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$251+ Cheap flights from Washington to London (LON)

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 2/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
1 adult, Economy
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Cheap flight deals from Washington to London

Cheapest flights from Washington to London
Explore the most affordable flight options available from Washington to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 15, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 12/14. 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.
Wed 12/319:50 amPDX - LHR
1 stop18h 00mLufthansa
Fri 1/236:35 amLHR - PDX
2 stops19h 55mLufthansa
Deal found 12/14$668
This Cheapflightsfares deal was found by Cheapflights users on 12/14. 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.
Wed 12/319:50 amPDX - LHR
1 stop18h 00mLufthansa
Wed 1/216:35 amLHR - PDX
2 stops19h 35mLufthansa
Deal found 12/14$677
This CrystalTravel deal was found by Cheapflights users on 12/14. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/242:35 pmSEA - LHR
1 stop12h 15mIcelandair
Sat 1/1712:15 pmLHR - SEA
1 stop12h 45mIcelandair
Deal found 12/14$677
This Cheapflightsfares deal was found by Cheapflights users on 12/14. 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.
Wed 12/319:50 amPDX - LHR
2 stops16h 20mLufthansa
Wed 1/289:30 amLHR - PDX
2 stops21h 14mLufthansa
Deal found 12/14$687
This CrystalTravel deal was found by Cheapflights users on 12/14. 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 CrystalTravel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/317:10 amPDX - LHR
1 stop14h 45mBrussels Airlines
Wed 1/2810:25 amLHR - PDX
1 stop16h 31mBrussels Airlines
Deal found 12/14$703
This Cheapflightsfares deal was found by Cheapflights users on 12/14. 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.
Wed 12/313:40 pmSEA - LHR
1 stop12h 10mLufthansa
Mon 1/126:30 pmLHR - SEA
2 stops31h 44mLufthansa
Deal found 12/14$706
This Gotogate deal was found by Cheapflights users on 12/14. 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 12/292:35 pmSEA - LHR
1 stop20h 55mIcelandair
Sun 1/188:35 pmLHR - SEA
1 stop28h 25mIcelandair
Deal found 12/14$710
This KLM deal was found by Cheapflights users on 12/14. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/311:45 pmPDX - LHR
1 stop12h 15mKLM
Wed 1/216:30 amLHR - PDX
1 stop12h 55mKLM
Deal found 12/14$711
This Cheapflightsfares deal was found by Cheapflights users on 12/14. 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.
Wed 12/3111:53 amPDX - LHR
1 stop15h 47mBritish Airways
Fri 1/231:45 pmLHR - PDX
Nonstop10h 10mBritish Airways
Deal found 12/14$722
This Cheapflightsfares deal was found by Cheapflights users on 12/15. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/3012:54 pmPDX - LHR
1 stop12h 46mLufthansa
Sun 2/811:10 amLHR - PDX
2 stops21h 29mLufthansa
Deal found 12/15$727
This Gotogate deal was found by Cheapflights users on 12/14. 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 12/298:00 pmSEA - LHR
1 stop31h 50mMultiple Airlines
Sun 1/187:40 amLHR - SEA
2 stops19h 36mMultiple Airlines
Deal found 12/14$733
This United Airlines deal was found by Cheapflights users on 12/13. 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.
Tue 12/305:54 pmSEA - LHR
1 stop29h 31mUnited Airlines
Wed 1/72:30 pmLHR - SEA
1 stop26h 45mUnited Airlines
Deal found 12/13$747

Find flight deals from Washington to London

Keep the following information in mind while searching for Washington to London flight deals. Data was last updated December 15, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$578
(KAYAK)

One-way from

$251
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$986

Good round-trip deal

$643 or less

Good one-way deal

$379 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 (LON)
Search Deals
One-way flight from Washington to London (LON)
Search Deals
Highest demand for flights based on searches. 15% potential increase in price ($139 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 (LON).
Search Deals
Price to beat on a one-way flight from Washington to London (LON).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington to London 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 15, 2025.
Use the filters below to find and compare flights from Washington to London that are best for you.

