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Cheap flights from London to Washington from £360

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 13/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
23 apr — 30 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 18 aprile 2025.

Round-trip from

£457

One-way from

£360

Popular in

August

Cheapest in

January

Average price

£535

Good round-trip deal

£548 or less

Good one-way deal

£628 or less
Finnair
  • Finnair
  • 6/5-12/5
  • 2 total stops
  • 34h 25m total
  • London to Washington
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13/5
  • 13/5
  • 2 total stops
  • 22h 59m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 16% potential increase in price (£84 potential increase over avg. return price).
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Cheapest flight prices on average. 3% potential price decrease (£15 potential savings vs. average return price).
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Average for round-trip flights in April 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 18 aprile 2025.

mar 6/509:25LHR - SEA
Nonstop9h 45mFinnair
lun 12/501:10SEA - LHR
2 stops24h 40mFinnair
Deal found 18/4£457
mer 23/415:40LGW - SEA
1 stop13h 00mIcelandair
mer 7/515:45SEA - LGW
1 stop12h 00mIcelandair
Deal found 18/4£458
mer 30/417:00LCY - SEA
2 stops37h 42mLufthansa
mer 7/514:15SEA - LCY
1 stop18h 10mLufthansa
Deal found 17/4£458
gio 8/508:40LHR - SEA
2 stops18h 57mAir Canada
gio 15/511:30SEA - LHR
1 stop16h 20mAir Canada
Deal found 17/4£458
mer 7/510:55LGW - SEA
2 stops21h 15mMultiple Airlines
mer 22/1019:00SEA - LGW
1 stop11h 40mMultiple Airlines
Deal found 17/4£459
mar 6/513:05LHR - SEA
1 stop15h 35mIcelandair
lun 12/515:45SEA - LHR
1 stop20h 35mIcelandair
Deal found 18/4£461
gio 1/508:40LHR - SEA
2 stops18h 57mMultiple Airlines
dom 4/507:20SEA - LHR
1 stop18h 40mMultiple Airlines
Deal found 17/4£461
mer 7/510:50LHR - SEA
1 stop14h 09mUnited Airlines
mer 14/507:20SEA - LHR
1 stop15h 10mUnited Airlines
Deal found 16/4£462
lun 5/509:55LHR - SEA
1 stop14h 02mKLM
mer 14/517:35SEA - LHR
Nonstop9h 45mKLM
Deal found 17/4£470
mar 6/513:25LHR - SEA
Nonstop10h 20mVirgin Atlantic
lun 12/517:35SEA - LHR
Nonstop9h 45mVirgin Atlantic
Deal found 18/4£474
gio 5/619:30LHR - SEA
1 stop26h 20mScandinavian Airlines
ven 13/616:00SEA - LHR
1 stop33h 20mScandinavian Airlines
Deal found 17/4£475
mer 14/509:50LHR - SEA
1 stop15h 09mBritish Airways
gio 22/513:30SEA - LHR
Nonstop9h 20mBritish Airways
Deal found 16/4£482

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 18 aprile 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

mar 6/5

09:25-11:10

Nonstop9h 45m

Seattle/Tacoma Intl

lun 12/5

01:10-09:50

2 stops24h 40m

£457

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

mar 6/5

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

ven 31/10

15:35-10:55

1 stop12h 20m

£458

LondonSeattle

LCY - SEA

LCYSEA

London City

mer 30/4

17:00-22:42

2 stops37h 42m

Seattle/Tacoma Intl

mer 7/5

14:15-16:25

1 stop18h 10m

£458

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

gio 8/5

08:40-19:37

2 stops18h 57m

Seattle/Tacoma Intl

gio 15/5

11:30-11:50

1 stop16h 20m

£458

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

mer 7/5

10:55-00:10

2 stops21h 15m

Seattle/Tacoma Intl

mer 22/10

19:00-14:40

1 stop11h 40m

£459

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mar 6/5

13:05-20:40

1 stop15h 35m

Seattle/Tacoma Intl

lun 12/5

15:45-20:20

1 stop20h 35m

£461

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

gio 1/5

08:40-19:37

2 stops18h 57m

Seattle/Tacoma Intl

dom 4/5

07:20-10:00

1 stop18h 40m

£461

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mer 7/5

10:50-16:59

1 stop14h 09m

Seattle/Tacoma Intl

mer 14/5

07:20-06:30

1 stop15h 10m

£462

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

lun 5/5

09:55-15:57

1 stop14h 02m

Seattle/Tacoma Intl

mer 14/5

17:35-11:20

Nonstop9h 45m

£470

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

mar 6/5

13:25-15:45

Nonstop10h 20m

Seattle/Tacoma Intl

lun 12/5

17:35-11:20

Nonstop9h 45m

£474

Flights are sorted by cheapest return flights first.

Deals found on 17/4

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 18 aprile 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 18 aprile 2025.

The most flights from LON to USWA are scheduled on a Monday (22 on average). You will have fewer flight options on Tuesday, 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 18 aprile 2025.
See what other customers who have flown with Delta, Alaska Airlines and KLM 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
7,917 reviews
Check prices

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
7,917 reviews
Delta
8.0
Very Good
7,917 reviews
Check prices

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
Alaska Airlines
8.0
Very Good
9,887 reviews
Delta
8.0
Very Good
7,917 reviews
Check prices

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
1,329 reviews
Delta
8.0
Very Good
7,917 reviews
Check prices

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
1,269 reviews
Delta
8.0
Very Good
7,917 reviews
Check prices

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

Overall

8.0

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
7.5
Good
1,435 reviews
Delta
8.0
Very Good
7,917 reviews
Check prices

Entertainment

7.9

Boarding

8.2

Comfort

7.9

Food

7.3

Crew

8.5

Overall

8.0

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 £403. WestJet flights start at £404 while deals on Icelandair start at £456 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 £1,488 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 £313.

  • 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 18 aprile 2025.
AirlineCheapestAverageFlexibilityOn-time
Aer LingusCheapest£8Average£685FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
IcelandairCheapest£330Average£515FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£391Average£575FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£401Average£578FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£404Average£637FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£413Average£630FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£418Average£577FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£438Average£1,031FlexibilityNo cancel feeOn-time70%
Search British Airways flights
DeltaCheapest£451Average£839FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Virgin AtlanticCheapest£457Average£759FlexibilityNo 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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