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Cheap flights from Washington to London from £194

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 4/10. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
18 Oct — 25 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Washington to London

Keep the following information in mind while searching for Washington to London flight deals. Data was last updated 18 September 2025.

Round-trip from

£372

One-way from

£194

Popular in

June

Cheapest in

October

Average price

£511

Good round-trip deal

£484 or less

Good one-way deal

£340 or less
Icelandair
  • Icelandair
  • 1/10-15/10
  • 2 total stops
  • 24h 40m total
  • Washington to London
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4/10
  • 4/10
  • 2 total stops
  • 40h 21m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£74 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Washington to London (LON).
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Price to beat on a one-way flight from Washington to London (LON).
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Find 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 18 September 2025.

Wed 1/1019:00SEA - LGW
1 stop11h 40mIcelandair
Wed 15/1015:40LGW - SEA
1 stop13h 00mIcelandair
Deal found 16/9£372
Mon 22/917:35SEA - LHR
Nonstop9h 45mVirgin Atlantic
Tue 7/1017:35LHR - SEA
1 stop25h 40mVirgin Atlantic
Deal found 15/9£372
Wed 12/1116:48SEA - LHR
Nonstop9h 42mDelta
Wed 19/1106:20LHR - SEA
1 stop15h 00mDelta
Deal found 16/9£373
Wed 12/1116:48SEA - LHR
Nonstop9h 42mAir France
Thu 20/1106:20LHR - SEA
1 stop13h 05mAir France
Deal found 15/9£374
Thu 6/1114:35SEA - LGW
1 stop12h 20mIcelandair
Wed 19/1111:55LGW - SEA
1 stop13h 05mIcelandair
Deal found 15/9£374
Tue 14/1017:35SEA - LHR
Nonstop9h 45mDelta
Thu 23/1006:30LHR - SEA
1 stop13h 20mDelta
Deal found 17/9£374
Tue 18/1114:35SEA - LGW
1 stop12h 20mIcelandair
Thu 27/1111:55LGW - SEA
1 stop13h 05mIcelandair
Deal found 16/9£375
Wed 1/1013:30SEA - LHR
Nonstop9h 20mBritish Airways
Tue 14/1009:25LHR - SEA
Nonstop9h 45mBritish Airways
Deal found 15/9£375
Wed 12/1105:50SEA - LHR
2 stops20h 20mMultiple Airlines
Thu 20/1119:15LHR - SEA
1 stop26h 05mMultiple Airlines
Deal found 17/9£376
Wed 15/1015:45SEA - STN
2 stops16h 35mMultiple Airlines
Wed 22/1008:15STN - SEA
2 stops17h 35mMultiple Airlines
Deal found 17/9£377
Mon 1/1214:35SEA - LGW
2 stops18h 45mMultiple Airlines
Sun 14/1208:25LGW - SEA
2 stops16h 35mMultiple Airlines
Deal found 15/9£377
Mon 22/914:25SEA - LHR
1 stop18h 50mDelta
Tue 7/1006:15LHR - SEA
1 stop19h 25mDelta
Deal found 15/9£377

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 18 September 2025.
Use the filters below to find and compare flights from Washington to London that are best for you.

Fly from

Washington

Fly to

London

Route

Depart

Return

Price

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 12/11

16:48-10:30

Nonstop9h 42m

London Heathrow

Wed 19/11

06:20-13:20

1 stop15h 00m

£373

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 21/10

17:31-07:25

1 stop29h 54m

London Heathrow

Tue 28/10

14:30-14:31

1 stop31h 01m

£374

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 27/10

17:45-10:30

Nonstop9h 45m

London Heathrow

Tue 11/11

06:20-11:25

1 stop13h 05m

£374

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 5/11

16:48-10:30

Nonstop9h 42m

London Heathrow

Wed 12/11

06:20-13:20

1 stop15h 00m

£374

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 1/10

20:25-14:15

Nonstop9h 50m

London Heathrow

Tue 14/10

06:30-16:05

1 stop17h 35m

£374

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 29/10

09:25-07:05

1 stop14h 40m

London Heathrow

Tue 11/11

06:20-11:25

1 stop13h 05m

£377

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 18/11

05:50-11:50

1 stop22h 00m

London Heathrow

Thu 27/11

06:50-20:54

2 stops22h 04m

£379

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Mon 29/9

17:35-11:20

Nonstop9h 45m

London Heathrow

Fri 10/10

18:00-20:25

Nonstop10h 25m

£379

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Wed 5/11

14:35-10:55

1 stop12h 20m

London Gatwick

Fri 21/11

11:55-17:00

1 stop13h 05m

£380

SeattleLondon

SEA - LGW

SEALGW

Seattle/Tacoma Intl

Fri 6/3

14:35-10:55

1 stop12h 20m

London Gatwick

Tue 31/3

15:40-21:10

1 stop13h 30m

£380

Flights are sorted by cheapest return flights first.

Deals found on 16/9

Showing 1-10 of 60 results
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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 £112). Flying from State of Washington to London in August is currently the most expensive (average of £164). 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 18 September 2025.

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 18 September 2025.

The most flights from USWA to LON are scheduled on a Monday (21 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (15 on average).

How much does it cost for a return flight 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?

    Delta, United Airlines, and Icelandair can get you from State of Washington to London in just under 9h 42m. Your travel time can differ by up to 20h 12m. 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 Scandinavian Airlines, which is currently one of the cheapest options available, starting at £228. JetBlue flights start at £256 while deals on SWISS start at £289 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 Portland - London Heathrow.

  • 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: Aeromexico (90%), KLM (83%), Air France (83%).

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

    On average you can expect to pay £869 for a flight from State of Washington to London. The cheapest flight overall is £277 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at £345.

  • 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 £112). Flying from State of Washington to London in August is currently the most expensive (average of £164). 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 4 airlines flying from Washington to London

Discover the top 4 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 18 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£343Average£503FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£347Average£671FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£362Average£595FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
IcelandairCheapest£404Average£561FlexibilityNo cancel feeOn-time76%
Search Icelandair 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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