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Cheap flights from Washington to London from £177

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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
7 Sep — 14 Sep1
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 August 2026.

Fri 16/1015:40 -
1 stop12h 15m
Sat 14/1112:15 -
1 stop12h 45m
Deal found 4/8£465
Tue 6/1014:10 -
2 stops22h 25m
Sun 11/1018:55 -
3 stops31h 37m
Deal found 3/8£468
Sun 27/908:00 -
3 stops27h 55m
Tue 13/1007:05 -
2 stops17h 54m
Deal found 4/8£469
Sun 11/1015:40 -
1 stop12h 15m
Sun 8/1112:15 -
1 stop12h 45m
Deal found 4/8£469
Tue 22/915:55 -
1 stop14h 40m
Tue 6/1007:10 -
1 stop14h 35m
Deal found 3/8£470
Mon 23/1108:31 -
2 stops15h 34m
Mon 7/1212:15 -
1 stop12h 45m
Deal found 5/8£470
Sat 19/915:55 -
1 stop21h 45m
Mon 21/921:05 -
2 stops24h 40m
Deal found 3/8£471
Sun 11/1015:40 -
1 stop12h 15m
Mon 9/1112:15 -
1 stop12h 45m
Deal found 4/8£471
Tue 24/1108:31 -
2 stops15h 34m
Tue 29/1212:15 -
1 stop12h 45m
Deal found 3/8£472
Fri 25/915:55 -
1 stop15h 30m
Sun 11/1007:05 -
1 stop14h 40m
Deal found 3/8£477
Wed 30/915:40 -
2 stops19h 35m
Wed 7/1020:45 -
3 stops29h 10m
Deal found 3/8£478
Tue 15/923:08 -
2 stops35h 22m
Fri 18/918:05 -
2 stops27h 40m
Deal found 3/8£478

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 August 2026.

Round-trip from

£465

One-way from

£177

Popular in

June

Cheapest in

January

Average price

£615

Good round-trip deal

£704 or less

Good one-way deal

£277 or less
Icelandair
  • Icelandair
  • 16/10-14/11
  • 2 total stops
  • 25h 00m total
  • Washington to London
Search Deals
6/9
  • 6/9
  • 2 total stops
  • 52h 40m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 21% potential increase in price (£123 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 August 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 August 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 Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Sun 13/9

15:55-19:55

2 stops20h 00m

London Heathrow

Wed 23/9

07:05-23:20

2 stops24h 15m

£579

SeattleLondon

SEA Seattle/Tacoma Intl - LTN London Luton

SEALTN

Seattle/Tacoma Intl

Sun 18/10

17:40-18:25

2 stops16h 45m

London Luton

Sun 1/11

17:25-15:55

2 stops30h 30m

£580

SeattleLondon

SEA Seattle/Tacoma Intl - LTN London Luton

SEALTN

Seattle/Tacoma Intl

Sun 25/10

19:10-15:05

1 stop12h 55m

London Luton

Thu 5/11

06:00-17:00

1 stop19h 00m

£584

SeattleLondon

SEA Seattle/Tacoma Intl - LTN London Luton

SEALTN

Seattle/Tacoma Intl

Mon 21/9

08:00-20:55

3 stops28h 55m

London Luton

Wed 30/9

06:00-16:59

2 stops18h 59m

£623

SeattleLondon

SEA Seattle/Tacoma Intl - LTN London Luton

SEALTN

Seattle/Tacoma Intl

Sat 24/10

15:40-14:05

1 stop14h 25m

London Luton

Mon 2/11

08:00-17:00

1 stop17h 00m

£627

SeattleLondon

SEA Seattle/Tacoma Intl - LGW London Gatwick

SEALGW

Seattle/Tacoma Intl

Wed 4/11

06:00-09:00

2 stops19h 00m

London Gatwick

Tue 10/11

10:00-08:44

2 stops30h 44m

£644

PortlandLondon

PDX Portland - LHR London Heathrow

PDXLHR

Portland

Sun 1/11

07:00-06:20

1 stop15h 20m

London Heathrow

Wed 11/11

06:30-11:20

1 stop12h 50m

£650

SeattleLondon

SEA Seattle/Tacoma Intl - LHR London Heathrow

SEALHR

Seattle/Tacoma Intl

Sun 4/10

15:55-19:55

2 stops20h 00m

London Heathrow

Sun 18/10

19:50-23:04

2 stops35h 14m

£656

SeattleLondon

SEA Seattle/Tacoma Intl - LCY London City

SEALCY

Seattle/Tacoma Intl

Wed 4/11

06:00-08:50

2 stops18h 50m

London City

Tue 10/11

18:55-11:47

1 stop24h 52m

£657

PortlandLondon

PDX Portland - LCY London City

PDXLCY

Portland

Wed 18/11

09:32-07:15

2 stops37h 43m

London City

Wed 2/12

10:00-16:26

2 stops38h 26m

£679

Flights are sorted by cheapest return flights first.

Deals found on 4/8

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 £488). Flying from State of Washington to London in June is currently the most expensive (average of £902). 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 August 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 August 2026.

The most flights from USWA to LON are scheduled on a Tuesday (25 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (19 on average).

How much does it cost for a return flight from State of Washington to London?

Airfare is below average for this route at the moment.
State of Washington to London flights typically cost between £488 and £726 in October.
The cheapest return price found within the last 5 days was £465 on Icelandair (16 Oct–14 Nov).

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.

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 Delta can get you from State of Washington to London in just under 12h 15m. Your travel time can differ by up to 9h 30m. 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 £126. Virgin Atlantic flights start at £217 while deals on British Airways start at £242 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: SAUDIA (100%), KLM (84%), Air France (84%).

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

    On average you can expect to pay £529 for a flight from State of Washington to London. The cheapest flight overall is £241 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at £414.

  • 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 £488). Flying from State of Washington to London in June is currently the most expensive (average of £902). 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 3 airlines flying from Washington to London

Discover the top 3 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 August 2026.
AirlineCheapestAverageFlexibilityOn-time
Virgin AtlanticCheapest£367Average£622FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
British AirwaysCheapest£459Average£679FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Alaska AirlinesCheapest£489Average£729FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines 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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