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$253+ 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 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
Jul 18 — Jul 251
Sat 7/18
Sat 7/25
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 June 18, 2026.

This Air Canada deal was found by Cheapflights users on 6/17. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/168:00 am
SEA
-
LHR
1 stop17h 35m
Air Canada
Tue 10/65:15 pm
LHR
-
SEA
2 stops33h 17m
Air Canada
Deal found 6/17$861
This Kiwi.com deal was found by Cheapflights users on 6/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/95:40 pm
SEA
-
LGW
1 stop13h 00m
Condor
Fri 8/2110:20 am
LGW
-
SEA
1 stop13h 40m
Condor
Deal found 6/17$862
This oojo deal was found by Cheapflights users on 6/17. 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.
Sun 11/222:35 pm
SEA
-
LHR
1 stop12h 15m
Icelandair
Sat 11/288:35 pm
LHR
-
SEA
1 stop28h 25m
Icelandair
Deal found 6/17$862
This Delta deal was found by Cheapflights users on 6/16. 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.
Tue 9/151:30 pm
SEA
-
LGW
1 stop11h 55m
Delta
Fri 10/1610:25 am
LGW
-
SEA
1 stop15h 22m
Delta
Deal found 6/16$863
This Alaska Airlines deal was found by Cheapflights users on 6/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/159:40 pm
SEA
-
LHR
Nonstop9h 25m
Alaska Airlines
Fri 10/165:00 pm
LHR
-
SEA
Nonstop9h 55m
Alaska Airlines
Deal found 6/16$863
This Mytrip deal was found by Cheapflights users on 6/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/93:40 pm
SEA
-
LGW
3 stops33h 00m
Multiple Airlines
Sun 9/206:20 pm
LGW
-
SEA
3 stops31h 35m
Multiple Airlines
Deal found 6/17$864
This Mytrip deal was found by Cheapflights users on 6/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/43:00 pm
SEA
-
LHR
3 stops22h 40m
Multiple Airlines
Fri 8/216:40 am
LHR
-
SEA
3 stops24h 02m
Multiple Airlines
Deal found 6/17$864
This Mytrip deal was found by Cheapflights users on 6/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2011:25 pm
SEA
-
STN
2 stops17h 05m
Multiple Airlines
Wed 9/27:00 am
STN
-
SEA
2 stops18h 55m
Multiple Airlines
Deal found 6/17$865
This SWISS deal was found by Cheapflights users on 6/16. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/147:00 am
SEA
-
LGW
2 stops17h 25m
SWISS
Wed 10/149:25 am
LGW
-
SEA
2 stops17h 07m
SWISS
Deal found 6/16$865
This Gotogate deal was found by Cheapflights users on 6/17. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/411:25 pm
SEA
-
LHR
1 stop12h 55m
Multiple Airlines
Thu 8/203:15 pm
LHR
-
SEA
1 stop16h 20m
Multiple Airlines
Deal found 6/17$865
This SWISS deal was found by Cheapflights users on 6/16. 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 SWISS is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/147:00 am
SEA
-
LHR
2 stops16h 55m
SWISS
Thu 10/158:45 am
LHR
-
SEA
2 stops17h 47m
SWISS
Deal found 6/16$866
This FlightHub deal was found by Cheapflights users on 6/16. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/209:59 am
SEA
-
LGW
2 stops24h 51m
Multiple Airlines
Tue 10/279:55 am
LGW
-
SEA
1 stop13h 40m
Multiple Airlines
Deal found 6/16$867

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 June 18, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$861
(Icelandair)

One-way from

$253
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$1,166

Good round-trip deal

$995 or less

Good one-way deal

$428 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. 22% potential increase in price ($224 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2026
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 June 18, 2026.
Use the filters below to find and compare flights from Washington to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Sun 9/13

7:00 am-12:35 pm

2 stops21h 35m

London City

Tue 9/22

9:15 am-6:32 pm

2 stops17h 17m

$886

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 9/8

6:05 pm-6:50 pm

1 stop16h 45m

London Gatwick

Thu 9/24

10:20 am-4:00 pm

1 stop13h 40m

$890

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 8/25

6:05 pm-6:50 pm

1 stop16h 45m

London Gatwick

Wed 9/9

10:20 am-3:40 pm

1 stop13h 20m

$890

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 8/23

5:40 pm-6:50 pm

1 stop17h 10m

London Gatwick

Wed 8/26

10:20 am-3:40 pm

1 stop13h 20m

$890

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Thu 8/20

7:00 pm-10:10 pm

2 stops19h 10m

London Luton

Wed 9/2

6:15 am-11:45 am

1 stop13h 30m

$898

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 8/3

9:45 pm-3:35 pm

Nonstop9h 50m

London Heathrow

Wed 8/19

6:30 am-11:37 am

1 stop13h 07m

$900

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 8/10

11:00 pm-9:25 pm

1 stop14h 25m

London Heathrow

Tue 8/25

7:25 am-4:59 pm

1 stop17h 34m

$901

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Wed 9/9

5:40 pm-7:25 pm

2 stops17h 45m

London Luton

Mon 9/14

6:05 am-4:10 pm

2 stops18h 05m

$901

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 8/3

10:52 am-8:30 am

1 stop13h 38m

London Heathrow

Wed 8/19

5:15 pm-6:32 pm

2 stops33h 17m

$908

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 9/13

1:30 pm-9:25 am

1 stop11h 55m

London Gatwick

Sat 9/19

10:25 am-5:43 pm

1 stop15h 18m

$912

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/17

Showing 1-10 of 60 resultsSorted by cheapest first
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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 $320). Flying from State of Washington to London in November is currently the most expensive (average of $2,602). 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 June 18, 2026.

When flying from State of Washington to London, 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

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 June 18, 2026.

The most flights from USWA to LON are scheduled on a Tuesday (23 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (19 on average).

How much does it cost to fly round-trip from State of Washington to London?

How far ahead should I book a flight from State of Washington to London?

The best time to book flights from State of Washington to London is 82 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

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?

    SWISS, Condor, and KLM can get you from State of Washington to London in just under 9h 50m. Your travel time can differ by up to 11h 45m. 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 $161 on Icelandair. Other airlines that offer cheap prices include WestJet from $231 and Aer Lingus from $321 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 Seattle/Tacoma Intl - London Stansted.

  • 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 (89%), Air France (89%) or Delta (89%) 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 $339. On average you can expect to pay $2,439. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for $627.

  • 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 $320). Flying from State of Washington to London in November is currently the most expensive (average of $2,602). 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?

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Browse thousands of different options on Cheapflights for your next trip

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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 June 18, 2026.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest$480Average$720FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$483Average$687FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$515Average$786FlexibilityNo cancel feeOn-time71%
Air FranceCheapest$517Average$756FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$521Average$744FlexibilityNo cancel feeOn-time70%
DeltaCheapest$544Average$870FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$547Average$882FlexibilityNo cancel feeOn-time69%
FinnairCheapest$556Average$694FlexibilityNo cancel feeOn-time76%
Virgin AtlanticCheapest$565Average$938FlexibilityNo cancel feeOn-time72%
Alaska AirlinesCheapest$608Average$1,090FlexibilityNo cancel feeOn-time75%

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