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$280+ 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 10/5. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
May 29 — Jun 51
Fri 5/29
Fri 6/5
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 April 29, 2026.

This CrystalTravel deal was found by Cheapflights users on 4/26. 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.
Sat 9/53:55 pm
SEA
-
LHR
1 stop17h 45m
Scandinavian Airlines
Tue 9/86:40 am
LHR
-
SEA
1 stop15h 05m
Scandinavian Airlines
Deal found 4/26$747
This CrystalTravel deal was found by Cheapflights users on 4/25. 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.
Sun 8/163:55 pm
SEA
-
LHR
1 stop18h 35m
Scandinavian Airlines
Sat 9/266:40 am
LHR
-
SEA
1 stop15h 05m
Scandinavian Airlines
Deal found 4/25$748
This Cheapflightsfares deal was found by Cheapflights users on 4/27. 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.
Mon 4/276:10 pm
SEA
-
LGW
1 stop16h 40m
Condor
Tue 5/1210:20 am
LGW
-
SEA
1 stop13h 20m
Condor
Deal found 4/27$752
This Kiwi.com deal was found by Cheapflights users on 4/27. 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 9/183:55 pm
SEA
-
LHR
1 stop13h 40m
Scandinavian Airlines
Tue 9/296:40 am
LHR
-
SEA
1 stop15h 05m
Scandinavian Airlines
Deal found 4/27$752
This Mytrip deal was found by Cheapflights users on 4/25. 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 8/123:40 pm
SEA
-
STN
2 stops16h 50m
Multiple Airlines
Wed 8/2611:15 am
STN
-
SEA
2 stops17h 25m
Multiple Airlines
Deal found 4/25$753
This eDestinos deal was found by Cheapflights users on 4/25. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/87:00 pm
SEA
-
LGW
1 stop11h 40m
Icelandair
Sat 9/193:40 pm
LGW
-
SEA
1 stop13h 00m
Icelandair
Deal found 4/25$753
This Kiwi.com deal was found by Cheapflights users on 4/25. 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 10/23:55 pm
SEA
-
LHR
1 stop13h 40m
Scandinavian Airlines
Sat 10/106:40 am
LHR
-
SEA
1 stop15h 05m
Scandinavian Airlines
Deal found 4/25$755
This Cheapflightsfares deal was found by Cheapflights users on 4/24. 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 10/136:05 pm
SEA
-
LGW
1 stop16h 45m
Condor
Tue 10/2010:20 am
LGW
-
SEA
1 stop13h 20m
Condor
Deal found 4/24$756
This Mytrip deal was found by Cheapflights users on 4/26. 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 8/173:40 pm
SEA
-
STN
2 stops19h 10m
Multiple Airlines
Tue 8/257:10 am
STN
-
SEA
2 stops21h 30m
Multiple Airlines
Deal found 4/26$757
This Expedia deal was found by Cheapflights users on 4/26. 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.
Wed 9/305:40 pm
SEA
-
LGW
1 stop17h 05m
Condor
Mon 10/510:20 am
LGW
-
SEA
1 stop13h 50m
Condor
Deal found 4/26$757
This Cheapflightsfares deal was found by Cheapflights users on 4/24. 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.
Sun 5/35:40 pm
SEA
-
LGW
1 stop17h 10m
Condor
Fri 5/810:20 am
LGW
-
SEA
1 stop13h 40m
Condor
Deal found 4/24$763
This Booking.com deal was found by Cheapflights users on 4/26. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/213:55 pm
SEA
-
LHR
2 stops33h 00m
Scandinavian Airlines
Mon 8/247:05 am
LHR
-
SEA
2 stops38h 40m
Scandinavian Airlines
Deal found 4/26$763

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 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$747
(CrystalTravel)

One-way from

$280
(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 29, 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

PortlandLondon

PDX - STN

PDXSTN

Portland

Thu 5/28

3:30 pm-12:30 am

2 stops25h 00m

London Stansted

Thu 6/4

6:05 am-1:50 pm

3 stops39h 45m

$857

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 5/3

8:31 am-6:50 pm

2 stops26h 19m

London Gatwick

Fri 5/8

10:20 am-4:00 pm

1 stop13h 40m

$860

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Thu 5/7

6:05 pm-12:50 am

2 stops22h 45m

London Luton

Thu 5/14

5:40 am-4:00 pm

2 stops18h 20m

$871

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Sun 5/31

5:40 pm-7:55 pm

2 stops18h 15m

London Luton

Thu 6/4

8:35 pm-4:00 pm

2 stops27h 25m

$873

PortlandLondon

PDX - LHR

PDXLHR

Portland

Wed 9/16

2:30 pm-1:15 pm

1 stop14h 45m

London Heathrow

Tue 9/22

6:30 am-4:33 pm

2 stops18h 03m

$888

PortlandLondon

PDX - LGW

PDXLGW

Portland

Thu 9/3

3:35 pm-6:50 pm

1 stop19h 15m

London Gatwick

Fri 9/11

7:45 pm-1:05 pm

1 stop25h 20m

$888

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 8/17

7:00 am-6:20 am

1 stop15h 20m

London Heathrow

Tue 8/25

6:30 am-3:58 pm

2 stops17h 28m

$888

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 10/26

9:40 am-7:35 am

1 stop14h 55m

London Heathrow

Thu 11/5

6:30 am-6:43 pm

2 stops20h 13m

$888

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Tue 5/5

7:10 pm-4:40 pm

1 stop37h 30m

London Stansted

Tue 5/12

6:55 am-5:15 pm

1 stop18h 20m

$893

PortlandLondon

PDX - LCY

PDXLCY

Portland

Mon 10/12

1:05 pm-7:45 pm

1 stop22h 40m

London City

Mon 10/19

5:10 pm-11:10 am

1 stop26h 00m

$903

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/26

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

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 29, 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 29, 2026.

The most flights from USWA to LON are scheduled on a Tuesday (22 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (18 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?

    Condor, Virgin Atlantic, and KLM can get you from State of Washington to London in just under 12h 15m. Your travel time can differ by up to 4h 30m. 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 $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 (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 $344. On average you can expect to pay $2,521. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for $674.

  • 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
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Hayes
Kingston upon Thames
Eastbourne
Slough
Sutton
Stansted

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 April 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest$481Average$628FlexibilityNo cancel feeOn-timeN/A
IcelandairCheapest$483Average$651FlexibilityNo cancel feeOn-time76%
American AirlinesCheapest$515Average$792FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$526Average$721FlexibilityNo cancel feeOn-time70%
Scandinavian AirlinesCheapest$532Average$891FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$532Average$781FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$547Average$839FlexibilityNo cancel feeOn-time69%
DeltaCheapest$552Average$855FlexibilityNo cancel feeOn-timeN/A
FinnairCheapest$556Average$694FlexibilityNo cancel feeOn-time76%
IberiaCheapest$567Average$830FlexibilityNo cancel feeOn-time77%

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