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$309+ 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 11/24. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
Nov 29 — Dec 61
Sat 11/29
Sat 12/6
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 October 30, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$518
(oojo)

One-way from

$309
(Mytrip)

Popular in

June

Cheapest in

October

Average price

$663

Good round-trip deal

$688 or less

Good one-way deal

$460 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-London (LON) flight deals.
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Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-London (LON) flights.
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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 ($134 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 October 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 October 30, 2025.

This oojo deal was found by Cheapflights users on 10/28. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/42:35 pmSEA - LHR
1 stop20h 55mIcelandair
Tue 11/118:35 pmLHR - SEA
1 stop28h 25mIcelandair
Deal found 10/28$519
This Icelandair deal was found by Cheapflights users on 10/29. 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.
Mon 11/242:35 pmSEA - LHR
1 stop12h 15mIcelandair
Thu 12/412:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 10/29$520
This Icelandair deal was found by Cheapflights users on 10/29. 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.
Mon 11/242:35 pmSEA - LHR
1 stop12h 15mIcelandair
Sat 12/68:35 pmLHR - SEA
1 stop28h 25mIcelandair
Deal found 10/29$522
This oojo deal was found by Cheapflights users on 10/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/82:45 pmPDX - LHR
1 stop12h 05mIcelandair
Thu 11/138:35 pmLHR - PDX
1 stop28h 25mIcelandair
Deal found 10/30$543
This KAYAK deal was found by Cheapflights users on 10/27. 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 11/42:45 pmPDX - LHR
1 stop20h 45mIcelandair
Mon 11/1712:15 pmLHR - PDX
1 stop12h 45mIcelandair
Deal found 10/27$544
This Icelandair deal was found by Cheapflights users on 10/29. 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.
Thu 12/112:35 pmSEA - LHR
1 stop12h 15mIcelandair
Mon 12/1512:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 10/29$544
This Gotogate deal was found by Cheapflights users on 10/30. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/18:05 pmSEA - LHR
1 stop17h 00mAer Lingus
Wed 12/178:50 amLHR - SEA
1 stop17h 30mAer Lingus
Deal found 10/30$548
This Booking.com deal was found by Cheapflights users on 10/30. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/38:05 pmSEA - LHR
1 stop11h 30mAer Lingus
Wed 11/58:50 amLHR - SEA
1 stop13h 20mAer Lingus
Deal found 10/30$554
This Mytrip deal was found by Cheapflights users on 10/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/42:35 pmSEA - LHR
2 stops22h 30mMultiple Airlines
Sun 12/147:50 amLHR - SEA
2 stops17h 10mMultiple Airlines
Deal found 10/29$555
This oojo deal was found by Cheapflights users on 10/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/92:35 pmSEA - LHR
1 stop20h 55mIcelandair
Wed 11/1912:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 10/30$557
This Expedia deal was found by Cheapflights users on 10/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/248:05 pmSEA - LHR
1 stop11h 30mAer Lingus
Fri 12/512:10 pmLHR - SEA
1 stop14h 10mAer Lingus
Deal found 10/29$558
This oojo deal was found by Cheapflights users on 10/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/82:35 pmSEA - LHR
1 stop12h 15mIcelandair
Mon 12/158:35 pmLHR - SEA
1 stop28h 25mIcelandair
Deal found 10/30$559

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 October 30, 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 11/27

2:35 pm-10:50 am

1 stop12h 15m

London Heathrow

Thu 12/4

12:15 pm-5:00 pm

1 stop12h 45m

$520

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 11/26

2:35 pm-10:50 am

1 stop12h 15m

London Heathrow

Thu 12/4

12:15 pm-5:00 pm

1 stop12h 45m

$520

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 4/24

3:45 pm-11:55 am

1 stop12h 10m

London Heathrow

Fri 5/8

1:05 pm-5:50 pm

1 stop12h 45m

$566

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 12/8

7:20 pm-12:50 pm

Nonstop9h 30m

London Heathrow

Wed 12/24

6:30 am-11:50 am

1 stop13h 20m

$581

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 11/3

12:40 am-7:05 am

1 stop22h 25m

London Heathrow

Fri 11/21

6:30 am-11:25 am

1 stop12h 55m

$583

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 11/2

12:40 am-7:05 am

1 stop22h 25m

London Heathrow

Fri 11/14

6:30 am-11:25 am

1 stop12h 55m

$583

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 11/5

1:25 pm-10:00 am

1 stop12h 35m

London Heathrow

Fri 11/14

6:30 am-11:25 am

1 stop12h 55m

$583

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 12/31

12:00 pm-8:45 am

1 stop12h 45m

London Heathrow

Fri 2/20

6:30 am-11:25 am

1 stop12h 55m

$586

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 12/10

1:40 pm-10:00 am

1 stop12h 20m

London Heathrow

Wed 12/24

6:30 am-11:50 am

1 stop13h 20m

$586

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 1/14

10:24 am-6:30 pm

2 stops24h 06m

London Heathrow

Thu 1/29

6:40 am-10:24 pm

2 stops23h 44m

$588

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/29

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 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 $487). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of $792). 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 October 30, 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 at noon, which can drop the price by up to 9% 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.

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 Icelandair, Delta, or Finnair 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?

    $344 is the cheapest one-way deal found within the past few days, from Scandinavian Airlines. You may also be able to find cheap deals on Aer Lingus and Virgin Atlantic, with prices starting from $376 and $383, 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 KLM (86%), Air France (86%) or Delta (86%) 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 $2,242 for a flight from State of Washington to London Heathrow Airport. The cheapest flight overall is $350 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at $478.

  • 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 $487). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of $792). 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
Ilford
Hayes
Southend-on-Sea
Harrow
Croydon
Eastleigh
Dartford
Dover
Winchester
Orpington
Northampton
Gatwick
Borehamwood
Broadway
Aylesbury
Bedford
Chipping Norton
Wembley
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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Philadelphia to Heathrow flights
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LaGuardia to London City flights
Los Angeles to London City flights
Denver to Heathrow flights
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Boston to Stansted flights
George Bush Intcntl to Heathrow flights
Charlotte to Heathrow flights
San Francisco to London City flights
O'Hare Intl to Gatwick flights
O'Hare Intl to London City flights
Minneapolis to Heathrow flights
Dulles Intl to Stansted flights
Sky Harbor Intl to Heathrow flights
Dallas/Fort Worth to Gatwick flights
Boston to Luton flights
Detroit to Heathrow flights
Seattle to Gatwick 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 October 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$465Average$741FlexibilityNo cancel feeOn-time77%
IcelandairCheapest$484Average$639FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$500Average$720FlexibilityNo cancel feeOn-timeN/A
Air FranceCheapest$517Average$751FlexibilityNo cancel feeOn-time77%
American AirlinesCheapest$518Average$934FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$546Average$795FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$547Average$846FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$553Average$999FlexibilityNo cancel feeOn-time75%
FinnairCheapest$556Average$694FlexibilityNo cancel feeOn-time76%
DeltaCheapest$561Average$909FlexibilityNo cancel feeOn-timeN/A

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