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Cheap flights from London to Washington from £387

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 27/8. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
1 Jul — 8 Jul1
1 adult

Cheap flight deals from London to Washington

Keep the following information in mind while searching for London to Washington flight deals. Data was last updated 26 June 2025.

Round-trip from

£473

One-way from

£387

Popular in

August

Cheapest in

January

Average price

£555

Good round-trip deal

£506 or less

Good one-way deal

£421 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 28/8-31/8
  • 3 total stops
  • 42h 45m total
  • London to Washington
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27/8
  • 27/8
  • 3 total stops
  • 21h 10m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£74 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 2025
Search Deals
Price to beat on a round-trip flight from London (LON) to Washington.
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Price to beat on a one-way flight from London (LON) to Washington.
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Find flight deals from London to Washington

Cheapest flights from London to Washington
Explore the most affordable flight options available from London to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 26 June 2025.

Thu 4/1206:00LHR - SEA
2 stops25h 14mSWISS
Wed 10/1213:18SEA - LHR
2 stops20h 32mSWISS
Deal found 26/6£472
Thu 28/819:30LHR - SEA
1 stop26h 20mScandinavian Airlines
Sun 31/816:00SEA - LHR
2 stops16h 25mScandinavian Airlines
Deal found 25/6£473
Sat 27/910:50LHR - SEA
2 stops19h 26mMultiple Airlines
Sat 4/1007:15SEA - LHR
1 stop18h 20mMultiple Airlines
Deal found 25/6£474
Thu 18/918:40LGW - SEA
2 stops34h 42mSWISS
Thu 25/915:28SEA - LGW
2 stops18h 22mSWISS
Deal found 24/6£475
Sat 25/1021:25LHR - SEA
1 stop28h 15mIcelandair
Mon 3/1114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 24/6£476
Sat 6/906:30LHR - SEA
1 stop13h 25mLufthansa
Sat 4/1010:00SEA - LHR
2 stops15h 35mLufthansa
Deal found 25/6£478
Mon 18/809:30LHR - SEA
1 stop19h 11mAir Canada
Tue 2/907:15SEA - LHR
1 stop18h 20mAir Canada
Deal found 23/6£480
Tue 26/810:00LGW - SEA
1 stop20h 05mMultiple Airlines
Wed 27/819:00SEA - LGW
1 stop11h 40mMultiple Airlines
Deal found 25/6£481
Mon 18/806:30LHR - SEA
1 stop17h 25mKLM
Tue 2/920:25SEA - LHR
Nonstop9h 50mKLM
Deal found 25/6£481
Wed 20/816:30LHR - SEA
Nonstop9h 50mBritish Airways
Tue 11/1113:35SEA - LHR
Nonstop9h 25mBritish Airways
Deal found 23/6£482
Mon 8/915:40LGW - SEA
1 stop13h 00mIcelandair
Fri 26/919:00SEA - LGW
1 stop11h 40mIcelandair
Deal found 24/6£483
Wed 10/913:25LHR - SEA
Nonstop10h 05mVirgin Atlantic
Mon 15/917:35SEA - LHR
Nonstop9h 45mVirgin Atlantic
Deal found 25/6£483

Cheapflights Fare Finder

Customise your flight search to find flights from London to Washington 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 26 June 2025.
Use the filters below to find and compare flights from London to Washington that are best for you.

