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Cheap flights from London to Washington from £274

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
3 Aug — 10 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 4 July 2026.

Tue 1/913:00
LGW
-
SEA
1 stop12h 55m
Icelandair
Sat 31/1015:35
SEA
-
LGW
1 stop12h 20m
Icelandair
Deal found 3/7£448
Fri 9/1013:05
LHR
-
SEA
1 stop12h 50m
Icelandair
Fri 16/1015:40
SEA
-
LHR
1 stop12h 15m
Icelandair
Deal found 29/6£448
Tue 8/913:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Wed 30/915:40
SEA
-
LHR
1 stop20h 40m
Icelandair
Deal found 29/6£449
Wed 7/1015:40
LGW
-
SEA
1 stop34h 15m
Icelandair
Sat 7/1114:35
SEA
-
LGW
1 stop12h 20m
Icelandair
Deal found 1/7£451
Wed 26/809:50
LHR
-
SEA
Nonstop9h 45m
British Airways
Wed 9/920:20
SEA
-
LHR
Nonstop9h 25m
British Airways
Deal found 30/6£451
Sun 1/1111:55
LGW
-
SEA
1 stop13h 05m
Icelandair
Sat 20/315:35
SEA
-
LGW
1 stop15h 05m
Icelandair
Deal found 1/7£451
Sun 4/1013:05
LHR
-
SEA
1 stop15h 35m
Icelandair
Fri 9/1019:00
SEA
-
LHR
1 stop17h 20m
Icelandair
Deal found 30/6£451
Wed 7/1015:40
LGW
-
SEA
1 stop34h 15m
Icelandair
Fri 23/1015:40
SEA
-
LGW
1 stop15h 00m
Icelandair
Deal found 1/7£453
Sat 29/815:40
LGW
-
SEA
1 stop28h 05m
Icelandair
Sun 6/919:00
SEA
-
LGW
1 stop11h 40m
Icelandair
Deal found 30/6£454
Thu 17/915:40
LGW
-
SEA
1 stop13h 00m
Icelandair
Wed 30/915:40
SEA
-
LGW
1 stop15h 00m
Icelandair
Deal found 3/7£454
Thu 20/815:40
LGW
-
SEA
1 stop28h 05m
Icelandair
Sat 5/915:40
SEA
-
LGW
1 stop12h 05m
Icelandair
Deal found 1/7£455
Wed 2/915:40
LGW
-
SEA
1 stop13h 00m
Icelandair
Tue 8/919:00
SEA
-
LGW
1 stop11h 40m
Icelandair
Deal found 1/7£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 4 July 2026.

Round-trip from

£448

One-way from

£274

Popular in

July

Cheapest in

February

Average price

£645

Good round-trip deal

£537 or less

Good one-way deal

£525 or less
Icelandair
  • Icelandair
  • 1/9-31/10
  • 2 total stops
  • 25h 15m total
  • London to Washington
Search Deals
9/9
  • 9/9
  • 3 total stops
  • 54h 20m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£47 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£7 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 4 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

LGW - SEA

LGWSEA

London Gatwick

Thu 17/9

15:40-20:40

1 stop13h 00m

Seattle/Tacoma Intl

Wed 30/9

15:40-14:40

1 stop15h 00m

£454

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Wed 14/10

10:25-17:47

1 stop15h 22m

Seattle/Tacoma Intl

Mon 26/10

15:00-15:45

1 stop17h 45m

£540

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 19/9

06:55-16:59

1 stop18h 04m

Seattle/Tacoma Intl

Sat 26/9

10:55-11:55

2 stops17h 00m

£543

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Wed 2/9

09:00-16:59

1 stop15h 59m

Seattle/Tacoma Intl

Tue 8/9

07:00-06:55

2 stops15h 55m

£543

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 4/9

07:25-18:29

2 stops19h 04m

Seattle/Tacoma Intl

Sun 6/9

07:00-06:55

2 stops15h 55m

£546

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 10/11

09:25-11:30

Nonstop10h 05m

Seattle/Tacoma Intl

Tue 17/11

10:35-10:00

1 stop15h 25m

£549

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 29/8

13:10-20:52

1 stop15h 42m

Seattle/Tacoma Intl

Sun 6/9

13:30-06:45

Nonstop9h 15m

£555

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 17/9

08:55-16:42

1 stop15h 47m

Seattle/Tacoma Intl

Wed 30/9

13:40-10:50

1 stop13h 10m

£559

LondonSeattle

LGW - SEA

LGWSEA

London Gatwick

Sat 19/9

10:25-23:20

2 stops20h 55m

Seattle/Tacoma Intl

Thu 1/10

12:36-16:00

2 stops19h 24m

£561

LondonSeattle

LCY - SEA

LCYSEA

London City

Thu 24/9

10:00-16:35

1 stop14h 35m

Seattle/Tacoma Intl

Sun 4/10

13:45-09:30

1 stop11h 45m

£563

Flights are sorted by cheapest return flights first.

Deals found on 4/7

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 £269). Flying from London to State of Washington in December is currently the most expensive (average of £1,124). 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 4 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 4 July 2026.

The most flights from LON to USWA are scheduled on a Tuesday (22 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?

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 4 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
12,618 reviews
Check prices

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

7.9

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
12,618 reviews
Alaska Airlines
7.9
Good
12,618 reviews
Check prices

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

7.9

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
1,533 reviews
Alaska Airlines
7.9
Good
12,618 reviews
Check prices

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

7.9

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
691 reviews
Alaska Airlines
7.9
Good
12,618 reviews
Check prices

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

7.9

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
699 reviews
Alaska Airlines
7.9
Good
12,618 reviews
Check prices

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

7.9

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
8,095 reviews
Alaska Airlines
7.9
Good
12,618 reviews
Check prices

Boarding

8.1

Comfort

7.8

Food

7.1

Overall

7.9

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

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 13h. Fly via Icelandair, Delta, or United Airlines to get the fastest option. The distance between London and State of Washington is about 4807 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 (88%), KLM (84%), Air France (84%).

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

    On average you can expect to pay £1,816 for a flight from London to State of Washington. The cheapest flight overall is £370 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £486.

  • 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 £269). Flying from London to State of Washington in December is currently the most expensive (average of £1,124). 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 4 July 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£336Average£530FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IcelandairCheapest£342Average£507FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Aer LingusCheapest£393Average£620FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
Virgin AtlanticCheapest£430Average£757FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£439Average£620FlexibilityNo cancel feeOn-time75%
Search KLM flights
DeltaCheapest£443Average£631FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£452Average£646FlexibilityNo cancel feeOn-time77%
Search Air France flights
British AirwaysCheapest£461Average£641FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£469Average£591FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£476Average£678FlexibilityNo 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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