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.

$276 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

Mon, Feb 22 - Mon, Mar 1

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

20h 55m1 stop Reykjavik Keflavik Intl

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

28h 25m1 stop Reykjavik Keflavik Intl

$740Icelandair

Tue, Oct 6 - Wed, Oct 21

3:55 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

16h 05m1 stop Kastrup Copenhagen

7:05 am - 11:04 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

23h 59m2 stops Oslo Gardermoen New York John F Kennedy Intl

$741Scandinavian Airlines

Mon, Oct 12 - Mon, Oct 19

3:40 pm - 9:35 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

21h 55m2 stops Reykjavik Keflavik Intl Oslo Gardermoen

7:05 am - 5:55 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

18h 50m2 stops Oslo Gardermoen Reykjavik Keflavik Intl

$742Multiple Airlines

Mon, Oct 19 - Fri, Oct 23

6:55 pm - 4:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

13h 05m1 stop Dublin

7:40 am - 5:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

17h 30m1 stop Dublin

$743Aer Lingus

Wed, Feb 24 - Sun, Mar 7

8:15 am - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 05m2 stops Vancouver Intl Calgary

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

28h 25m1 stop Reykjavik Keflavik Intl

$743Multiple Airlines

Mon, Oct 19 - Wed, Nov 4

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

32h 55m1 stop Reykjavik Keflavik Intl

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

12h 45m1 stop Reykjavik Keflavik Intl

$743Icelandair

Tue, Oct 6 - Wed, Oct 21

3:55 pm - 6:30 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

18h 35m1 stop Kastrup Copenhagen

7:05 am - 11:04 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

23h 59m2 stops Oslo Gardermoen New York John F Kennedy Intl

$744Scandinavian Airlines

Wed, Nov 4 - Fri, Nov 6

8:30 am - 9:10 amSEA Seattle/Tacoma Intl-LHR London Heathrow

16h 40m2 stops Denver Intl Newark

6:50 am - 8:56 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

22h 06m2 stops Brussels Bruxelles-National Washington, D.C. Dulles Intl

$786United Airlines

Sun, Oct 4 - Tue, Oct 6

2:10 pm - 4:40 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

18h 30m1 stop Frankfurt am Main

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

17h 34m1 stop Munich Franz Josef Strauss

$794United Airlines

Mon, Sep 14 - Thu, Sep 17

7:10 pm - 3:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

11h 50m1 stop Dublin

8:50 am - 5:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

16h 20m1 stop Dublin

$956Aer Lingus

Recent last minute flight deals from Washington to London

Fri, Sep 4 - Thu, Sep 10

2:10 pm - 9:20 amSEA Seattle/Tacoma Intl-LHR London Heathrow

35h 10m3 stops Frankfurt am Main Stockholm Arlanda Kastrup Copenhagen

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

22h 24m2 stops Stockholm Arlanda Toronto Pearson Intl

$857Multiple Airlines

Tue, Sep 1 - Thu, Sep 10

7:10 pm - 3:00 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

11h 50m1 stop Dublin

9:50 am - 5:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

15h 20m1 stop Dublin

$869Aer Lingus

Fri, Sep 4 - Sun, Nov 1

10:13 pm - 8:45 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

14h 32m1 stop New York John F Kennedy Intl

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

28h 25m1 stop Reykjavik Keflavik Intl

$883Multiple Airlines

Tue, Sep 1 - Fri, Sep 4

5:15 pm - 11:35 amSEA Seattle/Tacoma Intl-LHR London Heathrow

34h 20m1 stop Houston George Bush Intcntl

7:25 am - 11:04 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

23h 39m2 stops Munich Franz Josef Strauss Denver Intl

$896United Airlines

Wed, Sep 2 - Sun, Sep 6

12:25 pm - 12:10 pmPDX Portland-LHR London Heathrow

15h 45m1 stop Seattle/Tacoma Intl

6:30 am - 11:10 amLHR London Heathrow-PDX Portland

12h 40m1 stop Amsterdam Schiphol

$905Virgin Atlantic

Sat, Sep 5 - Mon, Sep 14

10:35 pm - 8:10 pmPDX Portland-LHR London Heathrow

13h 35m1 stop New York John F Kennedy Intl

6:30 am - 11:10 amLHR London Heathrow-PDX Portland

12h 40m1 stop Amsterdam Schiphol

$909Delta

Fri, Sep 4 - Tue, Sep 8

7:00 am - 6:20 amPDX Portland-LHR London Heathrow

15h 20m1 stop New York John F Kennedy Intl

6:30 am - 11:10 amLHR London Heathrow-PDX Portland

12h 40m1 stop Amsterdam Schiphol

$909Delta

Sat, Sep 5 - Tue, Sep 8

11:59 pm - 7:45 amSEA Seattle/Tacoma Intl-LHR London Heathrow

23h 46m1 stop Houston George Bush Intcntl

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

17h 34m1 stop Munich Franz Josef Strauss

$948United Airlines

Wed, Sep 2 - Tue, Sep 8

7:10 pm - 6:55 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

15h 45m1 stop Dublin

8:50 am - 5:10 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

16h 20m1 stop Dublin

$958Aer Lingus

Thu, Sep 3 - Sat, Sep 5

7:00 am - 6:20 amPDX Portland-LHR London Heathrow

15h 20m1 stop New York John F Kennedy Intl

9:20 am - 9:44 pmLHR London Heathrow-PDX Portland

20h 24m1 stop Atlanta Hartsfield-Jackson

$998Virgin Atlantic

Recent direct flight deals from Washington to London

Tue, Dec 1 - Sun, Dec 6

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

$835British Airways

Sun, Nov 29 - Fri, Dec 4

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

$835British Airways

Sun, Jan 10 - Sat, Jan 23

6:55 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

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

10h 00mnonstop

$844Multiple Airlines

Tue, Feb 2 - Tue, Feb 16

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

$844Multiple Airlines

Sun, Dec 6 - Sun, Dec 13

6:55 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

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

10h 05mnonstop

$852Alaska Airlines

Wed, Dec 9 - Sat, Mar 20

6:55 pm - 12:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

2:45 pm - 5:50 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 05mnonstop

$852Alaska Airlines

Sun, Oct 18 - Tue, Nov 3

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

9h 15mnonstop

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

10h 00mnonstop

$866Finnair

Mon, Oct 19 - Tue, Nov 3

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

9h 25mnonstop

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

9h 55mnonstop

$867Finnair

Wed, Dec 9 - 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

$880Virgin Atlantic

Wed, Dec 9 - Tue, Dec 15

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

$880Virgin Atlantic

Useful Info

Low season	January
High season	July
Cheapest flight	$276

Best time to beat the crowds with an average 22% drop in price.

Most popular time to fly with an average 26% 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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$276 Find Cheap Flights from Washington to London Heathrow Airport - Compare and Save

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