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Cheap flights from Washington to London from £187

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 25/7. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
8 Jul — 15 Jul1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Washington to London

Enter your travel dates to find the best prices.

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 8 June 2026.

Mon 29/615:40
SEA
-
LGW
2 stops19h 10m
Multiple Airlines
Tue 7/719:45
LGW
-
SEA
2 stops32h 55m
Multiple Airlines
Deal found 3/6£669
Tue 1/919:20
SEA
-
LHR
2 stops27h 10m
Lufthansa
Mon 21/920:25
LHR
-
SEA
2 stops23h 30m
Lufthansa
Deal found 3/6£669
Tue 18/815:55
SEA
-
LHR
1 stop17h 45m
Scandinavian Airlines
Wed 30/919:30
LHR
-
SEA
2 stops35h 20m
Scandinavian Airlines
Deal found 3/6£671
Wed 28/1008:25
SEA
-
LCY
2 stops16h 45m
Virgin Atlantic
Wed 11/1107:45
LCY
-
SEA
2 stops19h 14m
Virgin Atlantic
Deal found 3/6£672
Mon 31/808:10
SEA
-
LHR
2 stops24h 55m
Multiple Airlines
Sat 19/913:45
LHR
-
SEA
1 stop17h 12m
Multiple Airlines
Deal found 3/6£672
Sun 28/619:00
SEA
-
LGW
1 stop32h 45m
Icelandair
Wed 15/715:40
LGW
-
SEA
1 stop13h 00m
Icelandair
Deal found 3/6£673
Wed 17/623:25
SEA
-
LGW
1 stop31h 15m
Icelandair
Sun 21/615:40
LGW
-
SEA
1 stop34h 15m
Icelandair
Deal found 3/6£675
Fri 21/815:40
SEA
-
STN
2 stops15h 45m
Multiple Airlines
Wed 26/807:00
STN
-
SEA
2 stops18h 55m
Multiple Airlines
Deal found 3/6£675
Thu 16/719:00
SEA
-
LGW
1 stop11h 40m
Multiple Airlines
Tue 28/708:50
LGW
-
SEA
2 stops32h 50m
Multiple Airlines
Deal found 4/6£675
Sun 16/818:20
SEA
-
LHR
Nonstop9h 50m
Delta
Tue 22/908:40
LHR
-
SEA
1 stop15h 55m
Delta
Deal found 4/6£675
Thu 3/920:10
SEA
-
LHR
Nonstop9h 50m
Delta
Thu 24/911:45
LHR
-
SEA
1 stop12h 50m
Delta
Deal found 3/6£676
Tue 28/710:45
SEA
-
LCY
2 stops22h 40m
SWISS
Tue 18/809:15
LCY
-
SEA
2 stops17h 17m
SWISS
Deal found 3/6£677

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 8 June 2026.

Round-trip from

£669

One-way from

£187

Popular in

June

Cheapest in

January

Average price

£852

Good round-trip deal

£736 or less

Good one-way deal

£466 or less
29/6-7/7
  • 29/6-7/7
  • 4 total stops
  • 52h 05m total
  • Washington to London
Search Deals
25/7
  • 25/7
  • 2 total stops
  • 40h 40m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 20% potential increase in price (£116 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£19 potential savings vs. average return 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

 
Customise 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 858,174 searches. Data last updated 8 June 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 return flight

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Tue 15/9

18:50-22:40

2 stops19h 50m

London Luton

Fri 18/9

06:20-18:45

2 stops20h 25m

£684

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Thu 17/9

07:00-08:25

2 stops17h 25m

London Gatwick

Thu 1/10

09:25-18:32

2 stops17h 07m

£687

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Tue 15/9

07:00-08:25

2 stops17h 25m

London Gatwick

Fri 18/9

09:25-22:45

2 stops21h 20m

£693

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Fri 7/8

15:55-18:30

2 stops18h 35m

London Heathrow

Mon 17/8

19:50-13:45

2 stops25h 55m

£698

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Wed 30/9

13:19-17:25

2 stops20h 06m

London City

Wed 14/10

09:15-18:32

2 stops17h 17m

£702

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sun 8/11

09:40-10:30

1 stop16h 50m

London Heathrow

Sat 14/11

08:40-21:53

2 stops21h 13m

£702

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 11/10

10:05-18:50

2 stops24h 45m

London Gatwick

Sat 17/10

10:20-16:00

1 stop13h 40m

£705

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Mon 31/8

19:00-22:05

2 stops19h 05m

London Luton

Sat 19/9

05:40-09:52

3 stops36h 12m

£705

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Thu 17/9

17:45-18:30

1 stop16h 45m

London City

Thu 1/10

09:20-22:02

2 stops20h 42m

£705

PortlandLondon

PDX - LHR

PDXLHR

Portland

Sat 12/9

22:05-20:10

1 stop14h 05m

London Heathrow

Sun 20/9

06:15-16:05

2 stops17h 50m

£708

Flights are sorted by cheapest return flights first.

Deals found on 5/6

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 return 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 £240). Flying from State of Washington to London in November is currently the most expensive (average of £1,601). 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 8 June 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 8 June 2026.

The most flights from USWA to LON are scheduled on a Wednesday (23 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (21 on average).

How much does it cost for a return flight 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, Scandinavian Airlines, and Delta can get you from State of Washington to London in just under 16h 50m. Your travel time can differ by up to 1h 45m. The distance from State of Washington to London is about 4896 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    To fly one-way, consider booking your trip with Icelandair, which is currently one of the cheapest options available, starting at £162. Virgin Atlantic flights start at £294 while deals on British Airways start at £308 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?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from State of Washington to London on time: KLM (93%), Air France (93%), Delta (93%).

  • What are the cheapest flights from State of Washington to London?

    On average you can expect to pay £667 for a flight from State of Washington to London. The cheapest flight overall is £267 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at £445.

  • 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 holiday 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 £240). Flying from State of Washington to London in November is currently the most expensive (average of £1,601). 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

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Alternative routes for Washington to London

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Top 2 airlines flying from Washington to London

Discover the top 2 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 858,174 searches. Data last updated 8 June 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£355Average£522FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£369Average£587FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Washington to London?

When you search for this flight from Washington to London, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Washington to London?

Millions of users choose and trust Cheapflights to book the best flight deals from Washington to London for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Washington to London with no change fees?

Yes! Cheapflights helps users easily find flights from Washington to London with no change fees.

Can Cheapflights notify me if prices for flights from Washington to London become cheaper?

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to London from Washington today and book when prices fit your budget.

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