£320 Find Cheap Flights from Washington to London Heathrow Airport

This is the cheapest return flight price found by a KAYAK user in the last 72 hours by searching for a flight to Heathrow departing on 1/10. 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 return 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 return flight deals from Washington to Heathrow

Wed, 1 Oct - Tue, 14 Oct
Scandinavian Airlines Logo
16:20 - 16:00SEA-LHR
15h 40m1 stop
Scandinavian Airlines Logo
19:50 - 14:00LHR-SEA
26h 10m2 stops
£320Scandinavian Airlines
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Wed, 15 Oct - Mon, 20 Oct
Scandinavian Airlines Logo
16:20 - 17:40SEA-LHR
17h 20m1 stop
Scandinavian Airlines Logo
19:50 - 14:00LHR-SEA
50h 10m2 stops
£322Scandinavian Airlines
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Mon, 6 Oct - Thu, 9 Oct
United Airlines Logo
19:40 - 13:20PDX-LHR
33h 40m1 stop
United Airlines Logo
06:30 - 18:46LHR-PDX
20h 16m2 stops
£375United Airlines
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Mon, 17 Nov - Wed, 19 Nov
Logo
15:25 - 11:50PDX-LHR
12h 25m1 stop
Logo
08:55 - 22:33LHR-PDX
21h 38m2 stops
£381
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Wed, 1 Oct - Tue, 14 Oct
British Airways Logo
13:30 - 06:50SEA-LHR
9h 20mdirect
British Airways Logo
09:25 - 11:10LHR-SEA
9h 45mdirect
£386British Airways
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Sun, 24 Aug - Tue, 9 Sep
Iberia Logo
06:10 - 12:15SEA-LHR
22h 05m1 stop
Iberia Logo
09:25 - 11:10LHR-SEA
9h 45mdirect
£405Iberia
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Wed, 12 Nov - Thu, 20 Nov
Iberia Logo
10:35 - 10:00SEA-LHR
15h 25m1 stop
Iberia Logo
12:35 - 23:15LHR-SEA
18h 40m1 stop
£408Iberia
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Wed, 27 Aug - Fri, 12 Sep
British Airways Logo
07:44 - 06:25SEA-LHR
14h 41m1 stop
British Airways Logo
09:50 - 11:35LHR-SEA
9h 45mdirect
£415British Airways
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Sun, 5 Oct - Fri, 10 Oct
Logo
10:00 - 11:50PDX-LHR
17h 50m2 stops
Logo
08:40 - 18:46LHR-PDX
18h 06m2 stops
£423
Find Deal
Wed, 17 Sep - Wed, 8 Oct
United Airlines Logo
07:15 - 06:30SEA-LHR
15h 15m1 stop
United Airlines Logo
09:00 - 16:59LHR-SEA
15h 59m1 stop
£460United Airlines
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Good to know - Cheap tickets from Washington to London Heathrow Airport

Low seasonFebruary
High seasonAugust
Cheapest flight£146
Best time to beat the crowds (8% less expensive on average)
Most popular time to fly and prices are also 1% lower on average.
Flight from Portland to London Heathrow Airport

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

Insights shared by verified travellers 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 travellers 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 return 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.

Travelling to a place near Heathrow?

Book flights to Heathrow if you plan to visit one of these locations
Gatwick
Milton Keynes
Eastbourne
Luton
Swindon
Northampton
Southend-on-Sea
Winchester
Slough
Croydon
Stansted
Poole
Chichester
Folkestone
Maidstone
Colchester
Salisbury
Crawley
Chelmsford
Bedford

Everything you need to know for your flight to Heathrow

Information on your arrival and departure airports

London Heathrow Airport (LHR)

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