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Cheap flights from Washington to London Heathrow Airport from £208

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 31/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
11 Dec — 18 Dec1
1 adult
1 adult, Economy, 0 bags

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 11 November 2025.

Round-trip from

£400

One-way from

£208

Popular in

June

Cheapest in

October

Average price

£502

Good round-trip deal

£495 or less

Good one-way deal

£466 or less
Icelandair
  • Icelandair
  • 7/4-19/4
  • 2 total stops
  • 49h 00m total
  • Washington to London
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31/1
  • 31/1
  • 3 total stops
  • 33h 50m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£79 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
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

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 11 November 2025.

Wed 3/1214:35SEA - LHR
1 stop20h 55mIcelandair
Sun 14/1220:35LHR - SEA
1 stop28h 25mIcelandair
Deal found 9/11£408
Tue 25/1114:35SEA - LHR
1 stop12h 15mIcelandair
Tue 2/1220:35LHR - SEA
1 stop28h 25mIcelandair
Deal found 10/11£416
Sun 30/1120:05SEA - LHR
1 stop12h 45mAer Lingus
Wed 10/1209:50LHR - SEA
1 stop16h 30mAer Lingus
Deal found 9/11£419
Wed 12/1120:05SEA - LHR
1 stop11h 30mAer Lingus
Wed 19/1108:50LHR - SEA
1 stop17h 30mAer Lingus
Deal found 9/11£419
Mon 10/1119:20SEA - LHR
Nonstop9h 30mVirgin Atlantic
Tue 25/1106:20LHR - SEA
1 stop13h 05mVirgin Atlantic
Deal found 9/11£421
Sun 16/1114:35SEA - LHR
1 stop12h 15mIcelandair
Sun 23/1112:15LHR - SEA
1 stop12h 45mIcelandair
Deal found 9/11£422
Wed 12/1120:05SEA - LHR
1 stop12h 45mAer Lingus
Fri 14/1108:50LHR - SEA
1 stop17h 30mAer Lingus
Deal found 8/11£423
Wed 19/1115:40SEA - LHR
1 stop12h 10mLufthansa
Wed 26/1106:35LHR - SEA
1 stop14h 45mLufthansa
Deal found 10/11£424
Sun 30/1114:35SEA - LHR
1 stop12h 15mIcelandair
Mon 15/1220:35LHR - SEA
1 stop28h 25mIcelandair
Deal found 9/11£425
Thu 27/1114:45PDX - LHR
1 stop12h 05mIcelandair
Fri 5/1212:15LHR - PDX
1 stop12h 45mIcelandair
Deal found 10/11£432
Wed 12/1110:05SEA - LHR
1 stop17h 45mLufthansa
Wed 19/1107:40LHR - SEA
1 stop13h 40mLufthansa
Deal found 10/11£432
Fri 14/1110:35SEA - LHR
1 stop14h 00mIberia
Thu 20/1112:35LHR - SEA
1 stop18h 43mIberia
Deal found 9/11£433

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 11 November 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

Tue 2/12

16:48-10:30

Nonstop9h 42m

London Heathrow

Thu 11/12

06:30-11:50

1 stop13h 20m

£437

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 10/12

16:48-10:30

Nonstop9h 42m

London Heathrow

Thu 25/12

06:30-11:50

1 stop13h 20m

£437

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 3/12

13:45-10:00

1 stop12h 15m

London Heathrow

Wed 10/12

06:30-11:25

1 stop12h 55m

£441

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 2/12

05:25-10:00

1 stop20h 35m

London Heathrow

Mon 15/12

08:40-11:50

1 stop35h 10m

£441

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 11/1

18:50-12:20

Nonstop9h 30m

London Heathrow

Tue 20/1

14:55-16:55

Nonstop10h 00m

£447

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 12/1

18:50-12:20

Nonstop9h 30m

London Heathrow

Thu 22/1

14:55-16:55

Nonstop10h 00m

£447

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 3/12

10:05-10:00

1 stop15h 55m

London Heathrow

Wed 10/12

06:20-18:50

2 stops20h 30m

£447

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 3/12

07:40-06:50

1 stop15h 10m

London Heathrow

Tue 9/12

15:00-23:23

1 stop16h 23m

£448

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 25/11

06:05-07:05

1 stop17h 00m

London Heathrow

Thu 11/12

06:30-18:55

2 stops20h 25m

£448

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Sun 30/11

23:35-06:25

1 stop22h 50m

London Heathrow

Thu 11/12

06:30-14:55

2 stops16h 25m

£448

Flights are sorted by cheapest return flights first.

Deals found on 10/11

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 £377). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of £601). 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 11 November 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 20% on flights from State of Washington to London Heathrow Airport by exploring options for tickets in the afternoon.

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 11 November 2025.

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).

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, KLM, and British Airways 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 2h 45m. 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 £261 on Scandinavian Airlines. Other airlines that offer cheap prices include Air New Zealand from £298 and Air Canada from £299 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 (89%), Air France (84%), Delta (84%).

  • 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 £391. On average you can expect to pay £529. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for £360.

  • 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 £377). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of £601). 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
Slough
Gatwick
Hounslow
Northampton
Luton
Ilford
Wembley
Deal
Hayes
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Watford
Winchester
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Crawley
Brentford
Romford
Chichester
Ipswich

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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 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 11 November 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£360Average£605FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£375Average£626FlexibilityNo 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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