HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
London

$268+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
May 25 — Jun 11
Mon 5/25
Mon 6/1
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Washington to London with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 April 25, 2026.

This Mytrip deal was found by Cheapflights users on 4/20. 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 6/47:00 pm
SEA
-
STN
2 stops19h 55m
Multiple Airlines
Thu 6/117:00 am
STN
-
SEA
2 stops18h 55m
Multiple Airlines
Deal found 4/20$681
This Mytrip deal was found by Cheapflights users on 4/20. 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.
Mon 5/47:00 pm
SEA
-
LGW
3 stops29h 40m
Multiple Airlines
Mon 5/116:05 pm
LGW
-
SEA
2 stops34h 35m
Multiple Airlines
Deal found 4/20$685
This Mytrip deal was found by Cheapflights users on 4/20. 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.
Mon 5/43:40 pm
SEA
-
LGW
2 stops20h 30m
Multiple Airlines
Tue 5/199:40 am
LGW
-
SEA
2 stops17h 05m
Multiple Airlines
Deal found 4/20$693
This Mytrip deal was found by Cheapflights users on 4/20. 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.
Mon 5/43:40 pm
SEA
-
LTN
3 stops25h 30m
Multiple Airlines
Tue 5/199:40 am
LTN
-
SEA
2 stops17h 05m
Multiple Airlines
Deal found 4/20$696
This Mytrip deal was found by Cheapflights users on 4/21. 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 5/53:40 pm
SEA
-
LGW
2 stops17h 45m
Multiple Airlines
Tue 5/199:40 am
LGW
-
SEA
2 stops17h 05m
Multiple Airlines
Deal found 4/21$700
This Mytrip deal was found by Cheapflights users on 4/21. 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.
Sat 5/23:40 pm
SEA
-
STN
2 stops24h 25m
Multiple Airlines
Tue 5/126:30 am
STN
-
SEA
3 stops35h 10m
Multiple Airlines
Deal found 4/21$702
This Scandinavian Airlines deal was found by Cheapflights users on 4/20. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/263:55 pm
SEA
-
LHR
1 stop33h 25m
Scandinavian Airlines
Tue 9/296:40 am
LHR
-
SEA
2 stops15h 05m
Scandinavian Airlines
Deal found 4/20$703
This Mytrip deal was found by Cheapflights users on 4/20. 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.
Mon 4/273:40 pm
SEA
-
STN
2 stops19h 10m
Multiple Airlines
Fri 5/16:20 am
STN
-
SEA
2 stops19h 35m
Multiple Airlines
Deal found 4/20$704
This Mytrip deal was found by Cheapflights users on 4/20. 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.
Mon 4/273:40 pm
SEA
-
LGW
2 stops16h 40m
Multiple Airlines
Mon 5/46:05 pm
LGW
-
SEA
2 stops34h 35m
Multiple Airlines
Deal found 4/20$704
This Mytrip deal was found by Cheapflights users on 4/21. 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 5/53:40 pm
SEA
-
LTN
3 stops24h 05m
Multiple Airlines
Tue 5/199:40 am
LTN
-
SEA
2 stops17h 05m
Multiple Airlines
Deal found 4/21$706
This Cheapflightsfares deal was found by Cheapflights users on 4/21. 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 4/225:40 pm
SEA
-
LGW
1 stop17h 05m
Condor
Wed 5/610:20 am
LGW
-
SEA
1 stop13h 20m
Condor
Deal found 4/21$707
This Mytrip deal was found by Cheapflights users on 4/20. 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.
Sun 4/263:40 pm
SEA
-
LGW
2 stops20h 20m
Multiple Airlines
Thu 4/307:25 am
LGW
-
SEA
2 stops21h 15m
Multiple Airlines
Deal found 4/20$708

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 April 25, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$681
(Mytrip)

One-way from

$268
(Kiwi.com)

Popular in

June

Cheapest in

January

Average price

$710

Good round-trip deal

$972 or less

Good one-way deal

$516 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. 18% potential increase in price ($172 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 April 25, 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 - LTN

SEALTN

Seattle/Tacoma Intl

Thu 5/7

6:05 pm-12:50 am

2 stops22h 45m

London Luton

Sun 5/10

6:15 pm-4:10 pm

2 stops29h 55m

$860

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 9/21

7:00 am-9:35 am

2 stops18h 35m

London Heathrow

Mon 9/28

7:50 pm-4:33 pm

3 stops28h 43m

$869

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sat 8/22

11:25 pm-2:40 pm

1 stop31h 15m

London Gatwick

Mon 8/31

3:40 pm-8:40 pm

1 stop13h 00m

$875

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 9/9

9:40 am-12:10 pm

1 stop18h 30m

London Heathrow

Wed 9/23

6:30 am-11:10 am

1 stop12h 40m

$879

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Tue 5/5

6:05 pm-10:25 pm

2 stops20h 20m

London Luton

Mon 5/11

6:05 am-4:10 pm

2 stops18h 05m

$888

PortlandLondon

PDX - LHR

PDXLHR

Portland

Fri 9/18

1:38 pm-6:30 pm

3 stops20h 52m

London Heathrow

Mon 9/28

7:50 pm-4:33 pm

3 stops28h 43m

$893

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 8/31

1:25 pm-1:05 pm

1 stop15h 40m

London Heathrow

Wed 9/9

7:15 pm-11:10 am

1 stop23h 55m

$928

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 9/13

3:50 pm-3:35 pm

1 stop15h 45m

London Heathrow

Sun 9/20

6:30 am-11:10 am

1 stop12h 40m

$929

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Tue 8/18

1:50 pm-9:30 am

1 stop11h 40m

London City

Wed 9/30

9:20 am-4:35 pm

1 stop15h 15m

$932

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 9/6

1:25 pm-1:45 pm

2 stops16h 20m

London Heathrow

Sat 9/26

6:30 am-11:10 am

1 stop12h 40m

$934

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/24

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

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

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 64 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.

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 December is currently the most expensive (average of $1,659). 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 April 25, 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 April 25, 2026.

The most flights from USWA to LON are scheduled on a Tuesday (22 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (21 on average).

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

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?

    Scandinavian Airlines, Icelandair, and Delta can get you from State of Washington to London in just under 18h 30m. Your travel time can differ by up to 12h 45m. Airlines will cover a distance of 4896 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 $162 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 (95%), Delta (94%) or Virgin Atlantic (94%) 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 $340. On average you can expect to pay $2,452. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for $690.

  • 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 December is currently the most expensive (average of $1,659). 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
Ilford
Hounslow
Winchester
Croydon
Gatwick
Southend-on-Sea
Harrow
Eastleigh
Dartford
Dover
Orpington
Watford
Borehamwood
Chipping Norton
Hayes
Kingston upon Thames
Eastbourne
Slough
Sutton
Stansted

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 April 25, 2026.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest$481Average$628FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$483Average$654FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$515Average$790FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$526Average$720FlexibilityNo cancel feeOn-time70%
IberiaCheapest$527Average$756FlexibilityNo cancel feeOn-time77%
Scandinavian AirlinesCheapest$532Average$900FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$532Average$775FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$547Average$839FlexibilityNo cancel feeOn-time69%
DeltaCheapest$551Average$852FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$556Average$694FlexibilityNo cancel feeOn-time76%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.