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Cheap flights from Washington to London from £223

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 15/1. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
24 Dec — 31 Dec1
1 adult
1 adult, Economy, 0 bags

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 24 November 2025.

Round-trip from

£447

One-way from

£223

Popular in

June

Cheapest in

October

Average price

£504

Good round-trip deal

£497 or less

Good one-way deal

£469 or less
Icelandair
  • Icelandair
  • 8/4-12/4
  • 2 total stops
  • 43h 30m total
  • Washington to London
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15/1
  • 15/1
  • 3 total stops
  • 39h 12m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£81 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in November 2025
Search Deals
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

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 24 November 2025.

Mon 1/1214:35SEA - LGW
1 stop12h 20mIcelandair
Tue 9/1211:55LGW - SEA
1 stop13h 05mIcelandair
Deal found 22/11£447
Mon 1/1214:35SEA - LHR
1 stop12h 15mIcelandair
Tue 9/1212:15LHR - SEA
1 stop12h 45mIcelandair
Deal found 22/11£450
Mon 29/1214:35SEA - LGW
1 stop12h 20mIcelandair
Thu 29/111:55LGW - SEA
1 stop13h 05mIcelandair
Deal found 21/11£452
Wed 31/1208:00SEA - LHR
1 stop14h 40mAustrian Airlines
Mon 12/112:05LHR - SEA
1 stop16h 52mAustrian Airlines
Deal found 22/11£453
Wed 3/1214:35SEA - LGW
1 stop12h 20mIcelandair
Tue 9/1211:55LGW - SEA
1 stop13h 05mIcelandair
Deal found 22/11£463
Wed 3/1214:35SEA - LHR
1 stop12h 15mIcelandair
Wed 10/1212:15LHR - SEA
1 stop12h 45mIcelandair
Deal found 24/11£463
Sun 30/1114:35SEA - LGW
1 stop12h 20mIcelandair
Wed 10/1211:55LGW - SEA
1 stop13h 05mIcelandair
Deal found 22/11£465
Tue 9/1214:35SEA - LHR
1 stop12h 15mIcelandair
Tue 23/1220:35LHR - SEA
1 stop28h 25mIcelandair
Deal found 22/11£465
Sun 30/1114:35SEA - LHR
1 stop20h 55mIcelandair
Wed 10/1212:15LHR - SEA
1 stop12h 45mIcelandair
Deal found 22/11£466
Wed 26/1114:35SEA - LHR
1 stop20h 55mIcelandair
Wed 3/1220:35LHR - SEA
1 stop28h 25mIcelandair
Deal found 22/11£466
Mon 1/1214:35SEA - LHR
1 stop12h 15mIcelandair
Mon 8/1220:35LHR - SEA
1 stop28h 25mIcelandair
Deal found 22/11£469
Wed 31/1215:40SEA - LHR
1 stop12h 10mMultiple Airlines
Mon 12/106:00LHR - SEA
2 stops24h 43mMultiple Airlines
Deal found 24/11£472

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 24 November 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 - STN

SEASTN

Seattle/Tacoma Intl

Thu 5/2

05:50-00:40

3 stops34h 50m

London Stansted

Tue 10/2

21:20-13:20

2 stops24h 00m

£450

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Wed 25/2

14:35-12:55

1 stop14h 20m

London Luton

Wed 4/3

08:00-17:00

1 stop17h 00m

£452

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 10/2

13:02-21:40

2 stops24h 38m

London Heathrow

Wed 25/2

07:05-22:24

3 stops23h 19m

£453

SeattleLondon

SEA - LTN

SEALTN

Seattle/Tacoma Intl

Tue 13/1

14:35-17:50

2 stops19h 15m

London Luton

Tue 20/1

07:10-17:00

2 stops17h 50m

£453

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 20/4

10:00-21:40

2 stops27h 40m

London Heathrow

Thu 30/4

07:05-21:35

2 stops22h 30m

£456

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 28/4

10:00-17:40

2 stops23h 40m

London Heathrow

Tue 5/5

07:05-21:35

2 stops22h 30m

£456

PortlandLondon

PDX - LHR

PDXLHR

Portland

Thu 23/4

13:00-17:40

2 stops20h 40m

London Heathrow

Thu 30/4

07:05-21:35

2 stops22h 30m

£456

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 11/3

21:05-17:50

1 stop13h 45m

London Stansted

Wed 18/3

08:30-19:20

1 stop17h 50m

£458

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 23/2

10:24-18:30

2 stops24h 06m

London Heathrow

Mon 2/3

07:05-22:24

3 stops23h 19m

£458

PortlandLondon

PDX - STN

PDXSTN

Portland

Mon 16/3

15:45-14:20

2 stops15h 35m

London Stansted

Mon 23/3

06:30-18:00

2 stops18h 30m

£459

Flights are sorted by cheapest return flights first.

Deals found on 22/11

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, May is the cheapest month in which you can book a flight from State of Washington to London (average of £377). Flying from State of Washington to London in June is currently the most expensive (average of £604). 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 24 November 2025.

Unlike in the morning, when flights are generally more expensive, you can save up to 22% on flights from State of Washington to London by exploring options for tickets in the afternoon.

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 24 November 2025.

The most flights from USWA to LON are scheduled on a Saturday (21 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (12 on average).

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, United Airlines, and Delta can get you from State of Washington to London in just under 9h 45m. Your travel time can differ by up to 14h 53m. 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 £252. Scandinavian Airlines flights start at £262 while deals on WestJet start at £275 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: KLM (86%), Delta (84%), Virgin Atlantic (84%).

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

    On average you can expect to pay £532 for a flight from State of Washington to London. The cheapest flight overall is £393 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at £362.

  • 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, May is the cheapest month in which you can book a flight from State of Washington to London (average of £377). Flying from State of Washington to London in June is currently the most expensive (average of £604). 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 24 November 2025.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£362Average£608FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£377Average£629FlexibilityNo 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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