Fly from

London

Fly to

Washington

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 4/12

06:00-23:14

2 stops25h 14m

Seattle/Tacoma Intl

Wed 10/12

13:18-17:50

2 stops20h 32m

£472

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 28/8

19:30-13:50

1 stop26h 20m

Seattle/Tacoma Intl

Sun 31/8

16:00-16:25

2 stops16h 25m

£473

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 27/9

10:50-22:16

2 stops19h 26m

Seattle/Tacoma Intl

Sat 4/10

07:15-09:35

1 stop18h 20m

£474

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Thu 18/9

18:40-21:22

2 stops34h 42m

Seattle/Tacoma Intl

Thu 25/9

15:28-17:50

2 stops18h 22m

£475

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 25/10

21:25-17:40

1 stop28h 15m

Seattle/Tacoma Intl

Mon 3/11

14:35-19:30

1 stop20h 55m

£476

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 6/9

06:30-11:55

1 stop13h 25m

Seattle/Tacoma Intl

Sat 4/10

10:00-09:35

2 stops15h 35m

£478

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 18/8

09:30-20:41

1 stop19h 11m

Seattle/Tacoma Intl

Tue 2/9

07:15-09:35

1 stop18h 20m

£480

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 26/8

10:00-22:05

1 stop20h 05m

Seattle/Tacoma Intl

Wed 27/8

19:00-14:40

1 stop11h 40m

£481

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 18/8

06:30-15:55

1 stop17h 25m

Seattle/Tacoma Intl

Tue 2/9

20:25-14:15

Nonstop9h 50m

£481

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 20/8

16:30-18:20

Nonstop9h 50m

Seattle/Tacoma Intl

Tue 11/11

13:35-07:00

Nonstop9h 25m

£482

Flights are sorted by cheapest return flights first.

Deals found on 24/6

Showing 1-10 of 60 results
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Best time to book a flight from London to Washington

Have a flexible travel schedule? Discover the best time to fly to Washington from London 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 London to Washington

What is the cheapest month to book a flight from London to State of Washington?

Currently, January is the cheapest month in which you can book a flight from London to State of Washington (average of £622). Flying from London to State of Washington in July is currently the most expensive (average of £946). 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 LON to WA?

Find hourly flight availability from London to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 26 June 2025.

When flying from London to State of Washington, 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 London to State of Washington

Explore weekly flight availability from London to Washington. 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 26 June 2025.

The most flights from LON to USWA are scheduled on a Wednesday (22 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (1 on average).

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

Reviews of airlines servicing Washington

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated 26 June 2025.
Check out reviews from past customers who have flown with Delta, KLM, andFinnair from London to Washington to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,963 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very Good
7,963 reviews
Delta
8.0
Very Good
7,963 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
KLM
7.8
Good
1,365 reviews
Delta
8.0
Very Good
7,963 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Finnair
7.6
Good
1,298 reviews
Delta
8.0
Very Good
7,963 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Air France
7.5
Good
1,470 reviews
Delta
8.0
Very Good
7,963 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
SWISS
7.5
Good
1,649 reviews
Delta
8.0
Very Good
7,963 reviews
Check prices

Boarding

8.2

Entertainment

7.9

Comfort

7.9

Overall

8.0

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from London to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines to fly from London to State of Washington one-way?

    To fly one-way, consider booking your trip with Aer Lingus, which is currently one of the cheapest options available, starting at £398. WestJet flights start at £409 while deals on Icelandair start at £417 one-way.

  • What are the most popular routes from London to State of Washington?

    While some choose either London Heathrow - Portland or London Gatwick - Seattle/Tacoma Intl, London Heathrow - Seattle/Tacoma Intl is the most popular route from London to State of Washington.

  • What are the most reliable airlines from London to State of Washington?

    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 London to State of Washington on time: Aeromexico (97%), KLM (93%), Air France (93%).

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

    On average you can expect to pay £1,855 for a flight from London to State of Washington. The cheapest flight overall is £330 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £398.

  • Can I find deals for flights from London to Washington that include hotel bookings?

    Yes. In addition to deals on London to Washington flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from London to Washington?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from London to Washington.

  • Can I find deals for business class flights from London to Washington?

    Yes. Cheapflights offers flight deals from London to Washington 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 London to State of Washington?

    Currently, January is the cheapest month in which you can book a flight from London to State of Washington (average of £622). Flying from London to State of Washington in July is currently the most expensive (average of £946). 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 London to Washington

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from London to Washington

Discover the top 10 airlines that operate flights from London to Washington. 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 26 June 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£7Average£653FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£320Average£495FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£379Average£557FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£385Average£545FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£393Average£584FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£398Average£556FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£400Average£595FlexibilityNo cancel feeOn-time75%
Search KLM flights
Air CanadaCheapest£414Average£576FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
British AirwaysCheapest£418Average£990FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£437Average£689FlexibilityNo 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 London to Washington?

Deals for London to Washington flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from London to Washington?

Cheapflights simply makes it quick and affordable to book flights from London to Washington by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from London to Washington with no change fees?

Yes, we can. To see specific flights from London to Washington with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from London to Washington become cheaper?

Yes! Start tracking prices for London to Washington flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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