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Cheap flights from Washington to London Heathrow Airport from £210

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 21/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
26 Aug — 2 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Washington to Heathrow

Enter your travel dates to find the best prices.

Cheapest flights from Washington to Heathrow
Explore the most affordable flight options available from Washington to Heathrow. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 27 July 2026.

Mon 9/1108:18
SEA
-
LHR
2 stops15h 47m
Multiple Airlines
Mon 16/1112:15
LHR
-
SEA
1 stop12h 45m
Multiple Airlines
Deal found 25/7£485
Mon 12/1008:00
SEA
-
LHR
2 stops16h 05m
Multiple Airlines
Tue 20/1013:05
LHR
-
SEA
1 stop15h 35m
Multiple Airlines
Deal found 25/7£485
Tue 6/1008:00
SEA
-
LHR
2 stops16h 05m
Multiple Airlines
Tue 13/1013:05
LHR
-
SEA
1 stop12h 50m
Multiple Airlines
Deal found 24/7£486
Fri 18/915:55
SEA
-
LHR
2 stops33h 00m
Scandinavian Airlines
Mon 21/906:40
LHR
-
SEA
2 stops24h 40m
Scandinavian Airlines
Deal found 26/7£487
Tue 18/808:00
SEA
-
LHR
2 stops29h 20m
Multiple Airlines
Tue 25/806:40
LHR
-
SEA
2 stops22h 27m
Multiple Airlines
Deal found 24/7£488
Tue 29/907:52
SEA
-
LHR
2 stops16h 13m
Multiple Airlines
Mon 19/1021:25
LHR
-
SEA
1 stop31h 15m
Multiple Airlines
Deal found 22/7£488
Tue 17/1108:18
SEA
-
LHR
2 stops15h 47m
Multiple Airlines
Wed 25/1107:40
LHR
-
SEA
1 stop13h 20m
Multiple Airlines
Deal found 24/7£489
Thu 5/1108:18
SEA
-
LHR
2 stops15h 47m
Multiple Airlines
Wed 11/1112:15
LHR
-
SEA
1 stop12h 45m
Multiple Airlines
Deal found 23/7£491
Sat 28/1108:31
SEA
-
LHR
2 stops15h 34m
Multiple Airlines
Mon 7/1212:15
LHR
-
SEA
1 stop13h 40m
Multiple Airlines
Deal found 26/7£492
Thu 29/1008:20
SEA
-
LHR
2 stops17h 45m
Multiple Airlines
Wed 2/1212:15
LHR
-
SEA
1 stop12h 45m
Multiple Airlines
Deal found 24/7£493
Tue 15/915:55
SEA
-
LHR
1 stop33h 25m
Scandinavian Airlines
Fri 18/907:05
LHR
-
SEA
2 stops38h 40m
Scandinavian Airlines
Deal found 26/7£494
Mon 5/1008:00
SEA
-
LHR
2 stops16h 05m
Multiple Airlines
Mon 2/1120:35
LHR
-
SEA
1 stop28h 25m
Multiple Airlines
Deal found 26/7£494

Find flight deals from Washington to Heathrow

Keep the following information in mind while searching for Washington to Heathrow flight deals. Data was last updated 27 July 2026.

Round-trip from

£485

One-way from

£210

Popular in

June

Cheapest in

January

Average price

£784

Good round-trip deal

£715 or less

Good one-way deal

£243 or less
Icelandair
  • Icelandair
  • 9/11-16/11
  • 3 total stops
  • 28h 32m total
  • Washington to London
Search Deals
21/10
  • 21/10
  • 2 total stops
  • 22h 10m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£126 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£19 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals
Price to beat on a round-trip flight from Washington to London Heathrow.
Search Deals
Price to beat on a one-way flight from Washington to London Heathrow.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Washington to Heathrow that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 27 July 2026.
Use the filters below to find and compare flights from Washington to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 14/8

15:55-09:35

2 stops33h 40m

London Heathrow

Sat 22/8

06:40-13:45

1 stop15h 05m

£572

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 11/1

05:00-09:10

2 stops20h 10m

London Heathrow

Wed 13/1

09:00-23:38

2 stops22h 38m

£574

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 27/8

09:10-16:00

2 stops22h 50m

London Heathrow

Sat 5/9

15:35-13:45

2 stops30h 10m

£590

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 30/9

19:00-20:20

1 stop17h 20m

London Heathrow

Mon 12/10

21:25-20:40

1 stop31h 15m

£599

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 15/12

14:35-10:50

1 stop12h 15m

London Heathrow

Thu 7/1

12:15-17:00

1 stop12h 45m

£613

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 23/8

15:55-19:55

2 stops20h 00m

London Heathrow

Tue 8/9

19:50-23:20

2 stops35h 30m

£626

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 18/11

05:00-09:40

1 stop20h 40m

London Heathrow

Wed 25/11

06:35-21:01

2 stops22h 26m

£657

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 4/9

23:04-06:55

1 stop23h 51m

London Heathrow

Mon 7/9

06:50-23:44

2 stops24h 54m

£664

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 11/1

13:23-12:20

1 stop14h 57m

London Heathrow

Wed 13/1

14:45-00:18

1 stop17h 33m

£665

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 18/11

08:54-12:20

1 stop19h 26m

London Heathrow

Wed 25/11

14:45-23:54

1 stop17h 09m

£665

Flights are sorted by cheapest return flights first.

