LHR

$175 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 10/17. 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

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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

Wed, Oct 8 - Wed, Oct 15
Icelandair Logo
3:45 pm - 8:20 pmSEA-LHR
20h 35m1 stop
Icelandair Logo
1:05 pm - 8:40 pmLHR-SEA
15h 35m1 stop
$481Icelandair
Find Deal
Mon, Nov 10 - Thu, Dec 11
Icelandair Logo
2:35 pm - 7:30 pmSEA-LHR
20h 55m1 stop
Icelandair Logo
12:15 pm - 5:00 pmLHR-SEA
12h 45m1 stop
$482Icelandair
Find Deal
Tue, Aug 12 - Wed, Aug 27
Lufthansa Logo
1:55 pm - 11:45 amSEA-LHR
13h 50m1 stop
Lufthansa Logo
2:05 pm - 8:41 pmLHR-SEA
14h 36m1 stop
$508Lufthansa
Find Deal
Wed, Aug 27 - Wed, Sep 17
 Logo
7:20 am - 6:30 amSEA-LHR
15h 10m1 stop
 Logo
6:00 am - 6:36 pmLHR-SEA
20h 36m2 stops
Tue, Aug 19 - Wed, Sep 3
British Airways Logo
1:30 pm - 6:50 amSEA-LHR
9h 20mnonstop
British Airways Logo
9:50 am - 11:35 amLHR-SEA
9h 45mnonstop
$527British Airways
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Wed, Aug 27 - Wed, Sep 10
Air Canada Logo
7:20 am - 10:00 amSEA-LHR
18h 40m1 stop
Air Canada Logo
8:40 am - 7:31 pmLHR-SEA
18h 51m2 stops
$529Air Canada
Find Deal
Wed, Aug 6 - Wed, Aug 20
British Airways Logo
1:30 pm - 6:50 amSEA-LHR
9h 20mnonstop
British Airways Logo
9:50 am - 11:35 amLHR-SEA
9h 45mnonstop
$532British Airways
Find Deal
Tue, Aug 19 - Thu, Aug 28
Air Canada Logo
7:20 am - 10:00 amSEA-LHR
18h 40m1 stop
Air Canada Logo
6:50 am - 8:41 pmLHR-SEA
21h 51m2 stops
$536Air Canada
Find Deal
Sun, Aug 3 - Tue, Aug 19
 Logo
2:55 pm - 2:40 pmPSC-LHR
15h 45m1 stop
 Logo
2:45 pm - 11:59 pmLHR-PSC
17h 14m1 stop
Fri, Aug 8 - Mon, Aug 18
Lufthansa Logo
1:37 pm - 9:40 amGEG-LHR
12h 03m1 stop
Lufthansa Logo
4:25 pm - 9:03 pmLHR-GEG
36h 38m2 stops
$920Lufthansa
Find Deal
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Good to know

Low seasonFebruary
High seasonJuly
Cheapest flight$175
Best time to beat the crowds with an average 14% drop in price.
Most popular time to fly with an average 21% increase in price.
Flight from Seattle 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 
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
Ilford
Deal
Southall
St. Albans
Folkestone
Chipping Campden
Barnet
Bishop's Stortford
Ascot
Ely
Enfield
Rye
Edgware
Weybridge
Alton
Woodstock
Christchurch
Dorking
Beaconsfield
Hatfield

Everything you need to know for your flight to Heathrow

Information on your arrival and departure airports

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