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Cheap flights from London to Washington from £378

LON — SEA
15 Oct — 22 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

Tue 3/1112:20 -
Nonstop10h 30m
Tue 17/1116:50 -
Nonstop9h 50m
Deal found 15/9£429
Sun 1/1112:20 -
Nonstop10h 30m
Mon 7/1209:40 -
1 stop13h 10m
Deal found 15/9£430
Fri 9/1015:40 -
1 stop13h 00m
Mon 26/1015:35 -
1 stop12h 20m
Deal found 14/9£430
Thu 17/1214:45 -
Nonstop10h 05m
Mon 4/118:55 -
Nonstop9h 25m
Deal found 14/9£430
Thu 24/910:25 -
1 stop15h 23m
Sat 10/1018:40 -
1 stop13h 20m
Deal found 15/9£431
Mon 12/1009:20 -
1 stop15h 15m
Sun 18/1013:45 -
1 stop11h 45m
Deal found 14/9£431
Sun 1/1113:25 -
2 stops16h 32m
Thu 19/1108:40 -
1 stop19h 10m
Deal found 15/9£431
Wed 23/1211:30 -
1 stop34h 25m
Thu 7/116:55 -
Nonstop9h 45m
Deal found 14/9£432
Thu 24/910:25 -
1 stop15h 23m
Sat 3/1013:30 -
1 stop11h 50m
Deal found 14/9£433
Sat 26/914:05 -
2 stops16h 42m
Thu 22/1010:50 -
1 stop18h 30m
Deal found 12/9£433
Fri 25/915:05 -
1 stop31h 12m
Wed 30/905:50 -
2 stops16h 40m
Deal found 15/9£433
Thu 1/1010:00 -
1 stop14h 35m
Fri 16/1013:45 -
1 stop11h 45m
Deal found 15/9£434

Find flight deals from London to Washington

Round-trip from

£427

One-way from

£378

Popular in

August

Cheapest in

February

Average price

£547

Good round-trip deal

£476 or less

Good one-way deal

£559 or less
Icelandair
  • Icelandair
  • 15/10-24/10
  • 2 total stops
  • 24h 30m total
  • London to Washington
Search Deals
Lufthansa
  • Lufthansa
  • 17/2-31/12
  • 1 total stop
  • 14h 25m 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

Fri 13/11

06:30-15:25

2 stops16h 55m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£379

LondonSeattle

LTN London Luton - SEA Seattle/Tacoma Intl

LTNSEA

London Luton

Mon 19/10

13:00-18:45

3 stops37h 45m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£379

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Wed 28/10

16:15-09:45

3 stops48h 30m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£380

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 9/3

09:00-20:48

2 stops19h 48m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£384

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Fri 6/11

10:00-23:04

2 stops21h 04m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£384

LondonSeattle

LCY London City - SEA Seattle/Tacoma Intl

LCYSEA

London City

Wed 4/11

09:15-23:07

2 stops21h 52m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£386

LondonSeattle

LCY London City - SEA Seattle/Tacoma Intl

LCYSEA

London City

Mon 16/11

19:05-23:07

2 stops36h 02m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£386

LondonSeattle

LCY London City - SEA Seattle/Tacoma Intl

LCYSEA

London City

Mon 2/11

09:15-20:47

2 stops19h 32m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£386

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sun 14/3

06:30-05:43

2 stops31h 13m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£387

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sat 13/3

08:40-08:45

2 stops32h 05m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£387

Flights are sorted by cheapest return flights first.

Deals found on 14/9

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 £489). Flying from London to State of Washington in December 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.

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 (17 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 £477 and £640 in October.
The cheapest return price found within the last 5 days was £427 on Icelandair (15 Oct–24 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
12,931 reviews
Check prices

Boarding

8.1

Food

7.0

Crew

8.5

Entertainment

7.0

Overall

7.9

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
12,931 reviews
Alaska Airlines
7.9
Good
12,931 reviews
Check prices

Boarding

8.1

Food

7.0

Crew

8.5

Entertainment

7.0

Overall

7.9

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
1,580 reviews
Alaska Airlines
7.9
Good
12,931 reviews
Check prices

Boarding

8.1

Food

7.0

Crew

8.5

Entertainment

7.0

Overall

7.9

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
694 reviews
Alaska Airlines
7.9
Good
12,931 reviews
Check prices

Boarding

8.1

Food

7.0

Crew

8.5

Entertainment

7.0

Overall

7.9

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
743 reviews
Alaska Airlines
7.9
Good
12,931 reviews
Check prices

Boarding

8.1

Food

7.0

Crew

8.5

Entertainment

7.0

Overall

7.9

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
8,220 reviews
Alaska Airlines
7.9
Good
12,931 reviews
Check prices

Boarding

8.1

Food

7.0

Crew

8.5

Entertainment

7.0

Overall

7.9

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 10h 20m. Fly via Delta, Virgin Atlantic, or KLM 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 £333. Icelandair flights start at £337 while deals on Virgin Atlantic start at £364 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: SAUDIA (79%), Scandinavian Airlines (78%), KLM (75%).

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

    On average you can expect to pay £1,820 for a flight from London to State of Washington. The cheapest flight overall is £315 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £319.

  • 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 £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

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

Top 10 airlines flying from London to Washington

AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£333Average£511FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£334Average£511FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
United AirlinesCheapest£368Average£486FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£389Average£635FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
DeltaCheapest£396Average£646FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Virgin AtlanticCheapest£414Average£799FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air FranceCheapest£426Average£609FlexibilityNo cancel feeOn-time77%
Search Air France flights
KLMCheapest£430Average£610FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£448Average£628FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Alaska AirlinesCheapest£452Average£563FlexibilityNo 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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