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Cheap flights from Washington to London Heathrow Airport from £218

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 4/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
22 Jan — 29 Jan1
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 23 December 2025.

Mon 29/1214:35SEA - LHR
1 stop20h 55mIcelandair
Wed 14/112:15LHR - SEA
1 stop12h 45mIcelandair
Deal found 23/12£471
Tue 30/1214:35SEA - LHR
1 stop12h 15mIcelandair
Thu 22/112:15LHR - SEA
1 stop12h 45mIcelandair
Deal found 21/12£474
Mon 29/1214:35SEA - LHR
1 stop20h 55mIcelandair
Mon 19/120:35LHR - SEA
1 stop28h 25mIcelandair
Deal found 21/12£475
Tue 30/1214:35SEA - LHR
1 stop12h 15mIcelandair
Mon 19/120:35LHR - SEA
1 stop28h 25mIcelandair
Deal found 21/12£476
Mon 29/1214:35SEA - LHR
1 stop20h 55mIcelandair
Mon 12/120:35LHR - SEA
1 stop28h 25mIcelandair
Deal found 22/12£490
Mon 29/1206:50PDX - LHR
1 stop22h 00mDelta
Fri 23/106:30LHR - PDX
1 stop12h 55mDelta
Deal found 21/12£558
Mon 29/1207:30PDX - LHR
1 stop20h 30mLufthansa
Fri 23/106:35LHR - PDX
2 stops19h 55mLufthansa
Deal found 21/12£561
Tue 30/1205:30PDX - LHR
2 stops17h 35mDelta
Tue 20/108:40LHR - PDX
1 stop34h 45mDelta
Deal found 21/12£562
Mon 29/1209:00PDX - LHR
1 stop16h 40mUnited Airlines
Thu 22/106:35LHR - PDX
2 stops20h 20mUnited Airlines
Deal found 21/12£565
Tue 30/1219:00PDX - LHR
2 stops30h 20mAir Canada
Wed 21/114:30LHR - PDX
2 stops30h 03mAir Canada
Deal found 21/12£566
Sun 28/1219:30PDX - LHR
1 stop31h 00mDelta
Thu 22/108:40LHR - PDX
1 stop34h 45mDelta
Deal found 21/12£567
Tue 30/1207:10PDX - LHR
1 stop14h 45mLufthansa
Sun 8/208:45LHR - PDX
2 stops23h 54mLufthansa
Deal found 21/12£568

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 23 December 2025.

Round-trip from

£428

One-way from

£218

Popular in

June

Cheapest in

November

Average price

£734

Good round-trip deal

£587 or less

Good one-way deal

£287 or less
Icelandair
  • Icelandair
  • 20/4-7/5
  • 2 total stops
  • 25h 05m total
  • Washington to London
Search Deals
4/2
  • 4/2
  • 3 total stops
  • 35h 15m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£77 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 December 2025
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 23 December 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

Thu 26/2

18:25-11:55

Nonstop9h 30m

London Heathrow

Mon 2/3

06:30-11:35

1 stop13h 05m

£458

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 18/2

16:55-10:30

Nonstop9h 35m

London Heathrow

Fri 27/2

06:30-11:40

1 stop13h 10m

£458

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 20/1

18:25-11:55

Nonstop9h 30m

London Heathrow

Tue 27/1

06:30-11:50

1 stop13h 20m

£458

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 2/3

16:45-10:30

Nonstop9h 45m

London Heathrow

Fri 13/3

06:30-12:35

1 stop13h 05m

£458

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 5/2

05:50-11:50

1 stop22h 00m

London Heathrow

Thu 12/2

11:10-13:20

1 stop34h 10m

£465

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 3/2

12:24-12:00

1 stop15h 36m

London Heathrow

Tue 10/2

06:35-21:22

2 stops22h 47m

£468

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Wed 25/2

05:05-10:30

1 stop21h 25m

London Heathrow

Wed 4/3

06:30-16:16

2 stops17h 46m

£468

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Thu 5/2

13:00-11:55

1 stop14h 55m

London Heathrow

Thu 12/2

06:30-23:03

2 stops24h 33m

£468

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Mon 2/2

11:35-10:00

1 stop14h 25m

London Heathrow

Mon 9/2

06:30-19:56

2 stops21h 26m

£468

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Thu 12/2

05:05-10:30

1 stop21h 25m

London Heathrow

Fri 20/2

06:30-23:03

2 stops24h 33m

£468

Flights are sorted by cheapest return flights first.

Deals found on 20/12

Showing 1-10 of 57 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 £371). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of £588). 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 23 December 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 23 December 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).

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 KLM, Delta, and United 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 12h 30m. 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 £163 on Icelandair. Other airlines that offer cheap prices include Virgin Atlantic from £292 and British Airways from £293 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: Air France (81%), KLM (81%), Delta (80%).

  • 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 £238. On average you can expect to pay £624. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for £355.

  • 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 £371). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of £588). 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
Hounslow
Northampton
Luton
Gatwick
Wembley
Ilford
Brentford
Colchester
Hayes
Watford
Crawley
Swindon
Bedford
Romford
Chichester
Eastbourne
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 23 December 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£353Average£519FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£368Average£588FlexibilityNo 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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