£220 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 28/2. 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
£400
Overall average: £535
Icelandair
Mon 13/4Mon 20/4
SEA - LHR • 1 stop
Cheapest direct flights
£467
Typical prices: £453-£602
British Airways
Sun 8/3Wed 18/3
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

Mon, 13 Apr - Mon, 20 Apr
Icelandair Logo
15:40 - 20:20
SEA
-
LHR
20h 40m
1 stop
Icelandair Logo
13:05 - 20:40
LHR
-
SEA
15h 35m
1 stop
£400Icelandair
Mon, 13 Apr - Wed, 22 Apr
Icelandair Logo
15:40 - 20:20
SEA
-
LHR
20h 40m
1 stop
Icelandair Logo
13:05 - 20:40
LHR
-
SEA
15h 35m
1 stop
£400Icelandair
Fri, 6 Mar - Mon, 9 Mar
United Airlines Logo
07:02 - 12:00
GEG
-
LHR
20h 58m
1 stop
United Airlines Logo
07:40 - 21:03
LHR
-
GEG
20h 23m
2 stops
£465United Airlines
Fri, 6 Mar - Mon, 9 Mar
United Airlines Logo
18:37 - 21:20
GEG
-
LHR
18h 43m
2 stops
United Airlines Logo
07:40 - 21:03
LHR
-
GEG
20h 23m
2 stops
£469United Airlines
Sat, 7 Mar - Fri, 20 Mar
KLM Logo
09:25 - 10:30
GEG
-
LHR
17h 05m
1 stop
KLM Logo
10:45 - 21:37
LHR
-
GEG
17h 52m
1 stop
£475KLM
Tue, 5 May - Thu, 14 May
Delta Logo
12:28 - 12:10
PSC
-
LHR
15h 42m
1 stop
Delta Logo
06:30 - 14:50
LHR
-
PSC
16h 20m
2 stops
£476Delta
Sun, 26 Apr - Fri, 15 May
Delta Logo
19:38 - 15:35
GEG
-
LHR
11h 57m
1 stop
Delta Logo
08:40 - 21:13
LHR
-
GEG
20h 33m
2 stops
£476Delta
Sun, 8 Mar - Sun, 15 Mar
Air Canada Logo
06:00 - 11:20
GEG
-
LHR
22h 20m
2 stops
Air Canada Logo
13:25 - 21:59
LHR
-
GEG
39h 34m
2 stops
£477Air Canada
Wed, 22 Apr - Fri, 8 May
Air Canada Logo
07:10 - 08:35
GEG
-
LHR
17h 25m
2 stops
Air Canada Logo
14:05 - 18:36
LHR
-
GEG
36h 31m
2 stops
£482Air Canada
Tue, 24 Mar - Tue, 31 Mar
KLM Logo
12:13 - 10:00
PSC
-
LHR
14h 47m
1 stop
KLM Logo
09:55 - 19:56
LHR
-
PSC
18h 01m
2 stops
£543KLM
Useful Info

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

Low seasonJanuary
Cheapest flight£220
Best time to beat the crowds (6% less expensive on average)
Most popular time to fly (8% 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
Folkestone
Poole
Maidstone
Chichester
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)