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.

$330 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

Thu, Jan 14 - Sun, May 2

2:35 pm - 10:50 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

$725Icelandair

Thu, Feb 11 - Sat, Feb 20

2:35 pm - 10:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

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

28h 25m1 stop Reykjavik Keflavik Intl

$727Icelandair

Sun, Nov 15 - Wed, Nov 18

1:50 pm - 9:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 50m2 stops Frankfurt am Main Kastrup Copenhagen

6:40 am - 9:57 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

23h 17m3 stops Kastrup Copenhagen Toronto Pearson Intl Vancouver Intl

$731Multiple Airlines

Tue, Jan 12 - Tue, Jan 19

2:35 pm - 6:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

19h 55m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen

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

28h 25m1 stop Reykjavik Keflavik Intl

$740Multiple Airlines

Tue, Feb 16 - Thu, Feb 18

10:10 am - 11:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 40m1 stop Vancouver Intl

8:45 am - 9:32 amLHR London Heathrow-SEA Seattle/Tacoma Intl

32h 47m2 stops Munich Franz Josef Strauss Vancouver Intl

$755Lufthansa

Mon, Mar 29 - Tue, Mar 30

8:40 am - 1:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

20h 40m1 stop Vancouver Intl

5:50 pm - 6:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

33h 09m2 stops Brussels Bruxelles-National Chicago O'Hare Intl

$758United Airlines

Sat, May 1 - Sat, May 22

6:00 am - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

43h 20m2 stops Atlanta Hartsfield-Jackson Kastrup Copenhagen

3:35 pm - 1:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

30h 10m2 stops Oslo Gardermoen Kastrup Copenhagen

$759Scandinavian Airlines

Sat, May 1 - Sat, May 22

6:00 am - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

43h 20m2 stops Atlanta Hartsfield-Jackson Kastrup Copenhagen

6:40 am - 1:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

15h 05m1 stop Kastrup Copenhagen

$761Scandinavian Airlines

Tue, Mar 2 - Fri, Mar 5

12:22 pm - 7:25 amGEG Spokane-LHR London Heathrow

35h 03m1 stop San Francisco

6:35 am - 8:59 pmLHR London Heathrow-GEG Spokane

22h 24m2 stops Munich Franz Josef Strauss San Francisco

$764United Airlines

Wed, Feb 17 - Fri, Feb 19

2:50 pm - 3:50 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 00m1 stop Munich Franz Josef Strauss

8:45 am - 10:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

22h 14m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl

$768Lufthansa

Recent last minute flight deals from Washington to London

Tue, Nov 10 - Tue, Dec 8

2:35 pm - 7:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

20h 55m1 stop Reykjavik Keflavik Intl

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

12h 45m1 stop Reykjavik Keflavik Intl

$740Icelandair

Tue, Nov 10 - Thu, Nov 19

2:35 pm - 7:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

20h 55m1 stop Reykjavik Keflavik Intl

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

12h 45m1 stop Reykjavik Keflavik Intl

$756Icelandair

Sun, Nov 8 - Wed, Nov 11

2:35 pm - 10:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

6:40 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

30h 20m2 stops Kastrup Copenhagen Reykjavik Keflavik Intl

$796Multiple Airlines

Sun, Nov 8 - Wed, Nov 11

2:35 pm - 9:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 05m2 stops Reykjavik Keflavik Intl Kastrup Copenhagen

6:40 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

30h 20m2 stops Kastrup Copenhagen Reykjavik Keflavik Intl

$797Multiple Airlines

Tue, Nov 10 - Mon, Nov 16

12:31 pm - 5:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

21h 09m2 stops Los Angeles Kastrup Copenhagen

10:20 am - 11:53 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

21h 33m2 stops Kastrup Copenhagen Los Angeles

$851Scandinavian Airlines

Thu, Nov 5 - Fri, Nov 20

7:15 am - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

18h 05m2 stops New York John F Kennedy Intl Kastrup Copenhagen

7:30 pm - 10:05 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

34h 35m2 stops Kastrup Copenhagen Boston Logan Intl

$851Scandinavian Airlines

Mon, Nov 9 - Wed, Nov 11

3:15 pm - 11:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 35m1 stop Vancouver Intl

7:40 am - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 20m1 stop Munich Franz Josef Strauss

$882Lufthansa

Tue, Nov 10 - Thu, Nov 12

10:10 am - 11:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 40m1 stop Vancouver Intl

6:30 am - 2:37 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

16h 07m2 stops Frankfurt am Main Vancouver Intl

$897Lufthansa

Sun, Nov 8 - Wed, Nov 11

7:05 pm - 11:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

32h 45m1 stop Vancouver Intl

6:35 am - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

14h 25m1 stop Munich Franz Josef Strauss

$948United Airlines

Sun, Nov 8 - Wed, Nov 11

7:05 pm - 11:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

32h 45m1 stop Vancouver Intl

6:35 am - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

14h 25m1 stop Munich Franz Josef Strauss

$949United Airlines

Recent direct flight deals from Washington to London

Sun, Feb 14 - Sun, Feb 28

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

$774Aer Lingus

Mon, Nov 30 - Wed, Dec 16

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

$794Virgin Atlantic

Mon, Nov 30 - Wed, Dec 16

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

$795KLM

Mon, Nov 30 - Wed, Dec 16

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

$800Virgin Atlantic

Wed, Dec 2 - Wed, Dec 16

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

$813Delta

Tue, Dec 1 - Tue, Dec 8

6:45 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 35mnonstop

2:45 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 15mnonstop

$813Alaska Airlines

Mon, Nov 30 - Wed, Dec 9

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

$814KLM

Sun, Nov 29 - Wed, Dec 16

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

$814Delta

Wed, Dec 2 - Wed, Dec 9

6:45 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 35mnonstop

2:45 pm - 5:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 15mnonstop

$814Alaska Airlines

Tue, Nov 24 - Tue, Dec 8

1:30 pm - 7:00 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 30mnonstop

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

10h 00mnonstop

$878Aer Lingus

Useful Info

Low season	January
High season	July
Cheapest flight	$330

Best time to beat the crowds with an average 23% drop in price.

Most popular time to fly with an average 21% 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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$330 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

Recent direct flight deals from Washington to London

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