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Cheap flights from London to Washington from £389

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 31/7. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
18 Jun — 25 Jun1
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 13 June 2025.

Round-trip from

£475

One-way from

£389

Popular in

August

Cheapest in

January

Average price

£557

Good round-trip deal

£499 or less

Good one-way deal

£526 or less
British Airways
  • British Airways
  • 10/9-14/9
  • Nonstop
  • 19h 10m total
  • London to Washington
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31/7
  • 31/7
  • 3 total stops
  • 37h 41m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 15% potential increase in price (£75 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£13 potential savings vs. average return price).
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Average for round-trip flights in June 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 13 June 2025.

Wed 10/916:30LHR - SEA
Nonstop9h 50mBritish Airways
Sun 14/920:20SEA - LHR
Nonstop9h 20mBritish Airways
Deal found 11/6£475
Thu 10/715:40LGW - SEA
1 stop13h 00mIcelandair
Thu 24/723:30SEA - LGW
1 stop28h 15mIcelandair
Deal found 11/6£476
Wed 9/709:00LHR - SEA
1 stop16h 25mAir France
Wed 16/720:25SEA - LHR
Nonstop9h 50mAir France
Deal found 11/6£476
Sat 6/910:25LGW - SEA
1 stop19h 11mMultiple Airlines
Sat 4/1019:59SEA - LGW
1 stop30h 56mMultiple Airlines
Deal found 12/6£478
Wed 9/706:15LHR - SEA
1 stop13h 00mVirgin Atlantic
Tue 22/717:35SEA - LHR
Nonstop9h 45mVirgin Atlantic
Deal found 12/6£478
Fri 27/621:25LHR - SEA
1 stop22h 00mIcelandair
Mon 30/623:30SEA - LHR
1 stop28h 25mIcelandair
Deal found 12/6£479
Sun 31/811:45LHR - SEA
1 stop32h 00mDelta
Mon 8/907:13SEA - LHR
1 stop15h 12mDelta
Deal found 11/6£480
Wed 29/1013:30LCY - SEA
2 stops40h 45mSWISS
Sat 15/1115:37SEA - LCY
2 stops17h 28mSWISS
Deal found 12/6£482
Wed 9/710:30LHR - SEA
1 stop16h 41mFinnair
Wed 16/717:40SEA - LHR
1 stop13h 30mFinnair
Deal found 11/6£482
Fri 22/817:05STN - SEA
3 stops28h 45mMultiple Airlines
Sat 30/816:00SEA - STN
2 stops24h 20mMultiple Airlines
Deal found 12/6£486
Fri 22/807:30LHR - SEA
2 stops19h 06mMultiple Airlines
Sun 14/905:30SEA - LHR
2 stops17h 00mMultiple Airlines
Deal found 12/6£487
Wed 10/908:40LHR - SEA
2 stops18h 51mAir Canada
Sun 14/905:30SEA - LHR
2 stops17h 00mAir Canada
Deal found 11/6£489

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 13 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

Wed 10/9

16:30-18:20

Nonstop9h 50m

Seattle/Tacoma Intl

Sun 14/9

20:20-13:40

Nonstop9h 20m

£475

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Thu 10/7

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Thu 24/7

23:30-11:45

1 stop28h 15m

£476

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 9/7

09:00-17:25

1 stop16h 25m

Seattle/Tacoma Intl

Wed 16/7

20:25-14:15

Nonstop9h 50m

£476

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sat 6/9

10:25-21:36

1 stop19h 11m

Seattle/Tacoma Intl

Sat 4/10

19:59-10:55

1 stop30h 56m

£478

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 9/7

06:15-11:15

1 stop13h 00m

Seattle/Tacoma Intl

Tue 22/7

17:35-11:20

Nonstop9h 45m

£478

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 27/6

21:25-11:25

1 stop22h 00m

Seattle/Tacoma Intl

Mon 30/6

23:30-11:55

1 stop28h 25m

£479

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 31/8

11:45-11:45

1 stop32h 00m

Seattle/Tacoma Intl

Mon 8/9

20:25-14:15

Nonstop9h 50m

£480

LondonSeattle

LCY - SEA

LCYSEA

London City

Wed 29/10

13:30-23:15

2 stops40h 45m

Seattle/Tacoma Intl

Sat 15/11

15:37-17:05

2 stops17h 28m

£482

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 9/7

10:30-19:11

1 stop16h 41m

Seattle/Tacoma Intl

Wed 16/7

17:40-15:10

1 stop13h 30m

£482

LondonSeattle

STN - SEA

STNSEA

London Stansted

Fri 22/8

17:05-13:50

3 stops28h 45m

Seattle/Tacoma Intl

Sat 30/8

16:00-00:20

2 stops24h 20m

£486

Flights are sorted by cheapest return flights first.

Deals found on 11/6

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 13 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 13 June 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 13 June 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
7,950 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Overall

8.0

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
7,950 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Overall

8.0

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
1,358 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Overall

8.0

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
1,290 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Overall

8.0

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
1,463 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Overall

8.0

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
1,624 reviews
Delta
8.0
Very Good
7,950 reviews
Check prices

Food

7.3

Boarding

8.2

Crew

8.5

Entertainment

7.9

Comfort

7.9

Overall

8.0

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 £392. WestJet flights start at £399 while deals on Scandinavian Airlines start at £448 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 (97%), KLM (92%), Air France (92%).

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

    On average you can expect to pay £2,130 for a flight from London to State of Washington. The cheapest flight overall is £340 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £418.

  • 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 13 June 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£7Average£645FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£321Average£499FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£380Average£553FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£387Average£560FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£394Average£586FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£400Average£559FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£401Average£597FlexibilityNo cancel feeOn-time75%
Search KLM flights
Air CanadaCheapest£416Average£578FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
British AirwaysCheapest£421Average£995FlexibilityNo cancel feeOn-time70%
Search British Airways flights
DeltaCheapest£439Average£783FlexibilityNo cancel feeOn-timeN/A
Search Delta 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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