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Heathrow

$231+ Cheap flights from Washington to Heathrow (LHR)

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 10/15. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
Aug 5 — Aug 121
Tue 8/5
Tue 8/12
1 adult, Economy
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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 July 31, 2025.

Round-trip from

$512
(Delta)

One-way from

$255
(Mytrip)

Popular in

June

Cheapest in

October

Average price

$935

Good round-trip deal

$589 or less

Good one-way deal

$426 or less
From Washington to London Heathrow
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One-way flight from Washington to London Heathrow
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Highest demand for flights based on searches. 15% potential increase in price ($136 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
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Average for round-trip flights in July 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 July 31, 2025.

This Delta deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/23:05 pmSEA - LHR
1 stop15h 30mDelta
Tue 9/306:15 amLHR - SEA
1 stop13h 00mDelta
Deal found 7/31$512
This Virgin Atlantic deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Virgin Atlantic is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/133:15 pmSEA - LHR
1 stop14h 15mVirgin Atlantic
Wed 8/206:15 amLHR - SEA
1 stop13h 00mVirgin Atlantic
Deal found 7/31$513
This British Airways deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/101:30 pmSEA - LHR
Nonstop9h 20mBritish Airways
Wed 9/249:50 amLHR - SEA
Nonstop9h 45mBritish Airways
Deal found 7/29$516
This SWISS deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/114:25 pmSEA - LHR
1 stop16h 00mSWISS
Mon 8/188:05 pmLHR - SEA
2 stops30h 31mSWISS
Deal found 7/29$518
This Air Canada deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/87:15 amSEA - LHR
1 stop18h 20mAir Canada
Wed 10/18:30 amLHR - SEA
2 stops18h 06mAir Canada
Deal found 7/31$521
This Icelandair deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Icelandair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/282:35 pmSEA - LHR
1 stop20h 55mIcelandair
Sun 12/712:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 7/29$522
This United Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/84:55 pmSEA - LHR
2 stops29h 35mUnited Airlines
Fri 9/196:30 amLHR - SEA
2 stops20h 06mUnited Airlines
Deal found 7/31$526
This Air France deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/106:40 pmSEA - LHR
1 stop13h 55mAir France
Tue 8/266:15 amLHR - SEA
1 stop13h 00mAir France
Deal found 7/31$527
This Iberia deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/43:00 pmSEA - LHR
1 stop32h 20mIberia
Fri 10/179:50 amLHR - SEA
Nonstop9h 45mIberia
Deal found 7/29$531
This Lufthansa deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Lufthansa is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/106:50 pmSEA - LHR
1 stop16h 50mLufthansa
Tue 8/199:30 amLHR - SEA
2 stops36h 46mLufthansa
Deal found 7/28$541
This Austrian Airlines deal was found by Cheapflights users on 7/31. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Austrian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/237:00 amSEA - LHR
2 stops27h 40mAustrian Airlines
Tue 9/307:30 pmLHR - SEA
2 stops33h 14mAustrian Airlines
Deal found 7/31$542
This Air Canada deal was found by Cheapflights users on 7/29. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/267:15 amSEA - LHR
1 stop18h 20mMultiple Airlines
Tue 10/78:45 amLHR - SEA
2 stops17h 51mMultiple Airlines
Deal found 7/29$549

Cheapflights Fare Finder

 
Customize 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 2,558,603 searches. Data last updated July 31, 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 9/2

3:05 pm-2:35 pm

1 stop15h 30m

London Heathrow

Tue 9/30

6:15 am-11:15 am

1 stop13h 00m

$512

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 8/13

3:15 pm-1:30 pm

1 stop14h 15m

London Heathrow

Wed 8/20

6:15 am-11:15 am

1 stop13h 00m

$513

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 9/10

1:30 pm-6:50 am

Nonstop9h 20m

London Heathrow

Wed 9/24

9:50 am-11:35 am

Nonstop9h 45m

$516

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 8/11

4:25 pm-4:25 pm

1 stop16h 00m

London Heathrow

Mon 8/18

8:05 pm-6:36 pm

2 stops30h 31m

$518

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 9/3

2:29 pm-2:10 pm

1 stop15h 41m

London Heathrow

Tue 9/16

9:30 am-7:31 pm

1 stop18h 01m

$519

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 9/8

7:15 am-9:35 am

1 stop18h 20m

London Heathrow

Wed 10/1

8:30 am-6:36 pm

2 stops18h 06m

$521

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 11/28

2:35 pm-7:30 pm

1 stop20h 55m

London Heathrow

Sun 12/7

12:15 pm-5:00 pm

1 stop12h 45m

$522

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 8/10

6:40 pm-4:35 pm

1 stop13h 55m

London Heathrow

Tue 8/26

6:15 am-11:15 am

1 stop13h 00m

$527

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 10/4

3:00 pm-7:20 am

1 stop32h 20m

London Heathrow

Fri 10/17

9:50 am-11:35 am

Nonstop9h 45m

$531

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 8/10

6:50 pm-7:40 pm

1 stop16h 50m

London Heathrow

Tue 8/19

9:30 am-2:16 pm

2 stops36h 46m

$541

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/29

Showing 1-10 of 46 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 round-trip 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, November is the cheapest month in which you can book a flight from State of Washington to London Heathrow Airport (average of $661). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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 July 31, 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 July 31, 2025.

