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Cheap flights from Washington to London Heathrow Airport from £211

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 15/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
20 Aug — 27 Aug1
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 21 July 2026.

Sat 12/923:25
SEA
-
LHR
1 stop28h 30m
Icelandair
Mon 21/921:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Deal found 16/7£481
Fri 11/919:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Thu 24/913:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Deal found 17/7£482
Sat 12/923:25
SEA
-
LHR
1 stop28h 30m
Icelandair
Wed 23/921:25
LHR
-
SEA
1 stop28h 30m
Icelandair
Deal found 18/7£483
Tue 17/1107:48
SEA
-
LHR
2 stops16h 17m
Multiple Airlines
Thu 3/1212:15
LHR
-
SEA
1 stop12h 45m
Multiple Airlines
Deal found 17/7£483
Fri 2/1015:55
SEA
-
LHR
2 stops18h 35m
Scandinavian Airlines
Sun 4/1010:20
LHR
-
SEA
2 stops21h 00m
Scandinavian Airlines
Deal found 19/7£484
Tue 20/1008:00
SEA
-
LHR
2 stops16h 05m
Multiple Airlines
Fri 30/1012:15
LHR
-
SEA
1 stop12h 45m
Multiple Airlines
Deal found 16/7£485
Tue 29/907:52
SEA
-
LHR
2 stops16h 13m
Multiple Airlines
Tue 13/1013:05
LHR
-
SEA
1 stop12h 50m
Multiple Airlines
Deal found 19/7£486
Sun 6/915:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Thu 28/112:15
LHR
-
SEA
1 stop12h 45m
Icelandair
Deal found 16/7£487
Tue 20/1008:00
SEA
-
LHR
2 stops16h 05m
Multiple Airlines
Sat 31/1020:35
LHR
-
SEA
1 stop28h 25m
Multiple Airlines
Deal found 18/7£488
Thu 1/1019:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Sat 10/1021:25
LHR
-
SEA
1 stop28h 30m
Icelandair
Deal found 16/7£489
Wed 23/915:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Sun 4/1013:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Deal found 17/7£491
Sat 26/915:30
PDX
-
LHR
1 stop20h 50m
Icelandair
Thu 8/1021:25
LHR
-
PDX
1 stop28h 30m
Icelandair
Deal found 17/7£634

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 21 July 2026.

Round-trip from

£481

One-way from

£211

Popular in

June

Cheapest in

January

Average price

£768

Good round-trip deal

£732 or less

Good one-way deal

£261 or less
Icelandair
  • Icelandair
  • 12/9-25/9
  • 2 total stops
  • 59h 45m total
  • Washington to London
Search Deals
15/10
  • 15/10
  • 2 total stops
  • 33h 50m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£127 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£20 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 21 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

Sat 26/9

15:55-16:00

1 stop16h 05m

London Heathrow

Tue 29/9

07:05-13:45

2 stops14h 40m

£580

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 15/10

10:55-17:40

2 stops22h 45m

London Heathrow

Sun 18/10

19:50-23:00

2 stops35h 10m

£640

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

£655

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 25/10

13:40-11:40

1 stop15h 00m

London Heathrow

Fri 30/10

12:20-15:50

Nonstop10h 30m

£659

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Mon 11/1

13:23-12:20

1 stop14h 57m

London Heathrow

Wed 13/1

14:45-21:11

1 stop14h 26m

£662

BellinghamLondon

BLI - LHR

BLILHR

Bellingham

Sun 10/1

12:56-12:20

1 stop15h 24m

London Heathrow

Wed 13/1

14:45-23:45

1 stop17h 00m

£669

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 18/8

20:20-13:45

Nonstop9h 25m

London Heathrow

Tue 25/8

13:10-20:52

1 stop15h 42m

£670

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Sun 29/11

13:30-12:20

1 stop14h 50m

London Heathrow

Wed 2/12

14:45-20:55

1 stop14h 10m

£679

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 17/8

18:20-12:10

Nonstop9h 50m

London Heathrow

Mon 24/8

17:35-11:15

1 stop25h 40m

£688

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Thu 19/11

05:00-09:40

1 stop20h 40m

London Heathrow

Wed 25/11

12:05-21:01

2 stops40h 56m

£691

Flights are sorted by cheapest return flights first.

Deals found on 20/7

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 £491). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of £934). 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 21 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 21 July 2026.

The most flights from USWA to LHR are scheduled on a Tuesday (25 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?

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 Delta fly from State of Washington to London Heathrow Airport in about 15h. The time it takes to get you to your destination can typically vary by up to 5h 40m. 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 £127 on Icelandair. Other airlines that offer cheap prices include Virgin Atlantic from £218 and British Airways from £243 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 £199. On average you can expect to pay £536. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for £418.

  • 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 £491). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of £934). 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.
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Newark to Stansted flights
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Dulles Intl to Gatwick flights
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Newark to Luton flights
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Dulles Intl to London City flights
Denver to Heathrow flights
Boston to London City flights
Philadelphia to Heathrow flights
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Boston to Stansted flights
Los Angeles to Gatwick flights
George Bush Intcntl to Heathrow flights
Reagan-National to Gatwick flights
O'Hare Intl to Gatwick flights
Orlando to Gatwick flights
San Francisco to Gatwick flights
Los Angeles to Stansted flights
O'Hare Intl to Stansted flights
Sky Harbor Intl to Heathrow flights
San Francisco to London City flights
Raleigh to Heathrow flights
O'Hare Intl to London City flights
Detroit to Heathrow flights
Tampa to Heathrow flights
Seattle to Gatwick flights
Dallas/Fort Worth to Gatwick 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 21 July 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£353Average£682FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£367Average£588FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Alaska AirlinesCheapest£492Average£732FlexibilityNo 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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