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Cheap flights from London to Washington from £407

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 21/8. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
5 May — 12 May1
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 30 April 2025.

Round-trip from

£457

One-way from

£407

Popular in

August

Cheapest in

January

Average price

£529

Good round-trip deal

£545 or less

Good one-way deal

£627 or less
Icelandair
  • Icelandair
  • 20/9-11/10
  • 2 total stops
  • 27h 55m total
  • London to Washington
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21/8
  • 21/8
  • 1 total stop
  • 20h 05m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (£81 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2025
Search Deals
Price to beat on a round-trip flight from London (LON) to Washington.
Search Deals
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 30 April 2025.

Sat 20/915:40LGW - SEA
1 stop13h 00mIcelandair
Sat 11/1015:45SEA - LGW
1 stop14h 55mIcelandair
Deal found 29/4£457
Thu 8/521:25LHR - SEA
1 stop28h 25mIcelandair
Thu 22/523:30SEA - LHR
1 stop12h 50mIcelandair
Deal found 29/4£459
Wed 7/507:30LHR - SEA
2 stops19h 03mMultiple Airlines
Wed 14/510:00SEA - LHR
2 stops17h 50mMultiple Airlines
Deal found 30/4£460
Wed 17/907:40LHR - SEA
1 stop18h 10mBritish Airways
Thu 25/920:20SEA - LHR
Nonstop9h 20mBritish Airways
Deal found 29/4£462
Thu 5/619:30LHR - SEA
1 stop26h 20mScandinavian Airlines
Mon 9/616:00SEA - LHR
1 stop18h 30mScandinavian Airlines
Deal found 29/4£463
Thu 8/507:35STN - SEA
2 stops18h 15mMultiple Airlines
Thu 22/515:45SEA - STN
2 stops17h 40mMultiple Airlines
Deal found 29/4£465
Wed 10/907:25LHR - SEA
1 stop17h 34mUnited Airlines
Mon 15/922:55SEA - LHR
1 stop24h 00mUnited Airlines
Deal found 29/4£465
Thu 8/508:30LHR - SEA
2 stops19h 07mAir Canada
Thu 22/507:20SEA - LHR
1 stop18h 40mAir Canada
Deal found 30/4£471
Tue 13/518:35LGW - SEA
2 stops34h 56mSWISS
Sun 18/512:45SEA - LGW
2 stops45h 05mSWISS
Deal found 29/4£478
Mon 8/917:15LHR - SEA
2 stops27h 18mFinnair
Fri 26/907:15SEA - LHR
2 stops25h 00mFinnair
Deal found 30/4£485
Thu 11/920:55LHR - SEA
1 stop22h 50mVirgin Atlantic
Thu 25/917:35SEA - LHR
Nonstop9h 45mVirgin Atlantic
Deal found 30/4£486
Wed 17/909:05LCY - SEA
1 stop16h 45mBritish Airways
Thu 25/919:35SEA - LCY
1 stop14h 45mBritish Airways
Deal found 29/4£491

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 30 April 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

LGW - SEA

LGWSEA

London Gatwick

Sat 20/9

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Sat 11/10

15:45-14:40

1 stop14h 55m

£457

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 13/5

09:25-11:10

Nonstop9h 45m

Seattle/Tacoma Intl

Sun 18/5

23:59-06:15

2 stops22h 16m

£459

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 17/9

09:00-16:59

1 stop15h 59m

Seattle/Tacoma Intl

Thu 25/9

10:55-08:20

1 stop13h 25m

£461

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 17/9

07:40-17:50

1 stop18h 10m

Seattle/Tacoma Intl

Thu 25/9

20:20-13:40

Nonstop9h 20m

£462

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 5/6

19:30-13:50

1 stop26h 20m

Seattle/Tacoma Intl

Mon 9/6

16:00-18:30

1 stop18h 30m

£463

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 10/9

07:25-16:59

1 stop17h 34m

Seattle/Tacoma Intl

Mon 15/9

22:55-06:55

1 stop24h 00m

£465

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 14/5

13:05-20:40

1 stop15h 35m

Seattle/Tacoma Intl

Sat 17/5

19:00-20:20

1 stop17h 20m

£466

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Tue 13/5

18:35-21:31

2 stops34h 56m

Seattle/Tacoma Intl

Sun 18/5

12:45-17:50

2 stops45h 05m

£478

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 11/9

20:55-11:45

1 stop22h 50m

Seattle/Tacoma Intl

Thu 25/9

17:35-11:20

Nonstop9h 45m

£486

LondonSeattle

STN - SEA

STNSEA

London Stansted

Mon 19/5

06:10-17:50

2 stops19h 40m

Seattle/Tacoma Intl

Mon 26/5

15:45-16:05

2 stops16h 20m

£486

Flights are sorted by cheapest return flights first.

Deals found on 28/4

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 30 April 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 30 April 2025.

The most flights from LON to USWA are scheduled on a Monday (22 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (11 on average).

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 30 April 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
7,936 reviews
Check prices

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

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
7,936 reviews
Delta
8.0
Very Good
7,936 reviews
Check prices

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

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
1,334 reviews
Delta
8.0
Very Good
7,936 reviews
Check prices

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

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
1,275 reviews
Delta
8.0
Very Good
7,936 reviews
Check prices

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

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
1,588 reviews
Delta
8.0
Very Good
7,936 reviews
Check prices

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

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
Air France
7.4
Good
1,446 reviews
Delta
8.0
Very Good
7,936 reviews
Check prices

Crew

8.5

Food

7.3

Overall

8.0

Comfort

7.9

Boarding

8.2

Entertainment

7.9

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 Aer Lingus, which is currently one of the cheapest options available, starting at £409. WestJet flights start at £415 while deals on Icelandair start at £425 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: Singapore Airlines (94%), Aeromexico (92%), KLM (91%).

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

    On average you can expect to pay £1,371 for a flight from London to State of Washington. The cheapest flight overall is £473 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £438.

  • 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 30 April 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£8Average£672FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£326Average£507FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£386Average£574FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£396Average£572FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£399Average£609FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£407Average£618FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£415Average£568FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£433Average£1,015FlexibilityNo cancel feeOn-time70%
Search British Airways flights
DeltaCheapest£445Average£828FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Virgin AtlanticCheapest£450Average£719FlexibilityNo 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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