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Cheap flights from London to Washington from £377

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 24/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
1 Apr — 8 Apr1
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 27 March 2025.

Round-trip from

£458

One-way from

£377

Popular in

August

Cheapest in

January

Average price

£525

Good round-trip deal

£560 or less

Good one-way deal

£613 or less
Icelandair
  • Icelandair
  • 2/6-16/6
  • 2 total stops
  • 44h 10m total
  • London to Washington
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24/5
  • 24/5
  • 3 total stops
  • 32h 45m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£85 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 March 2025
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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 27 March 2025.

Wed 16/421:25LHR - SEA
1 stop31h 15mIcelandair
Thu 24/419:00SEA - LHR
1 stop17h 20mIcelandair
Deal found 27/3£459
Sun 21/915:40LGW - SEA
1 stop13h 00mIcelandair
Sat 11/1015:45SEA - LGW
1 stop14h 55mIcelandair
Deal found 27/3£461
Wed 21/506:40LHR - SEA
1 stop15h 10mScandinavian Airlines
Mon 2/616:00SEA - LHR
1 stop16h 00mScandinavian Airlines
Deal found 27/3£462
Wed 10/906:55LHR - SEA
1 stop18h 04mLufthansa
Wed 24/910:00SEA - LHR
2 stops16h 00mLufthansa
Deal found 27/3£465
Thu 1/506:00LHR - SEA
2 stops24h 42mSWISS
Mon 12/514:40SEA - LHR
2 stops19h 10mSWISS
Deal found 27/3£467
Wed 10/909:55LHR - SEA
1 stop14h 10mKLM
Thu 18/920:25SEA - LHR
Nonstop9h 50mKLM
Deal found 27/3£470
Wed 21/507:05STN - SEA
1 stop14h 45mMultiple Airlines
Mon 2/616:00SEA - STN
1 stop16h 15mMultiple Airlines
Deal found 27/3£473
Sat 26/412:05LHR - SEA
1 stop17h 36mAir Canada
Sat 3/507:05SEA - LHR
1 stop18h 55mAir Canada
Deal found 27/3£474
Wed 23/407:40LHR - SEA
1 stop17h 19mBritish Airways
Wed 30/420:20SEA - LHR
Nonstop9h 20mBritish Airways
Deal found 27/3£476
Tue 29/419:20LCY - SEA
2 stops33h 55mMultiple Airlines
Sun 4/514:15SEA - LCY
2 stops38h 15mMultiple Airlines
Deal found 26/3£478
Mon 21/413:25LHR - SEA
Nonstop10h 20mVirgin Atlantic
Mon 5/517:35SEA - LHR
Nonstop9h 45mVirgin Atlantic
Deal found 27/3£478
Sat 19/414:10LHR - SEA
1 stop12h 18mUnited Airlines
Sun 27/405:14SEA - LHR
1 stop20h 26mUnited Airlines
Deal found 27/3£481

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 27 March 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

Wed 16/4

21:25-20:40

1 stop31h 15m

Seattle/Tacoma Intl

Thu 24/4

19:00-20:20

1 stop17h 20m

£459

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sun 21/9

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Sat 11/10

15:45-14:40

1 stop14h 55m

£461

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 21/5

06:40-13:50

1 stop15h 10m

Seattle/Tacoma Intl

Mon 2/6

16:00-16:00

1 stop16h 00m

£462

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 10/9

06:55-16:59

1 stop18h 04m

Seattle/Tacoma Intl

Wed 24/9

10:00-10:00

2 stops16h 00m

£465

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 1/5

06:00-22:42

2 stops24h 42m

Seattle/Tacoma Intl

Mon 12/5

14:40-17:50

2 stops19h 10m

£467

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 10/9

09:55-16:05

1 stop14h 10m

Seattle/Tacoma Intl

Thu 18/9

20:25-14:15

Nonstop9h 50m

£470

LondonSeattle

STN - SEA

STNSEA

London Stansted

Wed 21/5

07:05-13:50

1 stop14h 45m

Seattle/Tacoma Intl

Mon 2/6

16:00-16:15

1 stop16h 15m

£473

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 26/4

09:30-21:41

2 stops20h 11m

Seattle/Tacoma Intl

Sat 3/5

07:05-06:30

1 stop15h 25m

£474

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 23/4

07:40-16:59

1 stop17h 19m

Seattle/Tacoma Intl

Wed 30/4

20:20-13:40

Nonstop9h 20m

£476

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 21/4

13:25-15:45

Nonstop10h 20m

Seattle/Tacoma Intl

Mon 5/5

17:35-11:20

Nonstop9h 45m

£478

Flights are sorted by cheapest return flights first.

Deals found on 27/3

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 27 March 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.

Rainfall in Washington by month

Plan your trip to Washington by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in State of Washington ranges from 18.0 - 168.0 inches per month. November is typically the wettest month, when rainfall can reach 168.0 mm. July is typically the driest time to visit State of Washington when rainfall is around 18.0 mm.

Temperature in Washington by month

Plan your trip to Washington by taking into account the average temperature totals by month.

If weather is an important factor for your trip to State of Washington, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 19.0 C. Travellers hoping to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 5.0 C).

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 27 March 2025.
See what other customers who have flown with Delta, KLM and Finnair from London to Washington have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very Good
7,895 reviews
Check prices

Comfort

8.0

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very Good
7,895 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Comfort

8.0

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
KLM
7.8
Good
1,319 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Comfort

8.0

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Finnair
7.6
Good
1,267 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Comfort

8.0

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Austrian Airlines
7.5
Good
769 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Comfort

8.0

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
SWISS
7.5
Good
1,570 reviews
Delta
8.0
Very Good
7,895 reviews
Check prices

Comfort

8.0

Overall

8.0

Entertainment

7.9

Boarding

8.2

Food

7.3

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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 WestJet, which is currently one of the cheapest options available, starting at £389. Aer Lingus flights start at £409 while deals on Icelandair start at £418 one-way.

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

    While some choose either London Gatwick - Seattle/Tacoma Intl or London City - 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 (98%), Singapore Airlines (98%), KLM (92%).

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

    On average you can expect to pay £1,884 for a flight from London to State of Washington. The cheapest flight overall is £481 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £401.

  • 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 27 March 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£8Average£693FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£338Average£529FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£400Average£593FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£410Average£592FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£421Average£660FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£422Average£650FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£430Average£594FlexibilityNo cancel feeOn-time76%
Search Finnair flights
DeltaCheapest£446Average£859FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
British AirwaysCheapest£450Average£923FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£469Average£755FlexibilityNo 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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