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Cheap flights from London to Washington from £329

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/10. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
14 Aug — 21 Aug1
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
Explore the most affordable flight options available from London to Washington. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 15 July 2026.

Mon 7/1211:55
LGW
-
SEA
1 stop13h 05m
Icelandair
Tue 15/1214:35
SEA
-
LGW
1 stop12h 20m
Icelandair
Deal found 15/7£448
Tue 1/909:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Fri 18/913:30
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 14/7£449
Fri 14/810:45
LHR
-
SEA
1 stop19h 20m
Delta
Sat 22/821:45
SEA
-
LHR
Nonstop9h 50m
Delta
Deal found 13/7£450
Mon 10/809:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Thu 20/813:30
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 13/7£451
Thu 13/809:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Wed 19/820:20
SEA
-
LHR
Nonstop9h 25m
British Airways
Deal found 13/7£452
Wed 9/913:05
LHR
-
SEA
1 stop12h 50m
Multiple Airlines
Tue 4/507:55
SEA
-
LHR
2 stops17h 10m
Multiple Airlines
Deal found 14/7£453
Tue 11/816:30
LHR
-
SEA
Nonstop9h 55m
British Airways
Sun 23/820:20
SEA
-
LHR
Nonstop9h 25m
British Airways
Deal found 13/7£454
Mon 19/1021:25
LHR
-
SEA
1 stop31h 15m
Icelandair
Mon 2/1114:35
SEA
-
LHR
1 stop20h 55m
Icelandair
Deal found 13/7£454
Thu 24/915:40
LGW
-
SEA
1 stop13h 00m
Icelandair
Thu 8/1019:00
SEA
-
LGW
1 stop11h 40m
Icelandair
Deal found 12/7£456
Sat 29/809:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Thu 17/913:30
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 14/7£456
Tue 1/916:30
LHR
-
SEA
Nonstop9h 55m
British Airways
Thu 17/913:30
SEA
-
LHR
Nonstop9h 15m
British Airways
Deal found 14/7£457
Thu 17/915:40
LGW
-
SEA
1 stop13h 00m
Icelandair
Sat 3/1015:40
SEA
-
LGW
1 stop14h 55m
Icelandair
Deal found 14/7£457

Find flight deals from London to Washington

Keep the following information in mind while searching for London to Washington flight deals. Data was last updated 15 July 2026.

Round-trip from

£448

One-way from

£329

Popular in

December

Cheapest in

February

Average price

£629

Good round-trip deal

£501 or less

Good one-way deal

£419 or less
Icelandair
  • Icelandair
  • 7/12-15/12
  • 2 total stops
  • 25h 25m total
  • London to Washington
Search Deals
6/10
  • 6/10
  • 3 total stops
  • 59h 39m total
  • London to Washington
Search Deals
High demand for flights, 0% potential price rise
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 July 2026
Search Deals
Price to beat on a round-trip flight from London (LON) to Washington.
Search Deals
Price to beat on a one-way flight from London (LON) to Washington.
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from London to Washington that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 15 July 2026.
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 - SEA

LHRSEA

London Heathrow

Wed 14/10

13:05-17:55

1 stop12h 50m

Seattle/Tacoma Intl

Sun 18/10

15:40-11:55

1 stop12h 15m

£479

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 16/10

09:00-16:59

1 stop15h 59m

Seattle/Tacoma Intl

Mon 19/10

12:16-12:25

2 stops16h 09m

£531

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 14/12

09:30-20:10

2 stops18h 40m

Seattle/Tacoma Intl

Sat 26/12

22:45-11:05

1 stop28h 20m

£535

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 19/12

12:20-14:45

Nonstop10h 25m

Seattle/Tacoma Intl

Fri 1/1

16:45-10:30

Nonstop9h 45m

£541

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 27/10

14:55-17:50

Nonstop9h 55m

Seattle/Tacoma Intl

Sun 8/11

18:45-12:10

Nonstop9h 25m

£555

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 1/11

12:20-14:45

Nonstop10h 25m

Seattle/Tacoma Intl

Thu 19/11

08:25-07:05

1 stop14h 40m

£559

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 28/8

10:25-18:41

1 stop16h 16m

Seattle/Tacoma Intl

Fri 4/9

22:58-20:40

1 stop13h 42m

£560

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 24/8

06:55-17:42

2 stops18h 47m

Seattle/Tacoma Intl

Mon 31/8

05:00-06:45

2 stops17h 45m

£562

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 4/9

07:05-13:45

2 stops14h 40m

Seattle/Tacoma Intl

Sat 19/9

15:55-18:50

2 stops18h 55m

£567

LondonSeattle

STN - SEA

STNSEA

London Stansted

Fri 4/9

18:25-21:00

3 stops34h 35m

Seattle/Tacoma Intl

Sat 19/9

15:40-23:05

2 stops23h 25m

£570

Flights are sorted by cheapest return flights first.

Deals found on 13/7

Showing 1-10 of 60 resultsSorted by cheapest first
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6

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
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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, October is the cheapest month in which you can book a flight from London to State of Washington (average of £268). Flying from London to State of Washington in December is currently the most expensive (average of £1,120). 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?

Find hourly flight availability from London to Washington. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 15 July 2026.

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

Explore weekly flight availability from London to Washington. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 15 July 2026.

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 (18 on average).

How much does it cost for a return flight from London to State of Washington?

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

Get insights into the airlines that provide service to Washington. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Washington. Reviews last updated 15 July 2026.
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
12,657 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
12,657 reviews
Alaska Airlines
7.9
Good
12,657 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
1,539 reviews
Alaska Airlines
7.9
Good
12,657 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
693 reviews
Alaska Airlines
7.9
Good
12,657 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
7.0
Good
708 reviews
Alaska Airlines
7.9
Good
12,657 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

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
8,115 reviews
Alaska Airlines
7.9
Good
12,657 reviews
Check prices

Boarding

8.1

Overall

7.9

Entertainment

7.0

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

Find useful and relevant information for your journey from London to Washington. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • 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 25m. Fly via Icelandair, United Airlines, 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 cheapest airlines to fly from London to State of Washington one-way?

    To fly one-way, consider booking your trip with Icelandair, which is currently one of the cheapest options available, starting at £354. British Airways flights start at £365 while deals on KLM start at £393 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 (88%), KLM (84%), Air France (84%).

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

    On average you can expect to pay £1,428 for a flight from London to State of Washington. The cheapest flight overall is £345 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £431.

  • 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, October is the cheapest month in which you can book a flight from London to State of Washington (average of £268). Flying from London to State of Washington in December is currently the most expensive (average of £1,120). 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

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Alternative routes for London to Washington

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from London to Washington

Discover the top 10 airlines that operate flights from London to Washington. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 15 July 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£335Average£528FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£342Average£504FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£392Average£619FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Virgin AtlanticCheapest£425Average£755FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
United AirlinesCheapest£432Average£642FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£438Average£616FlexibilityNo cancel feeOn-time75%
Search KLM flights
DeltaCheapest£442Average£640FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£452Average£639FlexibilityNo cancel feeOn-time77%
Search Air France flights
British AirwaysCheapest£459Average£641FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£476Average£677FlexibilityNo cancel feeOn-time76%
Search Finnair flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

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.

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

Cheapflights simply makes it quick and affordable to book flights from London to Washington by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

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.

Can Cheapflights notify me if prices for flights from London to Washington become cheaper?

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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