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Cheap flights from Washington to London Heathrow Airport from £185

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 23/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
2 Sep — 9 Sep1
1 adult

Cheap flight deals from Washington to Heathrow

Keep the following information in mind while searching for Washington to Heathrow flight deals. Data was last updated 28 August 2025.

Round-trip from

£372

One-way from

£185

Popular in

June

Cheapest in

October

Average price

£512

Good round-trip deal

£526 or less

Good one-way deal

£354 or less
Icelandair
  • Icelandair
  • 10/10-21/10
  • 2 total stops
  • 45h 45m total
  • Washington to London
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WestJet
  • WestJet
  • 23/11
  • 2 total stops
  • 16h 55m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£76 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
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Price to beat on a round-trip flight from Washington to London Heathrow.
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Price to beat on a one-way flight from Washington to London Heathrow.
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Find flight deals from Washington to Heathrow

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 28 August 2025.

Mon 29/919:00SEA - LHR
1 stop32h 55mIcelandair
Sun 5/1021:25LHR - SEA
1 stop31h 15mIcelandair
Deal found 26/8£372
Wed 24/915:45SEA - LHR
1 stop12h 10mIcelandair
Sun 12/1013:05LHR - SEA
1 stop15h 35mIcelandair
Deal found 25/8£373
Wed 24/915:45SEA - LHR
1 stop12h 10mIcelandair
Sat 11/1021:25LHR - SEA
1 stop28h 25mIcelandair
Deal found 25/8£373
Wed 24/915:45SEA - LHR
1 stop12h 10mIcelandair
Wed 15/1013:05LHR - SEA
1 stop12h 45mIcelandair
Deal found 26/8£374
Tue 23/919:00SEA - LHR
1 stop17h 20mIcelandair
Tue 30/921:25LHR - SEA
1 stop31h 15mIcelandair
Deal found 24/8£375
Sat 27/919:00SEA - LHR
1 stop32h 55mIcelandair
Fri 10/1021:25LHR - SEA
1 stop31h 15mIcelandair
Deal found 25/8£376
Tue 9/919:00SEA - LHR
1 stop17h 20mIcelandair
Thu 9/1013:05LHR - SEA
1 stop15h 35mIcelandair
Deal found 26/8£376
Wed 3/920:25SEA - LHR
Nonstop9h 50mDelta
Tue 23/906:15LHR - SEA
1 stop19h 25mDelta
Deal found 26/8£377
Tue 9/917:35SEA - LHR
Nonstop9h 45mDelta
Tue 16/908:40LHR - SEA
1 stop15h 25mDelta
Deal found 26/8£378
Wed 10/923:30SEA - LHR
1 stop28h 25mIcelandair
Thu 25/913:05LHR - SEA
1 stop12h 45mIcelandair
Deal found 25/8£379
Fri 12/923:30SEA - LHR
1 stop12h 50mIcelandair
Sun 28/921:25LHR - SEA
1 stop31h 15mIcelandair
Deal found 26/8£379
Wed 10/913:35SEA - LHR
1 stop18h 05mDelta
Thu 18/911:30LHR - SEA
1 stop14h 10mDelta
Deal found 25/8£380

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 28 August 2025.
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

Mon 27/10

20:20-12:50

Nonstop9h 30m

London Heathrow

Fri 7/11

06:20-13:20

1 stop15h 00m

£377

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 12/11

16:48-10:30

Nonstop9h 42m

London Heathrow

Thu 20/11

06:20-11:25

1 stop13h 05m

£377

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 9/11

16:48-10:30

Nonstop9h 42m

London Heathrow

Wed 19/11

06:20-13:20

1 stop15h 00m

£377

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 5/10

20:25-14:15

Nonstop9h 50m

London Heathrow

Wed 15/10

06:15-11:15

1 stop13h 00m

£377

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 9/9

17:35-11:20

Nonstop9h 45m

London Heathrow

Tue 16/9

08:40-16:05

1 stop15h 25m

£378

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 1/10

17:35-11:20

Nonstop9h 45m

London Heathrow

Fri 10/10

06:30-11:50

1 stop13h 20m

£378

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 10/9

13:35-15:40

1 stop18h 05m

London Heathrow

Thu 18/9

11:30-17:40

1 stop14h 10m

£380

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 10/9

07:13-07:15

1 stop16h 02m

London Heathrow

Wed 17/9

06:15-17:40

1 stop19h 25m

£380

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 10/9

17:45-15:40

1 stop13h 55m

London Heathrow

Wed 17/9

06:15-11:15

1 stop13h 00m

£381

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 6/10

17:15-15:40

1 stop14h 25m

London Heathrow

Wed 15/10

06:15-11:15

1 stop13h 00m

£381

Flights are sorted by cheapest return flights first.

Deals found on 26/8

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, January is the cheapest month in which you can book a flight from State of Washington to London Heathrow Airport (average of £112). Flying from State of Washington to London Heathrow Airport in August is currently the most expensive (average of £164). 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 28 August 2025.

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 28 August 2025.

The most flights from USWA to LHR are scheduled on a Monday (21 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 on average).

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 American Airlines 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 6h 33m. 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: Aeromexico (88%), KLM (87%), Air France (87%).

  • 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 £296. On average you can expect to pay £509. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for £349.

  • 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 £112). Flying from State of Washington to London Heathrow Airport in August is currently the most expensive (average of £164). 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
Croydon
Hounslow
Gatwick
Slough
Northampton
Luton
Deal
Wembley
Ilford
Crawley
Hayes
Watford
Folkestone
Ipswich
Chichester
Winchester
Eastbourne
Swindon
Dartford

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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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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 28 August 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£352Average£680FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£400Average£617FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
IcelandairCheapest£410Average£568FlexibilityNo cancel feeOn-time76%
Search Icelandair 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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