£241 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 26/8. 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

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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 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, 23 Sep - Sun, 4 Oct
Icelandair Logo
15:40 - 11:55
SEA
-
LHR
12h 15m
1 stop
Icelandair Logo
21:25 - 20:40
LHR
-
SEA
31h 15m
1 stop
£605Icelandair
Sun, 16 Aug - Tue, 25 Aug
Icelandair Logo
15:40 - 11:55
SEA
-
LHR
12h 15m
1 stop
Icelandair Logo
21:25 - 11:45
LHR
-
SEA
22h 20m
1 stop
£610Icelandair
Mon, 17 Aug - Tue, 25 Aug
Icelandair Logo
15:40 - 11:55
SEA
-
LHR
12h 15m
1 stop
Icelandair Logo
21:25 - 11:45
LHR
-
SEA
22h 20m
1 stop
£610Icelandair
Tue, 26 May - Mon, 1 Jun
Scandinavian Airlines Logo
15:55 - 16:25
SEA
-
LHR
16h 30m
2 stops
Scandinavian Airlines Logo
10:35 - 13:45
LHR
-
SEA
35h 10m
2 stops
£612Scandinavian Airlines
Sat, 5 Sep - Fri, 18 Sep
Scandinavian Airlines Logo
15:55 - 09:20
SEA
-
LHR
33h 25m
1 stop
Scandinavian Airlines Logo
19:30 - 13:45
LHR
-
SEA
26h 15m
1 stop
£616Scandinavian Airlines
Sat, 3 Oct - Wed, 7 Oct
Lufthansa Logo
13:37 - 09:55
GEG
-
LHR
60h 18m
2 stops
Lufthansa Logo
08:30 - 20:53
LHR
-
GEG
20h 23m
2 stops
£635Lufthansa
Wed, 9 Sep - Wed, 7 Oct
United Airlines Logo
06:00 - 07:25
GEG
-
LHR
17h 25m
1 stop
United Airlines Logo
07:25 - 22:16
LHR
-
GEG
22h 51m
2 stops
£639United Airlines
Wed, 9 Sep - Wed, 7 Oct
United Airlines Logo
05:00 - 12:35
GEG
-
LHR
23h 35m
1 stop
United Airlines Logo
07:25 - 22:16
LHR
-
GEG
22h 51m
2 stops
£642United Airlines
Wed, 12 Aug - Tue, 15 Sep
Iberia Logo
05:40 - 09:00
GEG
-
LHR
19h 20m
1 stop
Iberia Logo
06:15 - 20:47
LHR
-
GEG
22h 32m
2 stops
£643Iberia
Sat, 8 Aug - Tue, 25 Aug
Iberia Logo
13:30 - 06:20
PDX
-
LHR
32h 50m
1 stop
Iberia Logo
12:55 - 21:36
LHR
-
PDX
16h 41m
1 stop
£679Iberia
Useful Info

Good to know - Cheap tickets from Washington to London Heathrow Airport

Low seasonJanuary
Cheapest flight£241
Best time to beat the crowds (8% less expensive on average)
Most popular time to fly (4% more expensive 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 American Airlines
SEA
-
LHR
Apr 2026
Heathrow is too gigantic to have less than 2 hours of layover time.
Verified travelerFlew with British Airways
SEA
-
LHR
Apr 2025
Make sure you have plenty of time between flights if you are delayed.
Verified travelerFlew with British Airways
SEA
-
LHR
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
SEA
-
LHR
Apr 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
Hounslow
Luton
Southend-on-Sea
Northampton
Swindon
Slough
Winchester
Stansted
Croydon
Folkestone
Poole
Chichester
Maidstone
Colchester
Salisbury
Chelmsford
Crawley

Everything you need to know for your flight to Heathrow

Information on your arrival and departure airports

London Heathrow Airport (LHR)