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.

$327 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

Wed, Dec 30 - Sun, Jan 10

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

$744Icelandair

Sun, Apr 11 - Wed, Apr 14

7:05 pm - 1:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

34h 15m1 stop Vancouver Intl

10:50 am - 9:58 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

19h 08m2 stops Munich Franz Josef Strauss Vancouver Intl

$744Lufthansa

Sun, Apr 11 - Wed, Apr 14

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

32h 45m2 stops Vancouver Intl Calgary

9:00 am - 9:58 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

20h 58m2 stops Munich Franz Josef Strauss Vancouver Intl

$744Lufthansa

Tue, Feb 2 - Fri, Feb 5

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

32h 45m1 stop Vancouver Intl

9:00 am - 8:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

19h 59m2 stops Zurich Toronto Pearson Intl

$745Air Canada

Mon, Nov 23 - Tue, Dec 8

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

35h 00m3 stops Reykjavik Keflavik Intl Stockholm Arlanda Oslo Gardermoen

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

18h 20m2 stops Stockholm Arlanda Reykjavik Keflavik Intl

$745Multiple Airlines

Mon, Dec 14 - Thu, Dec 24

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

12h 15m1 stop Reykjavik Keflavik Intl

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

12h 45m1 stop Reykjavik Keflavik Intl

$747Icelandair

Wed, Apr 14 - Tue, Apr 27

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

9h 45mnonstop

5:45 pm - 8:03 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 18mnonstop

$748KLM

Sun, Apr 11 - Wed, Apr 21

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

9h 45mnonstop

10:50 am - 1:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 20mnonstop

$748KLM

Wed, Apr 7 - Tue, Apr 13

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

9h 45mnonstop

10:50 am - 1:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 20mnonstop

$748Air France

Sun, Feb 14 - Sun, Feb 28

4:55 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 45mnonstop

6:20 am - 3:03 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

16h 43m1 stop Paris Charles de Gaulle

$783Air France

Recent last minute flight deals from Washington to London

Tue, Oct 27 - Thu, Dec 10

3:35 pm - 10:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

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

12h 45m1 stop Reykjavik Keflavik Intl

$796Icelandair

Tue, Oct 27 - Tue, Dec 8

3:35 pm - 10:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

12h 15m1 stop Reykjavik Keflavik Intl

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

12h 45m1 stop Reykjavik Keflavik Intl

$796Icelandair

Fri, Oct 30 - Tue, Nov 10

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

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

6:40 am - 10:55 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 15m2 stops Kastrup Copenhagen Boston Logan Intl

$901Scandinavian Airlines

Wed, Oct 28 - Wed, Nov 4

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

18h 40m1 stop Vancouver Intl

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

13h 20m1 stop Munich Franz Josef Strauss

$956Lufthansa

Wed, Oct 28 - Wed, Nov 4

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

13h 35m1 stop Vancouver Intl

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

13h 20m1 stop Munich Franz Josef Strauss

$956Lufthansa

Mon, Oct 26 - Tue, Oct 27

6:30 am - 6:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

16h 50m1 stop Newark

6:30 pm - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

25h 30m1 stop Frankfurt am Main

$958Multiple Airlines

Tue, Oct 27 - Tue, Dec 8

5:45 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 55mnonstop

6:30 am - 11:50 amLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 20m1 stop Amsterdam Schiphol

$960KLM

Tue, Oct 27 - Wed, Dec 9

5:45 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 55mnonstop

6:30 am - 11:50 amLHR London Heathrow-SEA Seattle/Tacoma Intl

13h 20m1 stop Amsterdam Schiphol

$960KLM

Wed, Oct 28 - Tue, Dec 8

5:45 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 55mnonstop

8:55 am - 1:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

12h 55m1 stop Paris Charles de Gaulle

$960Multiple Airlines

Tue, Oct 27 - Thu, Nov 5

7:24 am - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

18h 56m2 stops Boston Logan Intl Kastrup Copenhagen

10:20 am - 9:58 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

19h 38m2 stops Kastrup Copenhagen Los Angeles

$968Scandinavian Airlines

Recent direct flight deals from Washington to London

Wed, Apr 14 - Tue, Apr 27

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

9h 45mnonstop

5:45 pm - 8:03 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 18mnonstop

$748KLM

Sun, Apr 11 - Wed, Apr 21

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

9h 45mnonstop

10:50 am - 1:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 20mnonstop

$748KLM

Wed, Apr 7 - Tue, Apr 13

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

9h 45mnonstop

10:50 am - 1:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 20mnonstop

$748Air France

Mon, Nov 23 - Tue, Dec 8

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

$757Multiple Airlines

Tue, Dec 1 - Thu, Dec 10

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

$785Alaska Airlines

Mon, Nov 23 - Tue, Dec 8

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

$786Virgin Atlantic

Sun, Feb 14 - Sun, Feb 28

4:55 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 45mnonstop

12:20 pm - 2:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 25mnonstop

$793Air France

Sun, Jan 31 - Mon, Feb 8

4:55 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 45mnonstop

12:20 pm - 2:45 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 25mnonstop

$793Virgin Atlantic

Sun, Mar 14 - Sun, Mar 28

6:00 pm - 10:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 40mnonstop

10:50 am - 1:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 20mnonstop

$793Multiple Airlines

Mon, Nov 23 - 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

$814Alaska Airlines

Useful Info

Low season	January
High season	July
Cheapest flight	$327

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

Most popular time to fly with an average 22% 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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$327 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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