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$282+ 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 5/19. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LHR
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
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 April 17, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$613
(oojo)

One-way from

$284
(oojo)

Popular in

June

Cheapest in

October

Average price

$684

Good round-trip deal

$722 or less

Good one-way deal

$489 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. 18% potential increase in price ($180 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 17, 2025.

This oojo deal was found by Cheapflights users on 4/16. 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 10/13:45 pmSEA - LHR
1 stop12h 10mIcelandair
Sat 10/111:05 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 4/16$533
This Iberia deal was found by Cheapflights users on 4/15. 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.
Mon 4/2811:20 amSEA - LHR
1 stop15h 10mIberia
Tue 5/139:25 amLHR - SEA
Nonstop9h 45mIberia
Deal found 4/15$595
This Finnair deal was found by Cheapflights users on 4/15. 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 Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/281:30 pmSEA - LHR
Nonstop9h 20mFinnair
Tue 5/139:25 amLHR - SEA
Nonstop9h 45mFinnair
Deal found 4/15$612
This Air Canada deal was found by Cheapflights users on 4/16. 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.
Sun 5/47:20 amSEA - LHR
2 stops18h 15mAir Canada
Wed 5/218:40 amLHR - SEA
2 stops18h 57mAir Canada
Deal found 4/16$613
This Delta deal was found by Cheapflights users on 4/16. 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.
Wed 4/238:20 pmSEA - LHR
Nonstop9h 55mDelta
Wed 5/79:00 amLHR - SEA
1 stop16h 25mDelta
Deal found 4/16$616
This Air Canada deal was found by Cheapflights users on 4/16. 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.
Sun 9/286:15 amPDX - LHR
2 stops19h 45mMultiple Airlines
Tue 10/78:30 amLHR - PDX
2 stops18h 16mMultiple Airlines
Deal found 4/16$618
This oojo deal was found by Cheapflights users on 4/17. 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.
Thu 10/23:20 pmPDX - LHR
1 stop21h 00mIcelandair
Tue 10/141:05 pmLHR - PDX
1 stop12h 50mIcelandair
Deal found 4/17$619
This Delta deal was found by Cheapflights users on 4/16. 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.
Wed 4/303:10 pmPDX - LHR
1 stop15h 05mDelta
Wed 5/76:30 amLHR - PDX
1 stop12h 50mDelta
Deal found 4/16$622
This Air Canada deal was found by Cheapflights users on 4/16. 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.
Wed 5/73:25 pmPDX - LHR
1 stop13h 55mAir Canada
Wed 5/142:05 pmLHR - PDX
2 stops27h 25mAir Canada
Deal found 4/16$624
This Air Canada deal was found by Cheapflights users on 4/16. 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 9/87:20 amSEA - LHR
1 stop18h 40mMultiple Airlines
Tue 9/168:45 amLHR - SEA
2 stops17h 51mMultiple Airlines
Deal found 4/16$627
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/301:57 pmPDX - LHR
1 stop14h 48mAmerican Airlines
Wed 5/73:40 pmLHR - PDX
Nonstop9h 55mAmerican Airlines
Deal found 4/16$628
This Expedia deal was found by Cheapflights users on 4/17. 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.
Sun 8/34:00 pmSEA - LHR
1 stop33h 20mScandinavian Airlines
Sun 8/177:30 pmLHR - SEA
1 stop26h 20mScandinavian Airlines
Deal found 4/17$636

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 April 17, 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

