LHR London Heathrow

32h 55m1 stop Reykjavik Keflavik Intl

8:35 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

28h 25m1 stop Reykjavik Keflavik Intl

$812Icelandair

Mon, Oct 12 - Thu, Oct 22

3:40 pm - 11:55 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

9:25 pm - 8:40 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

31h 15m1 stop Reykjavik Keflavik Intl

$818Icelandair

Mon, Oct 12 - Thu, Oct 22

10:59 pm - 9:35 amSEA Seattle/Tacoma Intl-LHR London Heathrow

26h 36m2 stops New York John F Kennedy Intl Oslo Gardermoen

6:40 pm - 11:13 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

36h 33m2 stops Kastrup Copenhagen San Francisco

$824Scandinavian Airlines

Tue, Oct 13 - Sat, Oct 31

10:51 am - 6:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 39m2 stops San Francisco Kastrup Copenhagen

6:40 am - 11:04 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

23h 24m2 stops Kastrup Copenhagen New York John F Kennedy Intl

$851Scandinavian Airlines

Tue, Oct 13 - Thu, Oct 15

6:50 pm - 3:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 50m1 stop Munich Franz Josef Strauss

6:30 am - 12:20 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 50m1 stop Frankfurt am Main

$866Lufthansa

Tue, Oct 13 - Thu, Oct 15

10:50 am - 2:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

19h 50m2 stops Vancouver Intl Frankfurt am Main

7:25 am - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

17h 34m1 stop Munich Franz Josef Strauss

$871Lufthansa

Sun, Oct 11 - Tue, Oct 13

9:50 pm - 3:35 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 45mnonstop

6:30 am - 11:52 amLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 22m1 stop Amsterdam Schiphol

$915KLM

Tue, Oct 13 - Thu, Oct 15

5:30 pm - 11:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

9:55 am - 4:35 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

14h 40m1 stop Amsterdam Schiphol

$915KLM

Recent direct flight deals from Washington to London

Mon, Jan 18 - Mon, Feb 1

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:55 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$837Iberia

Wed, Feb 10 - Mon, Feb 15

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:55 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$837British Airways

Wed, Jan 13 - Wed, Jan 27

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:55 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$837Multiple Airlines

Tue, Jan 12 - Tue, Feb 2

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:55 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$837British Airways

Tue, Jan 12 - Wed, Mar 10

6:40 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 40mnonstop

2:45 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 05mnonstop

$844Alaska Airlines

Wed, Jan 13 - Tue, Jan 19

6:50 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 30mnonstop

2:45 pm - 4:40 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$865Alaska Airlines

Mon, Nov 9 - Wed, Nov 25

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 30mnonstop

$881Virgin Atlantic

Mon, Nov 16 - Tue, Nov 24

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

9:25 am - 11:25 amLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 00mnonstop

$888Finnair

Wed, Dec 2 - Wed, Dec 9

6:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:55 pm - 4:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$900Finnair

Sun, Dec 6 - Fri, Dec 11

4:50 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 50mnonstop

12:20 pm - 2:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 30mnonstop

$918Virgin Atlantic

Useful Info

Low season	January
High season	July
Cheapest flight	$336

Best time to beat the crowds with an average 24% drop in price.

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

Flight from Seattle to London Heathrow Airport

MichaelFlew with Delta-May 2026

We like Delta, Alaska and American. Be prepared for a bit of a trek from your arrival gate to Customs and outside services. Heathrow doesn't rank high on my list of major airports.

Verified travelerFlew with American Airlines-Apr 2026

Heathrow is too gigantic to have less than 2 hours of layover time.

Verified travelerFlew with British Airways-Apr 2025

Make sure you have plenty of time between flights if you are delayed.

Verified travelerFlew with British Airways-Feb 2025

Don’t take a flight if you sick, or if you have no choice prepare to stay covered with mask throughout the flight

Verified travelerFlew with British Airways-Apr 2024

Bring a sack lunch -- airport food was very expensive.

How does KAYAK find such low prices on flights from Washington to London Heathrow Airport?
KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Washington to London Heathrow Airport.
How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Washington to London Heathrow Airport?
KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Washington is likely to change within 7 days, so travelers know whether to wait or book now.
What is the Hacker Fare option on flights from Washington to London Heathrow Airport?
Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to London Heathrow Airport with an airline and back to Washington with another airline.
What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Washington to London Heathrow Airport?
Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

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$336 Find Cheap Flights from Washington to London Heathrow Airport - Compare and Save

Cheap Flights from Washington to London

Recent round-trip flight deals from Washington to London

Recent one-way flight deals from Washington to London

Recent last minute flight deals from Washington to London

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