The most flights from USWA to LHR are scheduled on a Monday (22 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 on average).

Reviews of airlines servicing Heathrow

Get insights into the airlines that provide service to Heathrow. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Heathrow. Reviews last updated July 31, 2025.
Peruse reviews from past customers who have flown with Delta, Alaska Airlines, and KLM from Washington to London Heathrow Airport to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,981 reviews

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,981 reviews
Delta
8.0
Very good
7,981 reviews

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Alaska Airlines
8.0
Very good
10,000 reviews
Delta
8.0
Very good
7,981 reviews

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,383 reviews
Delta
8.0
Very good
7,981 reviews

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Austrian Airlines
7.6
Good
823 reviews
Delta
8.0
Very good
7,981 reviews

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,316 reviews
Delta
8.0
Very good
7,981 reviews

Entertainment

7.9

Boarding

8.2

Food

7.3

Overall

8.0

Crew

8.5

Comfort

7.9

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

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.

  • What are the cheapest airlines to fly from State of Washington to London Heathrow Airport one-way?

    $258 is the cheapest one-way deal found within the past few days, from WestJet. You may also be able to find cheap deals on Icelandair and Air Canada, with prices starting from $331 and $370, respectively.

  • What are the most popular routes from State of Washington to London Heathrow Airport?

    While some choose either Portland - London Heathrow or Spokane - London Heathrow, Seattle/Tacoma Intl - London Heathrow is the most popular route from State of Washington to London Heathrow Airport.

  • What are the most reliable airlines from State of Washington to London Heathrow Airport?

    No one likes to see their flight delayed. When booking a flight from State of Washington to London Heathrow Airport consider choosing Scandinavian Airlines (92%), KLM (91%) or Air France (91%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from State of Washington to London Heathrow Airport?

    On average you can expect to pay $2,488 for a flight from State of Washington to London Heathrow Airport. The cheapest flight overall is $341 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at $471.

  • 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 vacation 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, November is the cheapest month in which you can book a flight from State of Washington to London Heathrow Airport (average of $661). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of $1,097). 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

Traveling to a place near London Heathrow Airport?

Book flights to London Heathrow Airport if you plan to visit one of these locations
Hounslow
Hayes
Thornton Heath
Harrow
Canterbury
Dover
Stratford-upon-Avon
Orpington
Watford
Northampton
Gatwick
Borehamwood
Dartford
Broadway
Aylesbury
Chelmsford
Folkestone
Southend-on-Sea
Chichester
Swindon

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.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
John F Kennedy Intl to Gatwick flights
John F Kennedy Intl to London City flights
Newark to Gatwick flights
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Newark to London City flights
John F Kennedy Intl to Stansted flights
LaGuardia to Gatwick flights
Boston to Heathrow flights
O'Hare Intl to Heathrow flights
John F Kennedy Intl to Luton flights
Dulles Intl to Heathrow flights
Los Angeles to Heathrow flights
Newark to Stansted flights
San Francisco to Heathrow flights
Seattle to Heathrow flights
Baltimore to Heathrow flights
Newark to Luton flights
Dallas/Fort Worth to Heathrow flights
Miami to Heathrow flights
Boston to Gatwick flights
Philadelphia to Heathrow flights
Atlanta to Heathrow flights
Orlando to Heathrow flights
Hobby to Heathrow flights
Reagan-National to Heathrow flights
Denver to Heathrow flights
O'Hare Intl to Gatwick flights
Boston to London City flights
Dulles Intl to Gatwick flights
O'Hare Intl to London City flights
Dulles Intl to London City flights
Seattle to Gatwick flights
Los Angeles to London City flights
Baltimore to Gatwick flights
San Francisco to Gatwick flights
LaGuardia to Stansted flights
Reagan-National to Gatwick flights
George Bush Intcntl to Heathrow flights
San Francisco to London City flights
Dallas/Fort Worth to Gatwick flights
Los Angeles to Gatwick flights
Orlando to Gatwick flights
Seattle to London City flights
Minneapolis to Heathrow flights
Tampa to Heathrow flights
Midway to Heathrow flights
Charlotte to Heathrow flights
Detroit to Heathrow flights

Top 10 airlines flying from Washington to Heathrow

Discover the top 10 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 2,558,603 searches. Data last updated July 31, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$378Average$824FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$503Average$656FlexibilityNo cancel feeOn-time76%
Scandinavian AirlinesCheapest$532Average$741FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$547Average$851FlexibilityNo cancel feeOn-time69%
FinnairCheapest$556Average$729FlexibilityNo cancel feeOn-time76%
Air FranceCheapest$565Average$845FlexibilityNo cancel feeOn-time77%
IberiaCheapest$578Average$728FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$580Average$823FlexibilityNo cancel feeOn-time70%
Aer LingusCheapest$583Average$781FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$596Average$797FlexibilityNo cancel feeOn-time75%

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