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.

$297 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

Tue, Oct 13 - Fri, Oct 30

6:22 am - 10:15 amGEG Spokane-LHR London Heathrow

19h 53m1 stop Los Angeles

8:55 am - 11:59 pmLHR London Heathrow-GEG Spokane

22h 04m2 stops Paris Charles de Gaulle Los Angeles

$743Virgin Atlantic

Tue, Oct 13 - Tue, Nov 3

1:59 pm - 1:05 pmGEG Spokane-LHR London Heathrow

15h 06m1 stop Minneapolis St Paul

8:55 am - 11:59 pmLHR London Heathrow-GEG Spokane

23h 04m2 stops Paris Charles de Gaulle Los Angeles

$744Virgin Atlantic

Wed, Oct 28 - Tue, Nov 3

9:30 am - 10:40 amGEG Spokane-LHR London Heathrow

18h 10m1 stop Seattle/Tacoma Intl

6:30 am - 4:58 pmLHR London Heathrow-GEG Spokane

18h 28m2 stops Amsterdam Schiphol Seattle/Tacoma Intl

$746Delta

Wed, Nov 18 - Wed, Nov 25

4:25 pm - 4:30 pmGEG Spokane-LHR London Heathrow

16h 05m1 stop Los Angeles

8:40 am - 8:09 pmLHR London Heathrow-GEG Spokane

19h 29m2 stops Amsterdam Schiphol Minneapolis St Paul

$746Delta

Tue, Nov 10 - Tue, Nov 24

1:10 pm - 10:40 amGEG Spokane-LHR London Heathrow

13h 30m1 stop Seattle/Tacoma Intl

8:40 am - 8:09 pmLHR London Heathrow-GEG Spokane

19h 29m2 stops Amsterdam Schiphol Minneapolis St Paul

$746Multiple Airlines

Tue, Mar 2 - Fri, Mar 5

4:00 pm - 9:40 amGEG Spokane-LHR London Heathrow

33h 40m1 stop Denver Intl

9:00 am - 11:38 pmLHR London Heathrow-GEG Spokane

22h 38m2 stops Zurich San Francisco

$760United Airlines

Tue, Mar 2 - Fri, Mar 5

4:00 pm - 9:40 amGEG Spokane-LHR London Heathrow

33h 40m1 stop Denver Intl

9:00 am - 11:38 pmLHR London Heathrow-GEG Spokane

22h 38m2 stops Zurich San Francisco

$761United Airlines

Sun, Mar 14 - Fri, Apr 2

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

17h 00m1 stop Minneapolis St Paul

10:50 am - 11:38 pmLHR London Heathrow-PSC Pasco Tri Cities

20h 48m1 stop Seattle/Tacoma Intl

$769KLM

Tue, Oct 27 - Sat, Nov 7

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

18h 40m1 stop Vancouver Intl

8:15 pm - 1:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

24h 45m1 stop Munich Franz Josef Strauss

$773Lufthansa

Thu, Oct 15 - Thu, Oct 22

10:10 am - 11:50 amPDX Portland-LHR London Heathrow

17h 40m2 stops Vancouver Intl Calgary

6:00 am - 7:11 pmLHR London Heathrow-PDX Portland

21h 11m2 stops Zurich Vancouver Intl

$779Air Canada

Recent last minute flight deals from Washington to London

Wed, Sep 23 - Wed, Oct 14

5:24 am - 10:00 amGEG Spokane-LHR London Heathrow

20h 36m1 stop Salt Lake City

8:55 am - 9:10 pmLHR London Heathrow-GEG Spokane

20h 15m2 stops Paris Charles de Gaulle Seattle/Tacoma Intl

$748Delta

Wed, Sep 23 - Wed, Oct 14

6:22 am - 7:10 amGEG Spokane-LHR London Heathrow

16h 48m2 stops Los Angeles Detroit Metropolitan Wayne County

6:30 am - 4:14 pmLHR London Heathrow-GEG Spokane

17h 44m2 stops Amsterdam Schiphol Salt Lake City

$753Delta

Wed, Sep 23 - Wed, Oct 14

3:59 pm - 3:35 pmGEG Spokane-LHR London Heathrow

15h 36m1 stop Seattle/Tacoma Intl

9:55 am - 11:59 pmLHR London Heathrow-GEG Spokane

22h 04m1 stop Los Angeles

$756Multiple Airlines

Fri, Sep 25 - Wed, Oct 7

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

$773KLM

Fri, Sep 25 - Mon, Oct 12

7:10 pm - 8:20 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

17h 10m1 stop Dublin

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

17h 30m1 stop Dublin

$773Aer Lingus

Thu, Sep 24 - Thu, Oct 15

7:17 am - 11:35 amSEA Seattle/Tacoma Intl-LHR London Heathrow

20h 18m1 stop Houston George Bush Intcntl

6:55 am - 4:59 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

18h 04m1 stop Munich Franz Josef Strauss

$773United Airlines

Fri, Sep 25 - Fri, Oct 2

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

$774KLM

Sat, Sep 26 - Mon, Oct 5

3:55 pm - 9:40 amSEA Seattle/Tacoma Intl-LHR London Heathrow

33h 45m1 stop Denver Intl

5:40 pm - 9:04 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

35h 24m1 stop Toronto Pearson Intl

$780United Airlines

Fri, Sep 25 - Tue, Oct 6

10:33 pm - 8:40 pmPDX Portland-LHR London Heathrow

14h 07m1 stop Newark

6:40 pm - 7:11 pmLHR London Heathrow-PDX Portland

32h 31m2 stops Zurich Vancouver Intl

$791Multiple Airlines

Thu, Sep 24 - Thu, Oct 15

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

$893Aer Lingus

Recent direct flight deals from Washington to London

Thu, Mar 4 - Fri, Mar 12

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

9h 30mnonstop

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

9h 55mnonstop

$773British Airways

Sun, Mar 21 - Sat, Apr 3

7:45 pm - 12:10 pmSEA Seattle/Tacoma Intl-LHR London Heathrow

9h 25mnonstop

4:30 pm - 6:25 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$774British Airways

Sun, Oct 4 - Sun, Oct 11

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

9h 50mnonstop

11:40 am - 2:00 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 20mnonstop

$775Virgin Atlantic

Fri, Oct 16 - Fri, Oct 23

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

9h 50mnonstop

5:45 pm - 8:14 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

10h 29mnonstop

$775Virgin Atlantic

Thu, Nov 19 - Thu, Nov 26

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

9h 30mnonstop

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

9h 55mnonstop

$775Iberia

Sat, Oct 17 - Wed, Oct 21

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

$778Alaska Airlines

Sat, Nov 14 - Tue, Dec 1

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

$779Alaska Airlines

Fri, Oct 9 - Fri, Oct 16

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

$779American Airlines

Thu, Oct 8 - Thu, Oct 15

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

9h 25mnonstop

4:30 pm - 6:25 pmLHR London Heathrow-SEA Seattle/Tacoma Intl

9h 55mnonstop

$779American Airlines

Thu, Nov 19 - Thu, Nov 26

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

9h 30mnonstop

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

9h 55mnonstop

$780Iberia

Useful Info

Low season	January
High season	July
Cheapest flight	$297

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

Most popular time to fly with an average 23% 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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