LHR

$281 Find Cheap Flights from Washington to London Heathrow Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Heathrow departing on 12/5. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

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Everything you should know

Cheapest round-trip
$528
Overall average: $685
Icelandair
Fri 3/27Tue 4/14
SEA - LHR • 1 stop
Cheapest non-stop
$554
Typical prices: $811-$1,503
Virgin Atlantic
Tue 12/9Tue 12/23
SEA - LHR • Non-stop
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We hope you love your trip to Heathrow!
Flight Deals
Useful Info
Flight Deals

Cheap Flights from Washington to Heathrow

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Washington to Heathrow that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Washington to Heathrow

Fri, Mar 27 - Tue, Apr 14
Icelandair Logo
7:00 pm - 7:30 pmSEA-LHR
17h 30m1 stop
Icelandair Logo
9:25 pm - 8:45 pmLHR-SEA
31h 20m1 stop
$528Icelandair
Find Deal
Thu, Apr 9 - Tue, Apr 28
Icelandair Logo
7:00 pm - 8:20 pmSEA-LHR
17h 20m1 stop
Icelandair Logo
1:05 pm - 5:50 pmLHR-SEA
12h 45m1 stop
$529Icelandair
Find Deal
Tue, Apr 7 - Tue, Apr 14
Icelandair Logo
7:00 pm - 8:20 pmSEA-LHR
17h 20m1 stop
Icelandair Logo
9:25 pm - 8:45 pmLHR-SEA
31h 20m1 stop
$530Icelandair
Find Deal
Sat, Mar 28 - Sun, Apr 5
Icelandair Logo
3:35 pm - 10:55 amSEA-LHR
12h 20m1 stop
Icelandair Logo
9:25 pm - 8:45 pmLHR-SEA
31h 20m1 stop
$531Icelandair
Find Deal
Wed, Jan 14 - Thu, Jan 29
Virgin Atlantic Logo
6:00 am - 7:05 amPDX-LHR
17h 05m1 stop
Virgin Atlantic Logo
11:05 am - 5:35 pmLHR-PDX
14h 30m1 stop
$567Virgin Atlantic
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Mon, Nov 24 - Wed, Dec 3
KLM Logo
1:45 pm - 10:00 amPDX-LHR
12h 15m1 stop
KLM Logo
6:30 am - 11:25 amLHR-PDX
12h 55m1 stop
$577KLM
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Wed, Dec 3 - Wed, Dec 10
KLM Logo
1:45 pm - 10:00 amPDX-LHR
12h 15m1 stop
KLM Logo
6:30 am - 11:25 amLHR-PDX
12h 55m1 stop
$580KLM
Find Deal
Tue, Nov 25 - Wed, Dec 10
Delta Logo
12:35 am - 7:05 amPDX-LHR
22h 30m1 stop
Delta Logo
6:30 am - 11:25 amLHR-PDX
12h 55m1 stop
$581Delta
Find Deal
Mon, Feb 9 - Wed, Feb 18
Finnair Logo
7:38 am - 6:50 amPDX-LHR
15h 12m1 stop
Finnair Logo
1:45 pm - 3:55 pmLHR-PDX
10h 10mnonstop
$584Finnair
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Mon, Jan 5 - Fri, Jan 16
Delta Logo
1:00 pm - 12:50 pmPSC-LHR
15h 50m1 stop
Delta Logo
6:20 am - 11:09 pmLHR-PSC
24h 49m2 stops
$597Delta
Find Deal
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$281
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly with an average 17% increase in price.
Flight from Portland to London Heathrow Airport

Flights from Washington to Heathrow: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Washington to Heathrow 
Learn how KAYAK collects reviews and tips from users.
Verified travelerFlew with British AirwaysSEA-LHRApr 2025
Make sure you have plenty of time between flights if you are delayed.
Verified travelerFlew with British AirwaysSEA-LHRApr 2024
Bring a sack lunch -- airport food was very expensive.

FAQs for booking Washington to London Heathrow Airport flights

  • 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.

Traveling to a place near Heathrow?

Book flights to Heathrow if you plan to visit one of these locations
Hounslow
Slough
Wembley
Hayes
Richmond
Luton
Ilford
Salisbury
Crawley
Guildford
Watford
Kingston upon Thames
Eastbourne
Colchester
Ipswich
St. Albans
Northampton
Swindon
Twickenham
Harrow

Everything you need to know for your flight to Heathrow

Information on your arrival and departure airports

London Heathrow Airport (LHR)