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Cheap flights from London to Washington from £377

LON — SEA
25 Sep — 2 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

Thu 22/1021:25 -
1 stop31h 15m
Mon 2/1114:35 -
1 stop12h 15m
Deal found 24/8£482
Thu 24/906:15 -
1 stop13h 00m
Sat 10/1021:50 -
Nonstop9h 45m
Deal found 24/8£483
Mon 31/821:25 -
1 stop22h 20m
Mon 7/915:40 -
1 stop12h 15m
Deal found 23/8£484
Mon 31/815:40 -
1 stop28h 05m
Mon 7/919:00 -
1 stop11h 40m
Deal found 23/8£485
Tue 20/1011:00 -
2 stops17h 40m
Tue 27/1015:35 -
2 stops17h 45m
Deal found 23/8£488
Tue 6/1017:50 -
2 stops32h 05m
Tue 13/1019:00 -
2 stops15h 25m
Deal found 22/8£489
Tue 1/913:00 -
1 stop12h 55m
Sat 31/1015:35 -
1 stop12h 20m
Deal found 24/8£490
Tue 1/921:25 -
1 stop22h 20m
Sat 31/1015:35 -
1 stop12h 15m
Deal found 24/8£491
Mon 21/921:25 -
1 stop28h 30m
Tue 29/919:00 -
1 stop32h 55m
Deal found 21/8£491
Sat 3/1021:25 -
1 stop31h 15m
Thu 8/1019:00 -
1 stop32h 55m
Deal found 22/8£493
Thu 22/1010:20 -
2 stops18h 20m
Wed 28/1015:35 -
2 stops23h 05m
Deal found 23/8£494
Wed 21/1015:40 -
1 stop34h 15m
Thu 29/1015:35 -
1 stop12h 20m
Deal found 22/8£494

Find flight deals from London to Washington

Round-trip from

£482

One-way from

£377

Popular in

August

Cheapest in

February

Average price

£629

Good round-trip deal

£578 or less

Good one-way deal

£567 or less
Icelandair
  • Icelandair
  • 22/10-28/10
  • 2 total stops
  • 40h 45m total
  • London to Washington
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Icelandair
  • Icelandair
  • 31/10
  • 1 total stop
  • 13h 05m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£26 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 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

Thu 24/9

09:50-17:10

1 stop15h 20m

Seattle/Tacoma Intl

Fri 2/10

20:20-13:45

Nonstop9h 25m

£520

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Thu 18/2

09:25-11:25

Nonstop10h 00m

Seattle/Tacoma Intl

Wed 3/3

10:32-10:00

1 stop15h 28m

£524

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Thu 8/10

09:25-18:32

2 stops17h 07m

Seattle/Tacoma Intl

Wed 21/10

07:00-08:25

2 stops17h 25m

£525

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 22/9

06:30-11:55

1 stop13h 25m

Seattle/Tacoma Intl

Thu 1/10

13:56-11:55

1 stop13h 59m

£531

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 6/10

07:25-18:52

2 stops19h 27m

Seattle/Tacoma Intl

Tue 13/10

10:42-10:40

2 stops15h 58m

£534

LondonSeattle

LCY London City - SEA Seattle/Tacoma Intl

LCYSEA

London City

Wed 7/10

09:15-18:32

2 stops17h 17m

Seattle/Tacoma Intl

Wed 14/10

15:18-17:25

2 stops18h 07m

£541

LondonSeattle

LCY London City - SEA Seattle/Tacoma Intl

LCYSEA

London City

Thu 8/10

09:15-18:32

2 stops17h 17m

Seattle/Tacoma Intl

Wed 21/10

07:00-12:35

2 stops21h 35m

£541

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Wed 30/9

10:25-23:20

2 stops20h 55m

Seattle/Tacoma Intl

Sun 11/10

13:30-16:00

1 stop18h 30m

£551

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 27/10

09:25-12:25

Nonstop10h 00m

Seattle/Tacoma Intl

Sun 8/11

18:45-12:10

Nonstop9h 25m

£554

LondonSeattle

LTN London Luton - SEA Seattle/Tacoma Intl

LTNSEA

London Luton

Thu 8/10

05:40-16:00

2 stops18h 20m

Seattle/Tacoma Intl

Thu 15/10

18:05-23:00

2 stops20h 55m

£557

Flights are sorted by cheapest return flights first.