Deals found on 24/7

Showing 1-10 of 60 resultsSorted by cheapest first
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Best time to book a flight from Washington to Heathrow

Have a flexible travel schedule? Discover the best time to fly to Heathrow from Washington with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington to London Heathrow Airport

What is the cheapest month to book a flight from State of Washington to London Heathrow Airport?

Currently, January is the cheapest month in which you can book a flight from State of Washington to London Heathrow Airport (average of £494). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of £939). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from WA to LHR?

Find hourly flight availability from Washington to Heathrow. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 27 July 2026.

When flying from State of Washington to London Heathrow Airport, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from State of Washington to London Heathrow Airport

Explore weekly flight availability from Washington to Heathrow. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 27 July 2026.

The most flights from USWA to LHR are scheduled on a Friday (30 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (20 on average).

How much does it cost for a return flight from State of Washington to London Heathrow Airport?

Airfare is typical for this route at the moment.
State of Washington to London Heathrow Airport flights typically cost between £461 and £705 in November.
The cheapest return price found within the last 5 days was £485 on Multiple Airlines (9 Nov–16 Nov).

How far ahead should I book a flight from State of Washington to London Heathrow Airport?

The price you pay for your flight from State of Washington to London Heathrow Airport may vary depending on when you book. For the best chance of a lower fare, look to book 34 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

Related info for your journey

Find useful and relevant information for your journey from Washington to Heathrow. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from State of Washington to London Heathrow Airport?

    Airlines like Scandinavian Airlines, United Airlines, and Icelandair fly from State of Washington to London Heathrow Airport in about 17h 20m. The time it takes to get you to your destination can typically vary by up to 16h 20m. State of Washington and London Heathrow Airport are separated by a distance of 4783 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines to fly from State of Washington to London Heathrow Airport one-way?

    One-way options have recently been found by users for as low as £128 on Icelandair. Other airlines that offer cheap prices include Virgin Atlantic from £219 and British Airways from £244 one-way.

  • What are the most popular routes from State of Washington to London Heathrow Airport?

    When deciding which route to take from State of Washington to London Heathrow Airport consider Seattle/Tacoma Intl - London Heathrow, Portland - London Heathrow or Spokane - London Heathrow as they are the most popular.

  • What are the most reliable airlines from State of Washington to London Heathrow Airport?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from State of Washington to London Heathrow Airport on time: KLM (82%), Air France (82%), Delta (82%).

  • What are the cheapest flights from State of Washington to London Heathrow Airport?

    The cheapest flight price from State of Washington to London Heathrow Airport is £200. On average you can expect to pay £539. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for £423.

  • Can I find deals for flights from Washington to Heathrow that include hotel bookings?

    Yes. In addition to deals on Washington to Heathrow flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Washington to Heathrow?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to Heathrow.

  • Can I find deals for business class flights from Washington to Heathrow?

    Yes. Cheapflights offers flight deals from Washington to Heathrow by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from State of Washington to London Heathrow Airport?

    Currently, January is the cheapest month in which you can book a flight from State of Washington to London Heathrow Airport (average of £494). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of £939). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Travelling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Milton Keynes
Luton
Wembley
Gatwick
Slough
Ilford
Hayes
Croydon
Colchester
Brentford
Eastbourne
Northampton
Watford
Swindon
Southend-on-Sea
Poole
Kingston upon Thames
Southall
Aylesbury

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Washington to Heathrow

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
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John F Kennedy Intl to London City flights
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Baltimore to Heathrow flights
Los Angeles to Heathrow flights
O'Hare Intl to Heathrow flights
San Francisco to Heathrow flights
LaGuardia to Gatwick flights
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Dallas/Fort Worth to Heathrow flights
Orlando to Heathrow flights
Atlanta to Heathrow flights
Newark to London City flights
Newark to Stansted flights
Dulles Intl to Gatwick flights
Reagan-National to Heathrow flights
Boston to Gatwick flights
Miami to Heathrow flights
Hobby to Heathrow flights
Dulles Intl to London City flights
Newark to Luton flights
Boston to London City flights
Boston to Stansted flights
Denver to Heathrow flights
Los Angeles to Gatwick flights
Baltimore to Gatwick flights
Reagan-National to Gatwick flights
O'Hare Intl to Gatwick flights
George Bush Intcntl to Heathrow flights
Los Angeles to Stansted flights
San Francisco to Gatwick flights
Philadelphia to Heathrow flights
Orlando to Gatwick flights
Sky Harbor Intl to Heathrow flights
O'Hare Intl to Stansted flights
San Francisco to London City flights
San Francisco to Stansted flights
O'Hare Intl to London City flights
Seattle to Gatwick flights
Raleigh to Heathrow flights
Minneapolis to Heathrow flights
Los Angeles to London City flights

Top 3 airlines flying from Washington to Heathrow

Discover the top 3 airlines that operate flights from Washington to Heathrow. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 27 July 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£355Average£686FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£369Average£592FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Alaska AirlinesCheapest£495Average£737FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Washington to Heathrow?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Washington to Heathrow. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Washington to Heathrow?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Heathrow from Washington.

Can Cheapflights find flights from Washington to Heathrow with no change fees?

Need flexible booking options for your flight to Heathrow from Washington? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

Can Cheapflights notify me if prices for flights from Washington to Heathrow become cheaper?

Of course! You can now track prices for flights from Washington to Heathrow and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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