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$293+ 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 2/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
Jan 22 — Jan 291
Thu 1/22
Thu 1/29
1 adult, Economy
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Cheap 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 December 23, 2025.

This Kiwi.com deal was found by Cheapflights users on 12/21. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/302:35 pmSEA - LHR
1 stop12h 15mIcelandair
Thu 1/2212:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 12/21$636
This KAYAK deal was found by Cheapflights users on 12/21. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/292:35 pmSEA - LHR
1 stop20h 55mIcelandair
Wed 1/2112:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 12/21$638
This KAYAK deal was found by Cheapflights users on 12/21. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/302:35 pmSEA - LHR
1 stop12h 15mIcelandair
Mon 1/198:35 pmLHR - SEA
1 stop28h 25mIcelandair
Deal found 12/21$640
This Trip.com deal was found by Cheapflights users on 12/22. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/292:35 pmSEA - LHR
1 stop20h 55mIcelandair
Mon 1/128:35 pmLHR - SEA
1 stop28h 25mIcelandair
Deal found 12/22$658
This Delta deal was found by Cheapflights users on 12/21. 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.
Mon 12/296:50 amPDX - LHR
1 stop22h 00mDelta
Fri 1/236:30 amLHR - PDX
1 stop12h 55mDelta
Deal found 12/21$750
This KAYAK deal was found by Cheapflights users on 12/21. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/297:30 amPDX - LHR
1 stop20h 30mLufthansa
Fri 1/236:35 amLHR - PDX
2 stops19h 55mLufthansa
Deal found 12/21$754
This Delta deal was found by Cheapflights users on 12/21. 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 12/305:30 amPDX - LHR
2 stops17h 35mDelta
Wed 1/216:30 amLHR - PDX
1 stop12h 55mDelta
Deal found 12/21$755
This United Airlines deal was found by Cheapflights users on 12/21. 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 12/299:00 amPDX - LHR
1 stop16h 40mUnited Airlines
Tue 1/2011:10 amLHR - PDX
2 stops21h 29mUnited Airlines
Deal found 12/21$759
This Air Canada deal was found by Cheapflights users on 12/21. 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.
Tue 12/303:15 pmPDX - LHR
2 stops34h 05mAir Canada
Thu 1/222:30 pmLHR - PDX
2 stops32h 16mAir Canada
Deal found 12/21$760
This Delta deal was found by Cheapflights users on 12/21. 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.
Sun 12/287:30 pmPDX - LHR
1 stop31h 00mDelta
Wed 1/216:30 amLHR - PDX
1 stop12h 55mDelta
Deal found 12/21$761
This Cheapflightsfares deal was found by Cheapflights users on 12/23. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/307:30 amPDX - LHR
1 stop20h 30mLufthansa
Sun 2/88:45 amLHR - PDX
2 stops23h 54mLufthansa
Deal found 12/23$763
This United Airlines deal was found by Cheapflights users on 12/21. 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.
Sun 12/287:45 pmPDX - LHR
1 stop27h 40mUnited Airlines
Fri 1/2311:10 amLHR - PDX
2 stops21h 33mUnited Airlines
Deal found 12/21$765

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 December 23, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$575
(Cheapflightsfares)

One-way from

$293
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$986

Good round-trip deal

$633 or less

Good one-way deal

$383 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-London (LON) flights.
Search Deals
From Washington to London Heathrow
Search Deals
One-way flight from Washington to London Heathrow
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($140 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT 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

 
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 December 23, 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

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 3/4

12:38 pm-12:00 pm

1 stop15h 22m

London Heathrow

Mon 3/9

7:40 am-9:18 pm

2 stops20h 38m

$597

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 2/25

1:44 pm-5:05 pm

2 stops19h 21m

London Heathrow

Wed 3/11

7:40 am-9:03 pm

2 stops20h 23m

$605

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 2/24

1:44 pm-7:35 pm

2 stops21h 51m

London Heathrow

Tue 3/10

6:35 am-9:18 pm

2 stops21h 43m

$605

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 2/4

4:55 pm-10:30 am

Nonstop9h 35m

London Heathrow

Wed 2/11

6:30 am-11:40 am

1 stop13h 10m

$615

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sat 2/7

6:25 pm-11:55 am

Nonstop9h 30m

London Heathrow

Sat 2/14

6:30 am-11:40 am

1 stop13h 10m

$615

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 2/17

6:25 pm-11:55 am

Nonstop9h 30m

London Heathrow

Sun 3/1

6:30 am-11:35 am

1 stop13h 05m

$615

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 3/8

5:40 pm-10:30 am

Nonstop9h 50m

London Heathrow

Wed 3/18

6:20 am-2:05 pm

1 stop14h 45m

$620

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 1/19

6:25 pm-11:55 am

Nonstop9h 30m

London Heathrow

Mon 2/2

6:20 am-1:20 pm

1 stop15h 00m

$620

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 2/6

9:25 am-1:30 pm

2 stops20h 05m

London Heathrow

Fri 2/13

6:35 am-1:20 pm

1 stop14h 45m

$623

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Thu 2/5

5:50 am-11:50 am

1 stop22h 00m

London Heathrow

Thu 2/12

11:10 am-1:20 pm

1 stop34h 10m

$624

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/20

Showing 1-10 of 55 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, October is the cheapest month in which you can book a flight from State of Washington to London Heathrow Airport (average of $498). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of $790). 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 December 23, 2025.

When flying from State of Washington to London Heathrow Airport, the time of day you fly usually plays a role in the price. Save by searching for a flight in the afternoon, which can drop the price by up to 8% versus a flight in the morning.

What is the cheapest day to fly from State of Washington to London Heathrow Airport?

Use this chart to determine the cheapest time to fly round-trip from Washington to Heathrow. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their State of Washington to London Heathrow Airport flight should consider departing on Wednesday at noon when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 December 23, 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 to fly round-trip 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?

    There are many flights that can get you from State of Washington to London Heathrow Airport in 9h 30m. Fly via Lufthansa, KLM, or Delta to get the fastest option. There are 4783 mi between State of Washington and London Heathrow Airport. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    $166 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on WestJet and Aer Lingus, with prices starting from $222 and $362, 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 Air France (81%), KLM (81%) or Delta (80%) 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 $2,249 for a flight from State of Washington to London Heathrow Airport. The cheapest flight overall is $334 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at $477.

  • 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, October is the cheapest month in which you can book a flight from State of Washington to London Heathrow Airport (average of $498). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of $790). 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
Ilford
Hounslow
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Winchester
Croydon
Hayes
Orpington
Northampton
Watford
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames
Folkestone

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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 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 December 23, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$465Average$718FlexibilityNo cancel feeOn-time77%
IcelandairCheapest$481Average$630FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$500Average$700FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$517Average$817FlexibilityNo cancel feeOn-time71%
Air FranceCheapest$532Average$765FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$544Average$783FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$547Average$892FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$553Average$999FlexibilityNo cancel feeOn-time75%
FinnairCheapest$556Average$694FlexibilityNo cancel feeOn-time76%
DeltaCheapest$563Average$858FlexibilityNo cancel feeOn-timeN/A

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