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Heathrow

$285+ 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 5/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
Mar 7 — Mar 141
Sat 3/7
Sat 3/14
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 February 5, 2026.

This Gotogate deal was found by Cheapflights users on 2/3. 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 4/137:00 pm
SEA
-
LHR
1 stop17h 20m
Icelandair
Fri 4/249:25 pm
LHR
-
SEA
1 stop28h 30m
Icelandair
Deal found 2/3$544
This oojo deal was found by Cheapflights users on 2/4. 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 4/133:40 pm
SEA
-
LHR
1 stop20h 40m
Icelandair
Mon 4/201:05 pm
LHR
-
SEA
1 stop15h 35m
Icelandair
Deal found 2/4$545
This oojo deal was found by Cheapflights users on 2/3. 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 4/137:00 pm
SEA
-
LHR
1 stop17h 20m
Icelandair
Sat 4/259:25 pm
LHR
-
SEA
1 stop31h 15m
Icelandair
Deal found 2/3$547
This oojo deal was found by Cheapflights users on 2/3. 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.
Wed 10/77:00 pm
SEA
-
LHR
1 stop17h 20m
Icelandair
Tue 10/139:25 pm
LHR
-
SEA
1 stop31h 15m
Icelandair
Deal found 2/3$549
This FlightHub deal was found by Cheapflights users on 2/3. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/143:40 pm
SEA
-
LHR
1 stop12h 15m
Icelandair
Mon 4/201:05 pm
LHR
-
SEA
1 stop15h 35m
Icelandair
Deal found 2/3$550
This Kiwi.com deal was found by Cheapflights users on 2/2. 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.
Mon 2/232:35 pm
SEA
-
LHR
1 stop12h 15m
Icelandair
Sun 3/18:35 pm
LHR
-
SEA
1 stop28h 25m
Icelandair
Deal found 2/2$551
This Kiwi.com deal was found by Cheapflights users on 2/3. 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.
Fri 2/272:35 pm
SEA
-
LHR
1 stop12h 15m
Icelandair
Thu 3/128:35 pm
LHR
-
SEA
1 stop28h 25m
Icelandair
Deal found 2/3$552
This Kiwi.com deal was found by Cheapflights users on 2/3. 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.
Mon 3/22:35 pm
SEA
-
LHR
1 stop12h 15m
Icelandair
Thu 3/1212:15 pm
LHR
-
SEA
1 stop12h 45m
Icelandair
Deal found 2/3$553
This oojo deal was found by Cheapflights users on 2/3. 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 4/203:40 pm
SEA
-
LHR
1 stop12h 15m
Icelandair
Thu 5/71:05 pm
LHR
-
SEA
1 stop12h 50m
Icelandair
Deal found 2/3$554
This Kiwi.com deal was found by Cheapflights users on 2/3. 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.
Fri 2/272:35 pm
SEA
-
LHR
1 stop12h 15m
Icelandair
Fri 3/68:35 pm
LHR
-
SEA
1 stop28h 25m
Icelandair
Deal found 2/3$555
This Icelandair deal was found by Cheapflights users on 2/4. 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.
Wed 8/127:05 pm
PDX
-
LHR
1 stop32h 50m
Icelandair
Tue 8/259:25 pm
LHR
-
PDX
1 stop28h 30m
Icelandair
Deal found 2/4$596
This KAYAK deal was found by Cheapflights users on 1/31. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/73:30 pm
PDX
-
LHR
1 stop12h 25m
Icelandair
Fri 4/241:05 pm
LHR
-
PDX
1 stop12h 55m
Icelandair
Deal found 1/31$600

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 February 5, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$544
(Gotogate)

One-way from

$285
(Trip.com)

Popular in

June

Cheapest in

October

Average price

$657

Good round-trip deal

$630 or less

Good one-way deal

$370 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 ($24 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
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 February 5, 2026.
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

Mon 3/23

5:40 pm-10:30 am

Nonstop9h 50m

London Heathrow

Tue 3/31

6:30 am-11:45 am

1 stop13h 15m

$617

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 3/4

4:45 pm-10:30 am

Nonstop9h 45m

London Heathrow

Wed 3/11

6:30 am-12:35 pm

1 stop13h 05m

$619

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 3/24

7:25 pm-11:55 am

Nonstop9h 30m

London Heathrow

Tue 3/31

6:30 am-11:45 am

1 stop13h 15m

$621

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 3/4

1:44 pm-3:50 pm

2 stops18h 06m

London Heathrow

Wed 3/11

7:40 am-9:18 pm

2 stops20h 38m

$622

PascoLondon

PSC - LHR

PSCLHR

Pasco Tri Cities

Wed 3/4

12:44 pm-9:40 am

1 stop12h 56m

London Heathrow

Wed 3/11

6:35 am-8:54 pm

2 stops21h 19m

$633

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Thu 3/5

1:37 pm-9:40 am

1 stop12h 03m

London Heathrow

Sat 3/14

6:35 am-9:03 pm

2 stops21h 28m

$633

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 3/4

12:38 pm-12:00 pm

1 stop15h 22m

London Heathrow

Wed 3/11

11:10 am-5:26 pm

2 stops37h 16m

$633

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 3/4

7:00 am-11:15 am

1 stop20h 15m

London Heathrow

Mon 3/9

7:40 am-9:18 pm

2 stops20h 38m

$633

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 4/12

9:45 pm-3:35 pm

Nonstop9h 50m

London Heathrow

Fri 4/24

6:30 am-11:45 am

1 stop13h 15m

$635

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 3/23

7:25 pm-11:55 am

Nonstop9h 30m

London Heathrow

Tue 4/14

6:30 am-11:45 am

1 stop13h 15m

$635

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/3

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, 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 $789). 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 February 5, 2026.

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 February 5, 2026.

The most flights from USWA to LHR are scheduled on a Monday (15 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (11 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 50m. Fly via KLM, Lufthansa, or United Airlines 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?

    $162 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 $225 and $321, 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 American Airlines (78%), Alaska Airlines (78%) or Aer Lingus (78%) 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 $2,250 for a flight from State of Washington to London Heathrow Airport. The cheapest flight overall is $265 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at $515.

  • 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 $789). 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
Croydon
Southend-on-Sea
Harrow
Eastleigh
Gatwick
Dartford
Dover
Winchester
Orpington
Northampton
Watford
Hayes
Borehamwood
Broadway
Aylesbury
Chipping Norton
Horley
Kingston upon Thames

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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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Dulles Intl to Gatwick flights
Newark to Luton flights
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O'Hare Intl to London City flights
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Seattle to Gatwick flights
Raleigh 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 February 5, 2026.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$465Average$718FlexibilityNo cancel feeOn-time77%
IcelandairCheapest$483Average$620FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$500Average$720FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$517Average$861FlexibilityNo cancel feeOn-time71%
Air FranceCheapest$532Average$757FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$534Average$758FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$547Average$845FlexibilityNo cancel feeOn-time69%
FinnairCheapest$556Average$694FlexibilityNo cancel feeOn-time76%
DeltaCheapest$558Average$882FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$565Average$999FlexibilityNo cancel feeOn-time75%

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