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Cheap flights from Washington to London Heathrow Airport from £217

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 20/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
25 Feb — 4 Mar1
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 26 January 2026.

Mon 20/415:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Wed 6/513:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Deal found 25/1£403
Wed 25/214:35
SEA
-
LHR
1 stop20h 55m
Icelandair
Wed 11/312:15
LHR
-
SEA
1 stop12h 45m
Icelandair
Deal found 24/1£404
Thu 23/415:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Sun 10/521:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Deal found 25/1£404
Wed 4/314:35
SEA
-
LHR
1 stop12h 15m
Icelandair
Sun 8/312:15
LHR
-
SEA
1 stop12h 45m
Icelandair
Deal found 26/1£405
Tue 17/315:35
SEA
-
LHR
1 stop20h 55m
Icelandair
Thu 26/320:35
LHR
-
SEA
1 stop31h 10m
Icelandair
Deal found 25/1£406
Tue 3/214:35
SEA
-
LHR
1 stop20h 55m
Icelandair
Wed 11/220:35
LHR
-
SEA
1 stop28h 25m
Icelandair
Deal found 24/1£407
Thu 30/415:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Mon 11/521:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Deal found 23/1£407
Tue 17/315:35
SEA
-
LHR
1 stop20h 55m
Icelandair
Wed 25/320:35
LHR
-
SEA
1 stop28h 25m
Icelandair
Deal found 25/1£408
Fri 1/519:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Wed 20/513:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Deal found 26/1£409
Tue 5/519:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Sun 10/521:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Deal found 26/1£409
Wed 23/915:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Wed 30/921:25
LHR
-
SEA
1 stop28h 30m
Icelandair
Deal found 24/1£411
Wed 11/309:55
SEA
-
LHR
1 stop15h 50m
Virgin Atlantic
Wed 18/312:20
LHR
-
SEA
Nonstop10h 20m
Virgin Atlantic
Deal found 25/1£413

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 26 January 2026.

Round-trip from

£403

One-way from

£217

Popular in

June

Cheapest in

October

Average price

£476

Good round-trip deal

£510 or less

Good one-way deal

£340 or less
Icelandair
  • Icelandair
  • 20/4-6/5
  • 2 total stops
  • 36h 15m total
  • Washington to London
Search Deals
20/4
  • 20/4
  • 2 total stops
  • 22h 10m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£73 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 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 26 January 2026.
Use the filters below to find and compare flights from Washington to London Heathrow Airport that are best for you.

Fly from

Washington

Fly to

Heathrow

Route

Depart

Return

Price

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 3/3

14:35-10:50

1 stop12h 15m

London Heathrow

Thu 12/3

12:15-18:00

1 stop12h 45m

£405

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 5/3

14:35-10:50

1 stop12h 15m

London Heathrow

Sun 8/3

12:15-18:00

1 stop12h 45m

£405

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 9/3

19:25-11:55

Nonstop9h 30m

London Heathrow

Thu 19/3

06:30-12:35

1 stop13h 05m

£452

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 3/3

16:45-10:30

Nonstop9h 45m

London Heathrow

Thu 12/3

06:30-12:35

1 stop13h 05m

£452

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 12/3

19:25-11:55

Nonstop9h 30m

London Heathrow

Thu 19/3

06:30-12:35

1 stop13h 05m

£452

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Fri 27/2

07:00-11:50

2 stops20h 50m

London Heathrow

Thu 12/3

07:40-21:18

2 stops20h 38m

£455

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 23/2

11:35-10:30

1 stop14h 55m

London Heathrow

Fri 6/3

06:30-11:25

1 stop12h 55m

£455

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 22/2

16:55-10:30

Nonstop9h 35m

London Heathrow

Sat 7/3

06:20-11:25

1 stop13h 05m

£456

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Wed 11/3

15:05-12:00

1 stop13h 55m

London Heathrow

Wed 18/3

06:35-20:54

2 stops21h 19m

£462

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 24/2

07:00-07:25

1 stop16h 25m

London Heathrow

Tue 10/3

06:35-21:18

2 stops21h 43m

£462

Flights are sorted by cheapest return flights first.

Deals found on 25/1

Showing 1-10 of 60 results
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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, October is the cheapest month in which you can book a flight from State of Washington to London Heathrow Airport (average of £364). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of £578). 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 26 January 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 26 January 2026.

The most flights from USWA to LHR are scheduled on a Saturday (21 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (12 on average).

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

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 Delta, Virgin Atlantic, and KLM fly from State of Washington to London Heathrow Airport in about 9h 30m. The time it takes to get you to your destination can typically vary by up to 5h 25m. 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 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 (81%), Delta (81%), Virgin Atlantic (81%).

  • 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 £217. On average you can expect to pay £509. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for £383.

  • 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, October is the cheapest month in which you can book a flight from State of Washington to London Heathrow Airport (average of £364). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of £578). 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
Milton Keynes
Luton
Croydon
Wembley
Northampton
Gatwick
Slough
Hounslow
Ilford
Brentford
Hayes
Watford
Colchester
Guildford
Swindon
Chelmsford
Bedford
Crawley
Kingston upon Thames
Eastbourne

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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.
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Boston to Gatwick flights
Orlando to Heathrow flights
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Dulles Intl to Gatwick flights
Reagan-National to Heathrow flights
Newark to Stansted flights
Boston to London City flights
Newark to London City flights
Newark to Luton flights
Philadelphia to Heathrow flights
Los Angeles to Gatwick flights
O'Hare Intl to Gatwick flights
Dulles Intl to London City flights
Baltimore to Gatwick flights
George Bush Intcntl to Heathrow flights
Minneapolis to Heathrow flights
San Francisco to Gatwick flights
O'Hare Intl to London City flights
Los Angeles to Stansted flights
Boston to Stansted flights
Reagan-National to Gatwick flights
Los Angeles to London City flights
O'Hare Intl to Stansted flights
Austin to Heathrow flights
Tampa to Heathrow flights
Detroit to Heathrow flights
Dallas/Fort Worth to Gatwick flights
Charlotte to Heathrow flights
San Francisco to London City flights

Top 2 airlines flying from Washington to Heathrow

Discover the top 2 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 26 January 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£347Average£511FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£362Average£576FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic 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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