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Cheap flights from London to Washington from £386

LON — SEA
19 Nov — 26 Nov1
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 29/1008:55 -
1 stop12h 55m
Tue 17/1111:45 -
1 stop14h 45m
Deal found 19/10£407
Thu 12/1108:55 -
1 stop12h 55m
Sun 22/1116:50 -
Nonstop9h 50m
Deal found 16/10£408
Sun 15/1106:30 -
1 stop13h 30m
Sun 22/1108:40 -
2 stops16h 40m
Deal found 18/10£408
Thu 29/1014:30 -
1 stop14h 27m
Wed 11/1108:40 -
1 stop19h 10m
Deal found 17/10£409
Mon 23/1110:00 -
1 stop13h 14m
Mon 7/1215:25 -
1 stop16h 20m
Deal found 18/10£410
Thu 22/1006:15 -
1 stop13h 00m
Thu 22/413:45 -
1 stop15h 20m
Deal found 15/10£411
Mon 16/1112:20 -
Nonstop10h 30m
Thu 26/1116:50 -
Nonstop9h 50m
Deal found 15/10£411
Thu 19/1112:20 -
Nonstop10h 30m
Thu 3/1216:50 -
Nonstop9h 50m
Deal found 19/10£412
Fri 27/1112:20 -
Nonstop10h 30m
Sun 6/1207:38 -
1 stop15h 12m
Deal found 19/10£413
Fri 4/1210:00 -
1 stop13h 13m
Fri 28/518:35 -
1 stop13h 25m
Deal found 19/10£414
Thu 29/1012:20 -
Nonstop10h 34m
Wed 11/1116:50 -
Nonstop9h 50m
Deal found 16/10£414
Mon 16/1118:40 -
2 stops36h 27m
Thu 26/1110:50 -
2 stops61h 00m
Deal found 15/10£414

Find flight deals from London to Washington

Round-trip from

£407

One-way from

£386

Popular in

August

Cheapest in

February

Average price

£541

Good round-trip deal

£426 or less

Good one-way deal

£386 or less
KLM
  • KLM
  • 29/10-17/11
  • 2 total stops
  • 27h 40m total
  • London to Washington
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Delta
  • Delta
  • 14/12-31/12
  • Nonstop
  • 10h 30m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (£34 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 14/12

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£386

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sat 12/12

14:45-17:00

Nonstop10h 15m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£387

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 15/12

14:45-17:00

Nonstop10h 15m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£387

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Sat 16/1

16:45-15:13

1 stop30h 28m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£393

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 22/3

12:20-15:39

Nonstop10h 19m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£398

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 1/2

06:30-11:47

1 stop13h 17m

Seattle/Tacoma Intl

Sun 14/2

14:00-11:40

1 stop13h 40m

£408

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Thu 19/11

06:30-11:47

1 stop13h 17m

Seattle/Tacoma Intl

Tue 1/12

16:05-13:45

1 stop13h 40m

£409

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Fri 6/11

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Sun 22/11

16:50-10:40

Nonstop9h 50m

£411

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Fri 11/12

09:00-23:44

2 stops22h 44m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£414

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 16/3

09:10-00:49

2 stops22h 39m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£416

Flights are sorted by cheapest return flights first.

Deals found on 15/10

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 £488). Flying from London to State of Washington in July is currently the most expensive (average of £649). 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 £443 and £586 in October.
The cheapest return price found within the last 5 days was £407 on Multiple Airlines (29 Oct–17 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 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
13,093 reviews
Check prices

Entertainment

7.0

Boarding

8.1

Overall

7.9

Crew

8.5

Comfort

7.8

Food

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
13,093 reviews
Alaska Airlines
7.9
Good
13,093 reviews
Check prices

Entertainment

7.0

Boarding

8.1

Overall

7.9

Crew

8.5

Comfort

7.8

Food

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
1,591 reviews
Alaska Airlines
7.9
Good
13,093 reviews
Check prices

Entertainment

7.0

Boarding

8.1

Overall

7.9

Crew

8.5

Comfort

7.8

Food

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
696 reviews
Alaska Airlines
7.9
Good
13,093 reviews
Check prices

Entertainment

7.0

Boarding

8.1

Overall

7.9

Crew

8.5

Comfort

7.8

Food

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
6.9
Okay
763 reviews
Alaska Airlines
7.9
Good
13,093 reviews
Check prices

Entertainment

7.0

Boarding

8.1

Overall

7.9

Crew

8.5

Comfort

7.8

Food

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
8,266 reviews
Alaska Airlines
7.9
Good
13,093 reviews
Check prices

Entertainment

7.0

Boarding

8.1

Overall

7.9

Crew

8.5

Comfort

7.8

Food

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 13h 17m. Fly via KLM, Delta, or Virgin Atlantic 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 £1,751 for a flight from London to State of Washington. The cheapest flight overall is £334 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £377.

  • 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 £488). Flying from London to State of Washington in July is currently the most expensive (average of £649). 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 O'Hare Intl flights
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London City to Miami flights
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Heathrow to Hobby flights
Stansted to Los Angeles flights
Manchester to Orlando flights
London City to Orlando flights
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London City to Los Angeles flights
Stansted to Orlando flights
Heathrow to Dulles Intl flights
Manchester to LaGuardia flights
Heathrow to Seattle flights
Heathrow to Tampa flights
Edinburgh to Newark flights
Heathrow to Atlanta flights
Heathrow to Baltimore flights
Gatwick to Boston flights
Heathrow to George Bush Intcntl flights
Luton to Los Angeles flights
London City to Boston flights
Gatwick to Dallas/Fort Worth flights
Stansted to Boston flights
Edinburgh to John F Kennedy Intl flights
Gatwick to Fort Lauderdale flights
Gatwick to O'Hare Intl flights

Top 10 airlines flying from London to Washington

AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£330Average£516FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£337Average£525FlexibilityNo cancel feeOn-time76%
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United AirlinesCheapest£373Average£493FlexibilityNo cancel feeOn-time69%
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Aer LingusCheapest£394Average£651FlexibilityNo cancel feeOn-timeN/A
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DeltaCheapest£401Average£663FlexibilityNo cancel feeOn-timeN/A
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Virgin AtlanticCheapest£409Average£727FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air FranceCheapest£412Average£609FlexibilityNo cancel feeOn-time77%
Search Air France flights
Alaska AirlinesCheapest£428Average£560FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
KLMCheapest£431Average£621FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£441Average£644FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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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.

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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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