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Cheap flights from Washington to London from £173

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 14/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
14 Aug — 21 Aug1
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 15 July 2026.

Tue 6/1019:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Wed 21/1013:05
LHR
-
SEA
1 stop12h 50m
Icelandair
Deal found 15/7£486
Wed 9/1214:35
SEA
-
LHR
1 stop20h 55m
Icelandair
Tue 22/1220:35
LHR
-
SEA
1 stop28h 25m
Icelandair
Deal found 15/7£488
Wed 23/915:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Sun 4/1013:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Deal found 15/7£491
Tue 20/1008:00
SEA
-
LHR
2 stops16h 05m
Multiple Airlines
Mon 2/1106:30
LHR
-
SEA
1 stop13h 30m
Multiple Airlines
Deal found 14/7£492
Fri 4/923:25
SEA
-
LGW
1 stop31h 10m
Icelandair
Thu 17/915:40
LGW
-
SEA
1 stop13h 00m
Icelandair
Deal found 15/7£493
Sun 13/915:55
SEA
-
LHR
1 stop16h 05m
Scandinavian Airlines
Sat 19/906:40
LHR
-
SEA
1 stop15h 05m
Scandinavian Airlines
Deal found 14/7£493
Thu 27/823:25
SEA
-
LGW
1 stop31h 15m
Icelandair
Sat 5/915:40
LGW
-
SEA
1 stop13h 00m
Icelandair
Deal found 14/7£494
Sat 28/1107:55
SEA
-
LHR
2 stops16h 10m
Multiple Airlines
Tue 1/1212:15
LHR
-
SEA
1 stop12h 45m
Multiple Airlines
Deal found 15/7£494
Tue 1/919:00
SEA
-
STN
2 stops21h 10m
Multiple Airlines
Mon 7/908:15
STN
-
SEA
2 stops35h 30m
Multiple Airlines
Deal found 14/7£495
Tue 25/815:40
SEA
-
LGW
1 stop15h 00m
Icelandair
Tue 8/913:00
LGW
-
SEA
1 stop15h 40m
Icelandair
Deal found 13/7£495
Mon 5/1019:00
SEA
-
LHR
2 stops15h 30m
Multiple Airlines
Sun 18/1021:25
LHR
-
SEA
1 stop28h 30m
Multiple Airlines
Deal found 14/7£495
Thu 27/819:00
SEA
-
STN
2 stops21h 30m
Multiple Airlines
Thu 3/907:20
STN
-
SEA
2 stops21h 20m
Multiple Airlines
Deal found 13/7£496

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 15 July 2026.

Round-trip from

£486

One-way from

£173

Popular in

June

Cheapest in

January

Average price

£762

Good round-trip deal

£710 or less

Good one-way deal

£279 or less
Icelandair
  • Icelandair
  • 6/10-21/10
  • 2 total stops
  • 30h 10m total
  • Washington to London
Search Deals
14/10
  • 14/10
  • 2 total stops
  • 35h 15m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 22% potential increase in price (£128 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£20 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 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 15 July 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 8/12

15:40-15:05

1 stop15h 25m

London Luton

Sat 12/12

07:00-17:00

1 stop18h 00m

£516

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Sun 6/12

14:35-15:05

1 stop16h 30m

London Luton

Fri 11/12

06:00-17:00

1 stop19h 00m

£522

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Fri 4/12

14:35-13:55

1 stop15h 20m

London Luton

Tue 8/12

07:00-17:00

1 stop18h 00m

£535

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 19/10

19:00-14:40

1 stop11h 40m

London Gatwick

Sat 31/10

11:55-18:00

1 stop13h 05m

£558

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Sun 26/7

19:00-11:45

1 stop32h 45m

London Gatwick

Tue 18/8

15:40-11:45

1 stop28h 05m

£566

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 18/8

15:55-17:40

1 stop17h 45m

London Heathrow

Mon 24/8

21:05-13:45

2 stops24h 40m

£594

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Thu 17/9

19:00-18:25

2 stops15h 25m

London Luton

Mon 21/9

18:05-09:40

3 stops47h 35m

£614

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 20/10

21:50-15:35

Nonstop9h 45m

London Heathrow

Fri 23/10

11:45-16:35

1 stop12h 50m

£636

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 20/10

18:20-12:10

Nonstop9h 50m

London Heathrow

Tue 27/10

06:20-12:25

1 stop13h 05m

£641

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Mon 16/11

14:05-15:45

1 stop17h 40m

London Gatwick

Wed 25/11

10:00-22:12

2 stops20h 12m

£653

Flights are sorted by cheapest return flights first.

Deals found on 10/7

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 £239). Flying from State of Washington to London in November is currently the most expensive (average of £1,579). 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 15 July 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 15 July 2026.

The most flights from USWA to LON are scheduled on a Tuesday (23 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (17 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 34 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?

    Icelandair, Scandinavian Airlines, and KLM can get you from State of Washington to London in just under 9h 45m. Your travel time can differ by up to 8h. The distance from State of Washington to London is about 4783 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 £201. Virgin Atlantic flights start at £218 while deals on British Airways start at £307 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 (83%), Air France (83%), Delta (83%).

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

    On average you can expect to pay £539 for a flight from State of Washington to London. The cheapest flight overall is £200 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at £420.

  • 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 £239). Flying from State of Washington to London in November is currently the most expensive (average of £1,579). 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

See prices for flight routes from nearby airports that may be better suited for you.
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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 15 July 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£354Average£684FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£368Average£590FlexibilityNo 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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