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Cheap flights from London to Washington from £384

LON — SEA
24 Nov — 1 Dec1
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

Sat 5/1206:20 -
1 stop15h 30m
Sat 12/1216:50 -
Nonstop9h 50m
Deal found 21/10£405
Fri 20/1106:35 -
1 stop14h 25m
Sun 29/1114:50 -
1 stop17h 00m
Deal found 21/10£406
Tue 17/1109:05 -
1 stop21h 55m
Tue 24/1106:00 -
1 stop16h 25m
Deal found 24/10£406
Fri 27/1112:20 -
Nonstop10h 30m
Sun 6/1207:38 -
1 stop15h 12m
Deal found 24/10£407
Wed 28/1014:30 -
1 stop14h 27m
Mon 16/1115:15 -
1 stop12h 35m
Deal found 20/10£408
Mon 14/1212:20 -
Nonstop10h 30m
Fri 8/116:55 -
Nonstop9h 45m
Deal found 24/10£409
Fri 27/1114:30 -
1 stop26h 57m
Sun 6/1219:05 -
1 stop32h 45m
Deal found 21/10£409
Tue 24/1113:25 -
2 stops16h 32m
Tue 1/1210:10 -
2 stops15h 10m
Deal found 20/10£410
Mon 14/1206:30 -
1 stop13h 20m
Sun 10/123:12 -
1 stop23h 38m
Deal found 24/10£411
Mon 14/1206:30 -
1 stop13h 20m
Thu 14/107:20 -
1 stop15h 30m
Deal found 23/10£412
Sat 7/1106:30 -
1 stop13h 17m
Sun 22/1116:50 -
Nonstop9h 50m
Deal found 21/10£412
Mon 23/1108:40 -
2 stops16h 13m
Sun 29/1116:50 -
Nonstop9h 50m
Deal found 21/10£413

Find flight deals from London to Washington

Round-trip from

£405

One-way from

£384

Popular in

August

Cheapest in

February

Average price

£531

Good round-trip deal

£424 or less

Good one-way deal

£391 or less
KLM
  • KLM
  • 5/12-12/12
  • 1 total stop
  • 25h 20m total
  • London to Washington
Search Deals
21/2-31/12
  • 21/2-31/12
  • 3 total stops
  • 38h 00m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£35 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 October 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

Mon 8/2

07:30-19:38

2 stops20h 08m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£388

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Mon 14/12

10:00-22:02

2 stops20h 02m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£389

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 18/1

07:30-12:22

2 stops36h 52m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£389

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Sun 17/1

10:00-22:21

2 stops20h 21m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£390

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Fri 12/3

10:00-22:04

2 stops20h 04m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£390
Fastest return journey

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 12/1

14:45-16:50

Nonstop10h 05m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£393

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sun 13/12

10:45-16:55

1 stop14h 10m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£393

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 7/4

17:00-19:10

Nonstop10h 10m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£394

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 12/4

08:15-17:10

1 stop16h 55m

Seattle/Tacoma Intl

Wed 21/4

13:35-06:50

Nonstop9h 15m

£406

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Fri 27/11

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Mon 7/12

16:50-10:40

Nonstop9h 50m

£412

Flights are sorted by cheapest return flights first.

Deals found on 20/10

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 £481). Flying from London to State of Washington in July is currently the most expensive (average of £645). 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.

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 £428 and £580 in December.
The cheapest return price found within the last 5 days was £405 on Multiple Airlines (5 Dec–12 Dec).

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
13,123 reviews
Check prices

Comfort

7.8

Overall

7.9

Boarding

8.1

Food

7.0

Crew

8.5

Entertainment

7.0

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
13,123 reviews
Alaska Airlines
7.9
Good
13,123 reviews
Check prices

Comfort

7.8

Overall

7.9

Boarding

8.1

Food

7.0

Crew

8.5

Entertainment

7.0

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
1,596 reviews
Alaska Airlines
7.9
Good
13,123 reviews
Check prices

Comfort

7.8

Overall

7.9

Boarding

8.1

Food

7.0

Crew

8.5

Entertainment

7.0

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
7.5
Good
697 reviews
Alaska Airlines
7.9
Good
13,123 reviews
Check prices

Comfort

7.8

Overall

7.9

Boarding

8.1

Food

7.0

Crew

8.5

Entertainment

7.0

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
7.0
Good
764 reviews
Alaska Airlines
7.9
Good
13,123 reviews
Check prices

Comfort

7.8

Overall

7.9

Boarding

8.1

Food

7.0

Crew

8.5

Entertainment

7.0

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
8,268 reviews
Alaska Airlines
7.9
Good
13,123 reviews
Check prices

Comfort

7.8

Overall

7.9

Boarding

8.1

Food

7.0

Crew

8.5

Entertainment

7.0

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 30m. Fly via British Airways, KLM, or Delta 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 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 (87%), KLM (84%), SAUDIA (84%).

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

    On average you can expect to pay £1,742 for a flight from London to State of Washington. The cheapest flight overall is £332 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £350.

  • 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 £481). Flying from London to State of Washington in July is currently the most expensive (average of £645). 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

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Heathrow to Newark flights
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Heathrow to San Francisco flights
Gatwick to Miami flights
Stansted to Miami flights
London City to Miami flights
Heathrow to Seattle flights
Manchester to Orlando flights
Heathrow to O'Hare Intl flights
Gatwick to Los Angeles flights
Heathrow to Hobby flights
Manchester to Newark flights
Stansted to Los Angeles flights
London City to Los Angeles flights
East Midlands to John F Kennedy Intl flights
East Midlands to Newark flights
Manchester to LaGuardia flights
Luton to Miami flights
Heathrow to Dulles Intl flights
Edinburgh to Newark flights
Heathrow to Tampa flights
Gatwick to Boston flights
Heathrow to Atlanta flights
Heathrow to George Bush Intcntl flights
Luton to Los Angeles flights
Heathrow to Ontario flights
Stansted to Orlando flights
London City to Orlando flights
Heathrow to Baltimore flights
London City to Boston flights
Edinburgh to John F Kennedy Intl flights
Heathrow to Sky Harbor Intl flights

Top 10 airlines flying from London to Washington

AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£329Average£514FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£335Average£522FlexibilityNo cancel feeOn-time76%
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United AirlinesCheapest£371Average£491FlexibilityNo cancel feeOn-time69%
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Aer LingusCheapest£392Average£648FlexibilityNo cancel feeOn-timeN/A
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DeltaCheapest£399Average£660FlexibilityNo cancel feeOn-timeN/A
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Virgin AtlanticCheapest£407Average£724FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air FranceCheapest£410Average£606FlexibilityNo cancel feeOn-time77%
Search Air France flights
Alaska AirlinesCheapest£426Average£557FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
KLMCheapest£429Average£618FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£438Average£641FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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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.

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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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