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.

$298 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, 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

$583Icelandair

Fri, Feb 26 - Sun, Mar 7

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

$669Icelandair

Mon, Nov 2 - Wed, Nov 11

5:00 am - 12:20 pmGEG Spokane-LHR London Heathrow

23h 20m1 stop Seattle/Tacoma Intl

2:45 pm - 2:22 pmLHR London Heathrow-GEG Spokane

31h 37m1 stop Seattle/Tacoma Intl

$742Alaska Airlines

Tue, Mar 2 - Fri, Mar 5

6:00 am - 12:20 pmPSC Pasco Tri Cities-LHR London Heathrow

22h 20m1 stop Seattle/Tacoma Intl

2:45 pm - 12:37 pmLHR London Heathrow-PSC Pasco Tri Cities

29h 52m1 stop Seattle/Tacoma Intl

$746Alaska Airlines

Mon, Oct 5 - Tue, Oct 13

5:25 am - 11:20 amPSC Pasco Tri Cities-LHR London Heathrow

21h 55m1 stop Seattle/Tacoma Intl

6:30 am - 7:35 pmLHR London Heathrow-PSC Pasco Tri Cities

21h 05m2 stops Amsterdam Schiphol Minneapolis St Paul

$749Delta

Wed, Oct 14 - Wed, Oct 21

11:18 am - 11:20 amGEG Spokane-LHR London Heathrow

16h 02m1 stop Seattle/Tacoma Intl

8:40 am - 8:08 pmLHR London Heathrow-GEG Spokane

19h 28m2 stops Amsterdam Schiphol Minneapolis St Paul

$749Delta

Tue, Oct 13 - Tue, Oct 20

1:00 pm - 1:15 pmGEG Spokane-LHR London Heathrow

16h 15m1 stop Atlanta Hartsfield-Jackson

6:30 am - 2:50 pmLHR London Heathrow-GEG Spokane

16h 20m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

$749KLM

Tue, Oct 13 - Thu, Oct 29

1:00 pm - 3:35 pmGEG Spokane-LHR London Heathrow

18h 35m1 stop Seattle/Tacoma Intl

6:20 am - 8:08 pmLHR London Heathrow-GEG Spokane

20h 48m2 stops Paris Charles de Gaulle Minneapolis St Paul

$749Multiple Airlines

Wed, Oct 14 - Wed, Oct 21

4:24 pm - 5:35 pmGEG Spokane-LHR London Heathrow

17h 11m1 stop Los Angeles

11:40 am - 11:50 pmLHR London Heathrow-GEG Spokane

20h 10m1 stop Seattle/Tacoma Intl

$755Virgin Atlantic

Fri, Nov 6 - Wed, Nov 18

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

17h 40m1 stop Vancouver Intl

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

19h 59m2 stops Zurich Toronto Pearson Intl

$772Air Canada

Recent last minute flight deals from Washington to London

Sun, Sep 20 - Wed, Sep 30

3:25 pm - 11:20 amPSC Pasco Tri Cities-LHR London Heathrow

11h 55m1 stop Seattle/Tacoma Intl

6:15 am - 7:41 pmLHR London Heathrow-PSC Pasco Tri Cities

21h 26m2 stops Paris Charles de Gaulle Minneapolis St Paul

$749Delta

Sun, Sep 20 - Wed, Sep 30

7:05 am - 7:15 amPSC Pasco Tri Cities-LHR London Heathrow

16h 10m2 stops Minneapolis St Paul New York John F Kennedy Intl

6:30 am - 7:41 pmLHR London Heathrow-PSC Pasco Tri Cities

21h 11m2 stops Amsterdam Schiphol Minneapolis St Paul

$754Delta

Sun, Sep 20 - Wed, Sep 30

3:25 pm - 11:20 amPSC Pasco Tri Cities-LHR London Heathrow

11h 55m1 stop Seattle/Tacoma Intl

10:55 am - 4:43 pmLHR London Heathrow-PSC Pasco Tri Cities

13h 48m1 stop Salt Lake City

$756Virgin Atlantic

Sat, Sep 19 - Sat, Dec 12

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

33h 00m1 stop Los Angeles

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

27h 02m1 stop Vancouver Intl

$774United Airlines

Sun, Sep 20 - Sat, Dec 12

6:52 pm - 10:10 amSEA Seattle/Tacoma Intl-LHR London Heathrow

31h 18m1 stop Los Angeles

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

32h 07m1 stop Vancouver Intl

$774United Airlines

Sun, Sep 20 - Fri, Oct 2

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

15h 50m2 stops Munich Franz Josef Strauss Frankfurt am Main

9:30 am - 10:47 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

21h 17m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

$776Lufthansa

Sun, Sep 20 - Sat, Dec 12

9:40 pm - 3:05 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

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

10h 05mnonstop

$778Alaska Airlines

Sun, Sep 20 - Tue, Oct 6

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

15h 50m2 stops Munich Franz Josef Strauss Frankfurt am Main

6:30 am - 2:22 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

15h 52m2 stops Frankfurt am Main Vancouver Intl

$781Lufthansa

Sat, Sep 19 - Fri, Sep 25

9:40 pm - 3:05 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

5:00 pm - 7:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 00mnonstop

$781Alaska Airlines

Sun, Sep 20 - Tue, Oct 6

1:40 pm - 10:50 amSEA Seattle/Tacoma Intl-LHR London Heathrow

13h 10m1 stop Chicago O'Hare Intl

9:50 am - 11:35 amLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 45mnonstop

$782Finnair

Recent direct flight deals from Washington to London

Thu, Feb 18 - Thu, Feb 25

1:40 pm - 7:10 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 30mnonstop

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

10h 00mnonstop

$771British Airways

Mon, Oct 12 - Mon, Oct 19

1:30 pm - 6:45 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 15mnonstop

9:50 am - 11:35 amLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 45mnonstop

$771British Airways

Sun, Nov 1 - Fri, Nov 6

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

$774Virgin Atlantic

Mon, Oct 12 - Mon, Oct 19

1:30 pm - 6:45 amSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 15mnonstop

9:50 am - 11:35 amLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 45mnonstop

$778American Airlines

Sun, Oct 11 - Sun, Oct 18

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

9h 45mnonstop

6:30 pm - 8:55 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 25mnonstop

$780Air France

Wed, Oct 21 - Sun, Oct 25

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

9h 45mnonstop

12:20 pm - 3:54 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 34mnonstop

$781Virgin Atlantic

Fri, Oct 2 - Fri, Oct 9

8:20 pm - 1:45 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

9:50 am - 11:35 amLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 45mnonstop

$781American Airlines

Sun, Oct 11 - Sun, Oct 18

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

9h 45mnonstop

6:30 pm - 8:55 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 25mnonstop

$781Air France

Tue, Oct 27 - Sat, Nov 7

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

9h 55mnonstop

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

10h 30mnonstop

$781KLM

Sat, Nov 14 - Tue, Nov 24

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

$781KLM

Useful Info

Low season	January
High season	July
Cheapest flight	$298

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

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

Flight from Portland 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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$298 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

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