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Cheap flights from London to Washington from £382

LON — SEA
17 Oct — 24 Oct1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from London to Washington

Enter your travel dates to find the best prices.

Cheapest flights from London to Washington

Sun 27/910:15 -
2 stops16h 17m
Tue 13/1005:50 -
2 stops16h 40m
Deal found 16/9£429
Fri 27/1112:20 -
Nonstop10h 30m
Sun 6/1216:50 -
Nonstop9h 50m
Deal found 17/9£429
Tue 29/915:40 -
1 stop13h 00m
Wed 7/1015:40 -
1 stop15h 00m
Deal found 17/9£430
Tue 15/1209:30 -
1 stop34h 30m
Thu 7/110:54 -
2 stops16h 26m
Deal found 16/9£430
Thu 15/1015:40 -
1 stop13h 00m
Thu 5/1114:35 -
1 stop12h 20m
Deal found 17/9£431
Thu 24/910:00 -
1 stop14h 35m
Tue 29/913:50 -
1 stop11h 40m
Deal found 17/9£431
Wed 25/1106:00 -
2 stops22h 59m
Thu 10/1207:45 -
2 stops17h 35m
Deal found 17/9£431
Thu 15/1015:40 -
1 stop13h 00m
Sat 24/1019:10 -
1 stop11h 30m
Deal found 15/9£432
Sun 27/918:30 -
Nonstop10h 23m
Tue 13/1021:50 -
Nonstop9h 45m
Deal found 17/9£432
Thu 15/1009:20 -
1 stop15h 15m
Thu 22/1013:45 -
1 stop11h 45m
Deal found 17/9£432
Sat 31/1012:20 -
Nonstop10h 34m
Sat 5/1209:40 -
1 stop14h 05m
Deal found 16/9£432
Fri 23/1017:45 -
Nonstop10h 29m
Thu 5/1116:50 -
Nonstop9h 50m
Deal found 16/9£433

Find flight deals from London to Washington

Round-trip from

£429

One-way from

£382

Popular in

August

Cheapest in

February

Average price

£553

Good round-trip deal

£481 or less

Good one-way deal

£564 or less
Air Canada
  • Air Canada
  • 27/9-13/10
  • 4 total stops
  • 32h 57m total
  • London to Washington
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7/10-31/12
  • 7/10-31/12
  • 3 total stops
  • 59h 05m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£28 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).
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Average for round-trip flights in September 2026
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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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Cheapflights Fare Finder

 
Use the filters below to find and compare flights from London to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sun 1/11

06:30-20:05

2 stops20h 35m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£383

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Tue 15/12

10:00-20:42

2 stops18h 42m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£386

LondonSeattle

LCY London City - SEA Seattle/Tacoma Intl

LCYSEA

London City

Tue 1/12

09:15-23:13

2 stops21h 58m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£390

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sun 13/12

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£390

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 15/12

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£390

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Fri 11/12

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£391

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 14/12

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£391

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Sun 8/11

10:00-23:56

2 stops21h 56m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£392
Fastest return journey

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sat 14/11

14:55-16:50

Nonstop9h 55m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£393

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 15/12

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£393

Flights are sorted by cheapest return flights first.

Deals found on 12/9

Showing 1-10 of 60 resultsSorted by cheapest first
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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

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, February is the cheapest month in which you can book a flight from London to State of Washington (average of £494). Flying from London to State of Washington in December is currently the most expensive (average of £651). 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?

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

The most flights from LON to USWA are scheduled on a Tuesday (24 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (18 on average).

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

Airfare is below average for this route at the moment.
London to State of Washington flights typically cost between £482 and £646 in September.
The cheapest return price found within the last 5 days was £429 on Air Canada (27 Sept–13 Oct).

How far ahead should I book a flight from London to State of Washington?