Deals found on 25/8

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 £489). Flying from London to State of Washington in December is currently the most expensive (average of £650). 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 Monday (24 on average). You will have fewer flight options on Sunday, which is when the least amount of flights are scheduled (13 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 £506 and £672 in October.
The cheapest return price found within the last 5 days was £482 on Icelandair (22 Oct–2 Nov).

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 80 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
12,841 reviews
Check prices

Food

7.0

Boarding

8.1

Entertainment

7.0

Overall

7.9

Crew

8.5

Comfort

7.8

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
12,841 reviews
Alaska Airlines
7.9
Good
12,841 reviews
Check prices

Food

7.0

Boarding

8.1

Entertainment

7.0

Overall

7.9

Crew

8.5

Comfort

7.8

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
1,565 reviews
Alaska Airlines
7.9
Good
12,841 reviews
Check prices

Food

7.0

Boarding

8.1

Entertainment

7.0

Overall

7.9

Crew

8.5

Comfort

7.8

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
695 reviews
Alaska Airlines
7.9
Good
12,841 reviews
Check prices

Food

7.0

Boarding

8.1

Entertainment

7.0

Overall

7.9

Crew

8.5

Comfort

7.8

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
738 reviews
Alaska Airlines
7.9
Good
12,841 reviews
Check prices

Food

7.0

Boarding

8.1

Entertainment

7.0

Overall

7.9

Crew

8.5

Comfort

7.8

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
8,194 reviews
Alaska Airlines
7.9
Good
12,841 reviews
Check prices

Food

7.0

Boarding

8.1

Entertainment

7.0

Overall

7.9

Crew

8.5

Comfort

7.8

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 13h 25m. Fly via British Airways, SWISS, or Lufthansa 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 £330. Icelandair flights start at £334 while deals on Virgin Atlantic start at £361 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%), American Airlines (75%), KLM (75%).

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

    On average you can expect to pay £1,415 for a flight from London to State of Washington. The cheapest flight overall is £312 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £372.

  • 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 £489). Flying from London to State of Washington in December is currently the most expensive (average of £650). 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 John F Kennedy Intl flights
Heathrow to Newark flights
Heathrow to LaGuardia flights
Gatwick to Newark flights
London City to John F Kennedy Intl flights
Gatwick to John F Kennedy Intl flights
Stansted to John F Kennedy Intl flights
Luton to John F Kennedy Intl flights
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Heathrow to Miami flights
Heathrow to Orlando flights
Gatwick to LaGuardia flights
Stansted to Newark flights
London City to Newark flights
Luton to Newark flights
Manchester to John F Kennedy Intl flights
Heathrow to Boston flights
Heathrow to Las Vegas flights
Heathrow to San Francisco flights
Manchester to Orlando flights
Heathrow to O'Hare Intl flights
Gatwick to Orlando flights
Heathrow to Hobby flights
Heathrow to Atlanta flights
Heathrow to Dallas/Fort Worth flights
Gatwick to Los Angeles flights
Gatwick to Miami flights
Stansted to Orlando flights
Heathrow to Dulles Intl flights
Stansted to Miami flights
London City to Miami flights
Stansted to Los Angeles flights
Heathrow to Seattle flights
Manchester to Newark flights
London City to Los Angeles flights
Heathrow to Baltimore flights
Heathrow to George Bush Intcntl flights
London City to Orlando flights
Gatwick to Boston flights
Heathrow to Tampa flights
Manchester to LaGuardia flights
Luton to Miami flights
London City to Boston flights
Heathrow to Ontario flights
Edinburgh to Newark flights
Luton to Orlando flights
Gatwick to Las Vegas flights
Luton to Los Angeles flights
Edinburgh to John F Kennedy Intl flights
Stansted to Boston flights

Top 10 airlines flying from London to Washington

AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£330Average£366FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£336Average£501FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£385Average£625FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£411Average£482FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£417Average£777FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£427Average£604FlexibilityNo cancel feeOn-time75%
Search KLM flights
DeltaCheapest£435Average£640FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£444Average£614FlexibilityNo cancel feeOn-time77%
Search Air France flights
British AirwaysCheapest£447Average£624FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Alaska AirlinesCheapest£464Average£562FlexibilityNo 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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