Fly from

Washington

Fly to

London

Route

Depart

Return

Price

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Sun 2/1

3:10 pm-8:05 pm

3 stops20h 55m

London Stansted

Sat 2/7

9:10 pm-1:20 pm

2 stops24h 10m

$588

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Fri 1/23

3:10 pm-8:35 pm

3 stops21h 25m

London Stansted

Sat 1/31

9:00 pm-1:20 pm

2 stops24h 20m

$589

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Sat 1/10

2:35 pm-4:05 pm

2 stops17h 30m

London Luton

Sat 1/17

6:00 am-5:00 pm

2 stops19h 00m

$590

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Sun 1/11

3:10 pm-12:50 am

2 stops25h 40m

London Stansted

Sun 1/18

6:15 am-10:06 pm

3 stops23h 51m

$595

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 3/4

7:00 am-12:00 pm

1 stop21h 00m

London Heathrow

Mon 3/9

7:40 am-9:18 pm

2 stops20h 38m

$597

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Wed 3/4

1:44 pm-5:05 pm

2 stops19h 21m

London Heathrow

Wed 3/11

6:35 am-9:03 pm

2 stops21h 28m

$605

SpokaneLondon

GEG - LHR

GEGLHR

Spokane

Tue 2/24

12:38 pm-12:00 pm

1 stop15h 22m

London Heathrow

Tue 3/10

9:30 am-9:18 pm

2 stops18h 48m

$607

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 2/16

4:55 pm-10:30 am

Nonstop9h 35m

London Heathrow

Sun 2/22

8:40 am-11:40 am

1 stop35h 00m

$614

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 2/18

4:55 pm-10:30 am

Nonstop9h 35m

London Heathrow

Sun 2/22

8:40 am-11:40 am

1 stop35h 00m

$614

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Sun 1/18

4:45 pm-10:30 am

Nonstop9h 45m

London Heathrow

Sat 1/31

6:30 am-11:50 am

1 stop13h 20m

$615

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Showing 1-10 of 60 results
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Best time to book a flight from Washington to London

Have a flexible travel schedule? Discover the best time to fly to London 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

What is the cheapest month to book a flight from State of Washington to London?

Currently, January is the cheapest month in which you can book a flight from State of Washington to London (average of $491). Flying from State of Washington to London 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 LON?

Find hourly flight availability from Washington to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 15, 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 23% on flights from State of Washington to London by exploring options for tickets in the evening.

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

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

Travelers seeking maximum savings on their State of Washington to London flight should consider departing on Monday afternoons when fares are most often at their lowest. Saturday 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

Explore weekly flight availability from Washington to London. 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 15, 2025.

The most flights from USWA to LON are scheduled on a Saturday (16 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (12 on average).

Related info for your journey

Find useful and relevant information for your journey from Washington to London. 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?

    Lufthansa, Delta, and KLM can get you from State of Washington to London in just under 9h 35m. Your travel time can differ by up to 11h 25m. Airlines will cover a distance of 4783 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

    One-way options have recently been found by users for as low as $166 on Icelandair. Other airlines that offer cheap prices include WestJet from $222 and Aer Lingus from $362 one-way.

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

    The most popular route from State of Washington to London is Seattle/Tacoma Intl - London Heathrow. You may also consider Seattle/Tacoma Intl - London Gatwick or Portland - London Heathrow.

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

    No one likes to see their flight delayed. When booking a flight from State of Washington to London consider choosing KLM (87%), Delta (85%) or Virgin Atlantic (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?

    The cheapest flight price from State of Washington to London is $333. On average you can expect to pay $2,221. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for $496.

  • Can I find deals for flights from Washington to London that include hotel bookings?

    Yes. In addition to deals on Washington to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to London.

  • Can I find deals for business class flights from Washington to London?

    Yes. Cheapflights offers flight deals from Washington to London 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?

    Currently, January is the cheapest month in which you can book a flight from State of Washington to London (average of $491). Flying from State of Washington to London 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?

Book flights to London if you plan to visit one of these locations
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Harrow
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Watford
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Alternative routes for Washington to London

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Top 10 airlines flying from Washington to London

Discover the top 10 airlines that operate flights from Washington to London. 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 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Scandinavian AirlinesCheapest$465Average$859FlexibilityNo cancel feeOn-time77%
IcelandairCheapest$481Average$657FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$500Average$700FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$517Average$920FlexibilityNo cancel feeOn-time71%
Air FranceCheapest$532Average$762FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$543Average$782FlexibilityNo cancel feeOn-time70%
United AirlinesCheapest$547Average$892FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$553Average$989FlexibilityNo cancel feeOn-time75%
FinnairCheapest$556Average$694FlexibilityNo cancel feeOn-time76%
DeltaCheapest$562Average$858FlexibilityNo cancel feeOn-timeN/A

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