The best time to book flights from London to State of Washington is 83 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

Reviews of airlines servicing Washington

Check out reviews from past customers who have flown with Alaska Airlines,KLM, andVirgin Atlantic 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.
Alaska Airlines
7.9
Good
12,940 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.0

Comfort

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Alaska Airlines
7.9
Good
12,940 reviews
Alaska Airlines
7.9
Good
12,940 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.0

Comfort

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
KLM
7.8
Good
1,578 reviews
Alaska Airlines
7.9
Good
12,940 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.0

Comfort

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Virgin Atlantic
7.4
Good
694 reviews
Alaska Airlines
7.9
Good
12,940 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.0

Comfort

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
Icelandair
6.9
Okay
746 reviews
Alaska Airlines
7.9
Good
12,940 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.0

Comfort

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.
British Airways
6.7
Okay
8,229 reviews
Alaska Airlines
7.9
Good
12,940 reviews
Check prices

Crew

8.5

Entertainment

7.0

Food

7.0

Comfort

7.8

Overall

7.9

Boarding

8.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jun 2026

LHR - SEA

It's my first time flying with Alaska Airlines. All in all it was very good. Excellent crew and the meal was really good .. best mashed potato!! Black point: not waking me up for breakfast. Having departed late from London and arriving in Seattle late at night, it would have been nice to have found a meal on the table when i woke up. Although the crew was very lovely, kind and helpful, I did find it a little regimented in their approach. Also the constant interruptions announcing what we were eating next and unnecessary announcements.

Related info for your journey

  • How long is the flight from London to State of Washington?

    There are many flights that can get you from London to State of Washington in 10h 05m. Fly via Delta, Virgin Atlantic, or Alaska Airlines to get the fastest option. The distance between London and State of Washington is about 4783 mi. This flight may include one or multiple stops.

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

    To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at £336. Icelandair flights start at £340 while deals on Virgin Atlantic start at £368 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 Stansted - 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: Scandinavian Airlines (82%), KLM (81%), SAUDIA (81%).

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

    On average you can expect to pay £1,838 for a flight from London to State of Washington. The cheapest flight overall is £318 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £310.

  • 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, February is the cheapest month in which you can book a flight from London to State of Washington (average of £494). Flying from London to State of Washington in December is currently the most expensive (average of £651). 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

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for London to Washington

Heathrow to Newark flights
Heathrow to John F Kennedy Intl flights
Gatwick to John F Kennedy Intl flights
Heathrow to LaGuardia flights
Stansted to John F Kennedy Intl flights
Gatwick to Newark flights
London City to John F Kennedy Intl flights
Luton to John F Kennedy Intl flights
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London City to Newark flights
Heathrow to Miami flights
Heathrow to Orlando flights
Stansted to Newark flights
Luton to Newark flights
Heathrow to Los Angeles flights
Manchester to John F Kennedy Intl flights
Heathrow to San Francisco flights
Heathrow to Dallas/Fort Worth flights
Heathrow to Boston flights
Gatwick to Orlando flights
Heathrow to Las Vegas flights
Heathrow to O'Hare Intl flights
Manchester to Orlando flights
Gatwick to Miami flights
London City to Miami flights
Manchester to Newark flights
Heathrow to Dulles Intl flights
Stansted to Miami flights
Manchester to LaGuardia flights
Gatwick to Los Angeles flights
Stansted to Orlando flights
London City to Orlando flights
Heathrow to Hobby flights
Heathrow to Baltimore flights
Heathrow to Seattle flights
London City to Los Angeles flights
Heathrow to Atlanta flights
Stansted to Los Angeles flights
Heathrow to Ontario flights
Luton to Miami flights
Luton to Los Angeles flights
Heathrow to George Bush Intcntl flights
Heathrow to Fort Lauderdale flights
Gatwick to San Francisco flights
Luton to LaGuardia flights
Edinburgh to Newark flights
Luton to Orlando flights
London City to San Francisco flights
Gatwick to Fort Lauderdale flights
Gatwick to Boston flights

Top 10 airlines flying from London to Washington

AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£336Average£516FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£337Average£516FlexibilityNo cancel feeOn-time76%
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United AirlinesCheapest£371Average£491FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£393Average£641FlexibilityNo cancel feeOn-timeN/A
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DeltaCheapest£400Average£652FlexibilityNo cancel feeOn-timeN/A
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Virgin AtlanticCheapest£418Average£807FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air FranceCheapest£430Average£615FlexibilityNo cancel feeOn-time77%
Search Air France flights
KLMCheapest£434Average£616FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£452Average£634FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Alaska AirlinesCheapest£456Average£568FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights

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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.

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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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