Wed 10/1

3:45 pm-11:55 am

1 stop12h 10m

London Heathrow

Sat 10/11

1:05 pm-5:50 pm

1 stop12h 45m

$533

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 4/28

11:20 am-10:30 am

1 stop15h 10m

London Heathrow

Tue 5/13

9:25 am-11:10 am

Nonstop9h 45m

$595

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 4/28

1:30 pm-6:50 am

Nonstop9h 20m

London Heathrow

Tue 5/13

9:25 am-11:10 am

Nonstop9h 45m

$612

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 5/4

7:20 am-9:35 am

2 stops18h 15m

London Heathrow

Wed 5/21

8:40 am-7:37 pm

2 stops18h 57m

$613

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 5/13

8:20 pm-2:15 pm

Nonstop9h 55m

London Heathrow

Wed 5/21

11:30 am-5:25 pm

1 stop13h 55m

$616

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 9/28

6:15 am-10:00 am

2 stops19h 45m

London Heathrow

Tue 10/7

8:30 am-6:46 pm

2 stops18h 16m

$618

PortlandLondon

PDX - LHR

PDXLHR

Portland

Thu 10/2

3:20 pm-8:20 pm

1 stop21h 00m

London Heathrow

Tue 10/14

1:05 pm-5:55 pm

1 stop12h 50m

$619

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 4/30

3:10 pm-2:15 pm

1 stop15h 05m

London Heathrow

Wed 5/7

6:30 am-11:20 am

1 stop12h 50m

$622

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 5/7

3:25 pm-1:20 pm

1 stop13h 55m

London Heathrow

Wed 5/14

2:05 pm-9:30 am

2 stops27h 25m

$624

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 9/8

7:20 am-10:00 am

1 stop18h 40m

London Heathrow

Tue 9/16

8:45 am-6:36 pm

2 stops17h 51m

$627

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

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 $661). Flying from State of Washington to London Heathrow Airport in June is currently the most expensive (average of $1,110). 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 April 17, 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 April 17, 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).

Rainfall in Heathrow by month

Plan your trip to Heathrow by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in London Heathrow Airport ranges from 1.6 - 2.8 inches per month. January is typically the wettest month, when rainfall can reach 2.8 in. July is typically the driest time to visit London Heathrow Airport when rainfall is around 1.6 in.

Temperature in Heathrow by month

Plan your trip to Heathrow by taking into account the average temperature totals by month.

If weather is an important factor for your trip to London Heathrow Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 62.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 39.2 F).

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 April 17, 2025.
Read through reviews of airlines operating flights from Washington to London, such as Delta, Alaska Airlines and KLM. In addition to providing an overall rating, users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,917 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Delta
8.0
Very good
7,917 reviews
Delta
8.0
Very good
7,917 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Alaska Airlines
8.0
Very good
9,882 reviews
Delta
8.0
Very good
7,917 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
KLM
7.8
Good
1,329 reviews
Delta
8.0
Very good
7,917 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Finnair
7.6
Good
1,269 reviews
Delta
8.0
Very good
7,917 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.
Air France
7.5
Good
1,435 reviews
Delta
8.0
Very good
7,917 reviews

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Overall

8.0

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

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?

    $284 is the cheapest one-way deal found within the past few days, from Icelandair. You may also be able to find cheap deals on Scandinavian Airlines and British Airways, with prices starting from $392 and $415, 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 (90%), KLM (85%) or Aeromexico (85%) 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 $2,432 for a flight from State of Washington to London Heathrow Airport. The cheapest flight overall is $411 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at $508.

  • 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 $1,110). 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 Washington?

Book flights to Washington if you plan to visit one of these locations
Hayes
Hounslow
Thornton Heath
Luton
Horley
Wembley
Canterbury
Harrow
Dover
Stratford-upon-Avon
Gatwick
Orpington
Watford
Northampton
Croydon
Borehamwood
Folkestone
Ilford
Broadway
Aylesbury

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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 April 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest$378Average$799FlexibilityNo cancel feeOn-time76%
IcelandairCheapest$504Average$677FlexibilityNo cancel feeOn-time76%
United AirlinesCheapest$550Average$882FlexibilityNo cancel feeOn-time69%
IberiaCheapest$581Average$734FlexibilityNo cancel feeOn-time77%
Aer LingusCheapest$583Average$816FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$597Average$762FlexibilityNo cancel feeOn-time76%
KLMCheapest$598Average$822FlexibilityNo cancel feeOn-time75%
DeltaCheapest$614Average$884FlexibilityNo cancel feeOn-timeN/A
Air FranceCheapest$615Average$909FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$621Average$875FlexibilityNo cancel feeOn-time70%

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