£217 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 24/3. 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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Everything you should know

Cheapest return fare
£408
Overall average: £512
Icelandair
Sun 1/3Thu 5/3
SEA - LHR • 1 stop
Cheapest direct flights
£427
Typical prices: £464-£666
British Airways
Wed 18/2Fri 27/2
SEA - LHR • Direct
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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 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

Sun, 1 Mar - Thu, 5 Mar
Icelandair Logo
14:35 - 10:50
SEA
-
LHR
12h 15m1 stop
Icelandair Logo
12:15 - 17:00
LHR
-
SEA
12h 45m1 stop
£408Icelandair
Sun, 15 Feb - Fri, 27 Feb
British Airways Logo
07:15 - 08:15
SEA
-
LHR
17h 00m1 stop
British Airways Logo
08:50 - 18:20
LHR
-
SEA
17h 30m1 stop
£409British Airways
Tue, 3 Feb - Tue, 10 Feb
Lufthansa Logo
10:05 - 11:50
SEA
-
LHR
17h 45m1 stop
Lufthansa Logo
07:40 - 19:16
LHR
-
SEA
19h 36m2 stops
£413Lufthansa
Sun, 1 Feb - Tue, 10 Feb
Lufthansa Logo
10:05 - 11:50
SEA
-
LHR
17h 45m1 stop
Lufthansa Logo
06:35 - 19:16
LHR
-
SEA
20h 41m2 stops
£416Lufthansa
Tue, 24 Feb - Tue, 10 Mar
Iberia Logo
06:00 - 10:00
GEG
-
LHR
20h 00m1 stop
Iberia Logo
20:50 - 21:12
LHR
-
GEG
31h 22m2 stops
£428Iberia
Wed, 4 Feb - Wed, 11 Feb
Iberia Logo
06:00 - 11:40
GEG
-
LHR
21h 40m1 stop
Iberia Logo
20:50 - 21:12
LHR
-
GEG
32h 22m2 stops
£429Iberia
Sun, 22 Feb - Sun, 1 Mar
KLM Logo
06:45 - 07:05
GEG
-
LHR
16h 20m1 stop
KLM Logo
08:40 - 19:57
LHR
-
GEG
19h 17m2 stops
£443KLM
Wed, 25 Feb - Wed, 4 Mar
Multiple Airlines Logo
05:05 - 10:30
PSC
-
LHR
21h 25m1 stop
Multiple Airlines Logo
06:20 - 17:00
LHR
-
PSC
18h 40m2 stops
£446Multiple Airlines
Tue, 17 Mar - Tue, 31 Mar
KLM Logo
05:25 - 10:30
PSC
-
LHR
22h 05m1 stop
KLM Logo
06:30 - 16:39
LHR
-
PSC
18h 09m2 stops
£448KLM
Thu, 19 Feb - Wed, 25 Feb
Multiple Airlines Logo
11:53 - 12:20
BLI
-
LHR
16h 27m1 stop
Multiple Airlines Logo
12:50 - 11:13
LHR
-
BLI
30h 23m2 stops
£548Multiple Airlines
Useful Info

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

Low seasonJanuary
Cheapest flight£217
Best time to beat the crowds (2% less expensive on average)
Most popular time to fly (9% 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 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
Swindon
Northampton
Slough
Winchester
Croydon
Stansted
Poole
Folkestone
Chichester
Maidstone
Salisbury
Colchester
Chelmsford
Crawley

Everything you need to know for your flight to Heathrow

Information on your arrival and departure airports

London Heathrow Airport (LHR)