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Cheap flights from London to Washington from £380

LON — SEA
20 Sep — 27 Sep1
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

Mon 24/821:25 -
1 stop22h 20m
Tue 23/214:35 -
1 stop12h 15m
Deal found 16/8£462
Tue 17/1120:35 -
1 stop28h 25m
Tue 8/1214:35 -
1 stop12h 15m
Deal found 16/8£467
Wed 11/1111:55 -
1 stop13h 05m
Tue 17/1114:35 -
1 stop12h 20m
Deal found 17/8£467
Wed 11/1112:15 -
1 stop12h 45m
Tue 17/1114:35 -
1 stop20h 55m
Deal found 17/8£467
Mon 24/815:40 -
1 stop34h 15m
Mon 7/915:40 -
1 stop15h 00m
Deal found 17/8£469
Mon 24/821:25 -
1 stop22h 20m
Mon 7/915:40 -
1 stop12h 15m
Deal found 17/8£469
Tue 29/915:40 -
1 stop13h 00m
Wed 7/1015:40 -
1 stop15h 00m
Deal found 16/8£471
Tue 25/821:25 -
1 stop22h 20m
Tue 8/919:00 -
1 stop17h 20m
Deal found 16/8£472
Thu 8/1021:25 -
1 stop28h 30m
Wed 21/1015:40 -
1 stop12h 15m
Deal found 17/8£473
Sun 13/1220:35 -
1 stop28h 25m
Mon 28/1214:35 -
1 stop20h 55m
Deal found 16/8£475
Tue 1/915:40 -
1 stop13h 00m
Wed 9/919:00 -
1 stop11h 40m
Deal found 16/8£476
Tue 1/913:00 -
1 stop15h 40m
Tue 8/919:00 -
1 stop11h 40m
Deal found 17/8£476

Find flight deals from London to Washington

Round-trip from

£467

One-way from

£380

Popular in

August

Cheapest in

February

Average price

£627

Good round-trip deal

£573 or less

Good one-way deal

£563 or less
Icelandair
  • Icelandair
  • 17/11-8/12
  • 2 total stops
  • 40h 40m total
  • London to Washington
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SWISS
  • SWISS
  • 15/2
  • 2 total stops
  • 22h 21m 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

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Sun 18/10

15:40-17:55

1 stop34h 15m

Seattle/Tacoma Intl

Wed 28/10

15:35-10:55

1 stop12h 20m

£502

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 15/9

16:15-20:43

1 stop36h 28m

Seattle/Tacoma Intl

Wed 16/9

23:00-06:30

2 stops23h 30m

£511

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Thu 1/10

06:30-12:20

1 stop13h 50m

Seattle/Tacoma Intl

Sun 11/10

15:00-13:20

1 stop14h 20m

£526

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sun 20/9

06:50-18:41

2 stops19h 51m

Seattle/Tacoma Intl

Tue 20/10

12:00-11:35

1 stop15h 35m

£532

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sun 20/9

06:50-16:10

2 stops17h 20m

Seattle/Tacoma Intl

Sun 27/9

09:05-10:10

2 stops17h 05m

£533

LondonSeattle

LTN London Luton - SEA Seattle/Tacoma Intl

LTNSEA

London Luton

Fri 2/10

12:50-13:45

3 stops32h 55m

Seattle/Tacoma Intl

Fri 9/10

15:55-00:30

3 stops24h 35m

£534

LondonSeattle

LCY London City - SEA Seattle/Tacoma Intl

LCYSEA

London City

Mon 2/11

19:05-23:17

2 stops36h 12m

Seattle/Tacoma Intl

Wed 2/12

13:16-17:05

2 stops19h 49m

£541

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 7/12

14:55-16:50

Nonstop9h 55m

Seattle/Tacoma Intl

Mon 14/12

12:47-12:00

1 stop15h 13m

£550

LondonSeattle

LTN London Luton - SEA Seattle/Tacoma Intl

LTNSEA

London Luton

Fri 18/9

06:20-08:30

2 stops34h 10m

Seattle/Tacoma Intl

Fri 25/9

19:10-17:25

1 stop14h 15m

£550

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sat 26/12

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Tue 5/1

16:55-10:40

Nonstop9h 45m

£556

Flights are sorted by cheapest return flights first.

Deals found on 16/8

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 £487). Flying from London to State of Washington in December is currently the most expensive (average of £648). 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 Wednesday (24 on average). You will have fewer flight options on Monday, 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 £503 and £665 in November.
The cheapest return price found within the last 5 days was £467 on Icelandair (17 Nov–8 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 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
12,833 reviews
Check prices

Comfort

7.8

Boarding

8.1

Food

7.0

Overall

7.9

Entertainment

7.0

Crew

8.5

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
12,833 reviews
Alaska Airlines
7.9
Good
12,833 reviews
Check prices

Comfort

7.8

Boarding

8.1

Food

7.0

Overall

7.9

Entertainment

7.0

Crew

8.5

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
1,564 reviews
Alaska Airlines
7.9
Good
12,833 reviews
Check prices

Comfort

7.8

Boarding

8.1

Food

7.0

Overall

7.9

Entertainment

7.0

Crew

8.5

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
12,833 reviews
Check prices

Comfort

7.8

Boarding

8.1

Food

7.0

Overall

7.9

Entertainment

7.0

Crew

8.5

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
732 reviews
Alaska Airlines
7.9
Good
12,833 reviews
Check prices

Comfort

7.8

Boarding

8.1

Food

7.0

Overall

7.9

Entertainment

7.0

Crew

8.5

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
8,183 reviews
Alaska Airlines
7.9
Good
12,833 reviews
Check prices

Comfort

7.8

Boarding

8.1

Food

7.0

Overall

7.9

Entertainment

7.0

Crew

8.5

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 50m. Fly via Icelandair, United Airlines, 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 Stansted - Seattle/Tacoma Intl or London Gatwick - 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 £1,210 for a flight from London to State of Washington. The cheapest flight overall is £321 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £434.

  • 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 £487). Flying from London to State of Washington in December is currently the most expensive (average of £648). 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
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Heathrow to Dallas/Fort Worth flights
Heathrow to O'Hare Intl flights
Gatwick to Orlando flights
Gatwick to Los Angeles flights
Heathrow to Dulles Intl flights
Stansted to Orlando flights
Gatwick to Miami flights
Manchester to Newark flights
London City to Los Angeles flights
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London City to Miami flights
Stansted to Miami flights
London City to Orlando flights
Heathrow to Tampa flights
Heathrow to Baltimore flights
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Manchester to LaGuardia flights
Gatwick to Las Vegas flights
Edinburgh to Newark flights
Heathrow to Ontario flights
Gatwick to Boston flights
Heathrow to George Bush Intcntl flights
Luton to Miami flights
London City to Las Vegas flights
Edinburgh to John F Kennedy Intl flights
London City to Boston flights
Stansted to Las Vegas flights
Heathrow to Austin flights

Top 10 airlines flying from London to Washington

AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£329Average£417FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£336Average£497FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£385Average£624FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£411Average£482FlexibilityNo cancel feeOn-time69%
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Virgin AtlanticCheapest£417Average£766FlexibilityNo cancel feeOn-time72%
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KLMCheapest£427Average£603FlexibilityNo cancel feeOn-time75%
Search KLM flights
DeltaCheapest£434Average£640FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£443Average£615FlexibilityNo cancel feeOn-time77%
Search Air France flights
British AirwaysCheapest£447Average£624FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£454Average£666FlexibilityNo cancel feeOn-time76%
Search Finnair 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.

Why should you use Cheapflights to find cheap flight tickets from London to Washington?

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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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