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Cheap flights from Washington to London from £161

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 20/4. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
9 Apr — 16 Apr1
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 10 March 2026.

Tue 5/519:00
SEA
-
STN
2 stops21h 10m
Multiple Airlines
Tue 12/507:10
STN
-
SEA
2 stops16h 50m
Multiple Airlines
Deal found 5/3£433
Sun 19/419:00
SEA
-
LHR
2 stops16h 55m
Multiple Airlines
Sat 25/406:40
LHR
-
SEA
2 stops22h 00m
Multiple Airlines
Deal found 6/3£434
Thu 30/419:00
SEA
-
STN
2 stops21h 30m
Multiple Airlines
Sun 10/507:05
STN
-
SEA
2 stops16h 55m
Multiple Airlines
Deal found 8/3£434
Tue 7/408:00
SEA
-
STN
2 stops22h 35m
Multiple Airlines
Tue 14/407:10
STN
-
SEA
3 stops23h 43m
Multiple Airlines
Deal found 8/3£436
Thu 20/819:00
SEA
-
LHR
1 stop32h 55m
Icelandair
Thu 24/913:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Deal found 5/3£437
Mon 4/515:40
SEA
-
LHR
2 stops21h 40m
Multiple Airlines
Fri 8/506:40
LHR
-
SEA
2 stops22h 00m
Multiple Airlines
Deal found 5/3£438
Mon 20/415:40
SEA
-
LHR
2 stops21h 40m
Multiple Airlines
Tue 28/406:40
LHR
-
SEA
2 stops19h 15m
Multiple Airlines
Deal found 9/3£439
Thu 16/419:00
SEA
-
STN
2 stops21h 30m
Multiple Airlines
Mon 27/419:15
STN
-
SEA
2 stops28h 45m
Multiple Airlines
Deal found 8/3£440
Thu 23/419:00
SEA
-
LGW
1 stop11h 40m
Icelandair
Thu 30/415:40
LGW
-
SEA
1 stop13h 00m
Icelandair
Deal found 9/3£440
Mon 20/419:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Mon 27/421:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Deal found 6/3£440
Fri 17/419:00
SEA
-
STN
2 stops17h 30m
Multiple Airlines
Mon 27/419:15
STN
-
SEA
2 stops28h 45m
Multiple Airlines
Deal found 8/3£440
Tue 21/415:40
SEA
-
LGW
2 stops19h 35m
Multiple Airlines
Mon 4/520:45
LGW
-
SEA
3 stops29h 10m
Multiple Airlines
Deal found 5/3£440

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 10 March 2026.

Round-trip from

£433

One-way from

£161

Popular in

June

Cheapest in

October

Average price

£512

Good round-trip deal

£996 or less

Good one-way deal

£341 or less
5/5-12/5
  • 5/5-12/5
  • 4 total stops
  • 38h 00m total
  • Washington to London
Search Deals
20/4
  • 20/4
  • 2 total stops
  • 24h 50m total
  • Washington to London
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (£69 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 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 10 March 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 - LHR

SEALHR

Seattle/Tacoma Intl

Mon 31/8

23:00-21:35

1 stop14h 35m

London Heathrow

Wed 16/9

06:55-16:59

1 stop18h 04m

£524

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 7/4

08:55-09:20

2 stops16h 25m

London Heathrow

Mon 20/4

17:50-19:00

2 stops33h 10m

£541

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Sun 12/4

17:35-16:40

1 stop15h 05m

London City

Thu 23/4

10:00-16:30

1 stop14h 30m

£546

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 14/4

13:55-13:05

1 stop15h 10m

London Heathrow

Thu 23/4

06:30-11:10

1 stop12h 40m

£546

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 1/9

07:00-07:15

1 stop16h 15m

London Heathrow

Mon 7/9

19:15-11:10

1 stop23h 55m

£546

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Tue 21/4

06:00-07:55

2 stops17h 55m

London City

Tue 28/4

17:50-11:40

1 stop25h 50m

£549

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 13/4

13:55-13:05

1 stop15h 10m

London Heathrow

Thu 30/4

06:30-17:10

2 stops18h 40m

£554

PortlandLondon

PDX - LCY

PDXLCY

Portland

Tue 7/4

13:05-09:30

1 stop12h 25m

London City

Tue 14/4

19:00-11:10

1 stop24h 10m

£568

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 12/5

18:20-12:10

Nonstop9h 50m

London Heathrow

Thu 4/6

06:30-11:37

1 stop13h 07m

£570

PortlandLondon

PDX - LCY

PDXLCY

Portland

Wed 22/4

13:39-17:25

2 stops19h 46m

London City

Wed 29/4

09:15-22:34

2 stops21h 19m

£580

Flights are sorted by cheapest return flights first.

Deals found on 8/3

Showing 1-10 of 60 resultsSorted by cheapest first
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6

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, February is the cheapest month in which you can book a flight from State of Washington to London (average of £368). Flying from State of Washington to London in June is currently the most expensive (average of £562). 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 10 March 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 10 March 2026.

The most flights from USWA to LON are scheduled on a Tuesday (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?

    United Airlines, Delta, and KLM can get you from State of Washington to London in just under 14h 35m. Your travel time can differ by up to 35m. 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 £160. British Airways flights start at £292 while deals on Virgin Atlantic start at £293 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: American Airlines (87%), Alaska Airlines (87%), Aer Lingus (87%).

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

    On average you can expect to pay £917 for a flight from State of Washington to London. The cheapest flight overall is £278 while the most popular route, (Seattle/Tacoma Intl - London Heathrow) is currently priced at £418.

  • 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, February is the cheapest month in which you can book a flight from State of Washington to London (average of £368). Flying from State of Washington to London in June is currently the most expensive (average of £562). 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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Southend-on-Sea

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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 10 March 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest£353Average£518FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£368Average£582FlexibilityNo 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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