Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from London to Washington from £391

LON — SEA
29 Oct — 5 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

Mon 5/1012:25 -
1 stop16h 11m
Mon 19/1015:00 -
1 stop32h 10m
Deal found 28/9£415
Mon 5/1006:30 -
1 stop18h 05m
Mon 19/1021:50 -
Nonstop9h 45m
Deal found 28/9£416
Tue 8/1206:30 -
1 stop13h 20m
Thu 14/116:55 -
Nonstop9h 45m
Deal found 28/9£416
Thu 22/1011:45 -
1 stop12h 50m
Wed 28/1017:45 -
Nonstop9h 55m
Deal found 28/9£417
Sun 4/1006:00 -
2 stops24h 47m
Sat 17/1015:00 -
1 stop14h 20m
Deal found 27/9£418
Sun 4/1018:30 -
Nonstop10h 25m
Sat 17/1023:10 -
1 stop23h 35m
Deal found 27/9£419
Sat 7/1106:30 -
1 stop13h 17m
Mon 8/309:00 -
1 stop17h 00m
Deal found 28/9£420
Wed 14/1010:25 -
2 stops20h 39m
Wed 11/1115:25 -
1 stop16h 20m
Deal found 27/9£420
Mon 7/1206:30 -
1 stop13h 20m
Sat 16/116:55 -
Nonstop9h 45m
Deal found 24/9£420
Mon 7/1206:20 -
1 stop16h 53m
Sun 17/116:55 -
Nonstop9h 45m
Deal found 28/9£421
Wed 14/1010:25 -
2 stops20h 39m
Wed 4/1115:25 -
1 stop33h 35m
Deal found 26/9£422
Wed 16/1208:40 -
2 stops22h 15m
Sun 10/106:05 -
1 stop17h 00m
Deal found 24/9£422

Find flight deals from London to Washington

Round-trip from

£415

One-way from

£391

Popular in

August

Cheapest in

February

Average price

£559

Good round-trip deal

£435 or less

Good one-way deal

£502 or less
Lufthansa
  • Lufthansa
  • 5/2-9/2
  • 2 total stops
  • 31h 00m total
  • London to Washington
Search Deals
Virgin Atlantic
  • Virgin Atlantic
  • 7/1-31/12
  • 2 total stops
  • 25h 50m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£29 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 September 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

 
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

Thu 26/11

09:50-17:10

1 stop15h 20m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£392

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Thu 26/11

19:30-22:31

2 stops35h 01m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£392
Fastest return journey

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Fri 8/1

14:45-16:40

Nonstop9h 55m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£394

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Thu 7/1

12:20-14:45

Nonstop10h 25m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£398

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 24/3

12:20-15:39

Nonstop10h 19m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£400

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sat 20/3

10:45-18:30

1 stop14h 45m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£403

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 5/1

10:10-22:02

1 stop19h 52m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£407

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Fri 4/12

09:00-23:44

2 stops22h 44m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£416

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 15/12

09:30-12:00

1 stop34h 30m

Seattle/Tacoma Intl

Fri 8/1

08:30-09:10

2 stops16h 40m

£422

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sun 8/11

06:50-20:56

2 stops22h 06m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£425

Flights are sorted by cheapest return flights first.

Deals found on 27/9

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
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

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 £498). Flying from London to State of Washington in July is currently the most expensive (average of £650). 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 Tuesday (24 on average). You will have fewer flight options on Thursday, 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 £478 and £612 in February.
The cheapest return price found within the last 5 days was £415 on Multiple Airlines (5 Feb–8 Feb).

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 73 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
12,986 reviews
Check prices

Entertainment

7.0

Crew

8.5

Comfort

7.8

Overall

7.9

Boarding

8.1

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
12,986 reviews
Alaska Airlines
7.9
Good
12,986 reviews
Check prices

Entertainment

7.0

Crew

8.5

Comfort

7.8

Overall

7.9

Boarding

8.1

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
1,577 reviews
Alaska Airlines
7.9
Good
12,986 reviews
Check prices

Entertainment

7.0

Crew

8.5

Comfort

7.8

Overall

7.9

Boarding

8.1

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
7.4
Good
694 reviews
Alaska Airlines
7.9
Good
12,986 reviews
Check prices

Entertainment

7.0

Crew

8.5

Comfort

7.8

Overall

7.9

Boarding

8.1

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
755 reviews
Alaska Airlines
7.9
Good
12,986 reviews
Check prices

Entertainment

7.0

Crew

8.5

Comfort

7.8

Overall

7.9

Boarding

8.1

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
8,239 reviews
Alaska Airlines
7.9
Good
12,986 reviews
Check prices

Entertainment

7.0

Crew

8.5

Comfort

7.8

Overall

7.9

Boarding

8.1

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 10h 30m. Fly via United Airlines, Delta, 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 £339. Icelandair flights start at £343 while deals on KLM start at £351 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 (82%), KLM (81%), SAUDIA (81%).

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

    On average you can expect to pay £1,843 for a flight from London to State of Washington. The cheapest flight overall is £361 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £333.

  • 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 £498). Flying from London to State of Washington in July is currently the most expensive (average of £650). 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
Heathrow to LaGuardia flights
Gatwick to John F Kennedy Intl flights
Stansted to John F Kennedy Intl flights
London City to John F Kennedy Intl flights
Gatwick to Newark flights
Luton to John F Kennedy Intl flights
Gatwick to LaGuardia flights
Heathrow to Orlando flights
Heathrow to Miami flights
Heathrow to Los Angeles flights
London City to Newark flights
Manchester to John F Kennedy Intl flights
Stansted to Newark flights
Heathrow to Dallas/Fort Worth flights
Heathrow to Boston flights
Luton to Newark flights
Gatwick to Orlando flights
Heathrow to San Francisco flights
Heathrow to Las Vegas flights
Manchester to Orlando flights
Heathrow to O'Hare Intl flights
Gatwick to Miami flights
Manchester to Newark flights
Stansted to Miami flights
Heathrow to Dulles Intl flights
Heathrow to Hobby flights
Stansted to Orlando flights
London City to Miami flights
London City to Orlando flights
Manchester to LaGuardia flights
Heathrow to Baltimore flights
Luton to Miami flights
Gatwick to Boston flights
Heathrow to Atlanta flights
Heathrow to Tampa flights
Heathrow to George Bush Intcntl flights
Gatwick to Los Angeles flights
London City to Boston flights
Edinburgh to Newark flights
Heathrow to Seattle flights
Stansted to Los Angeles flights
Stansted to Boston flights
Gatwick to Dallas/Fort Worth flights
London City to Los Angeles flights
Gatwick to Fort Lauderdale flights
Gatwick to San Francisco flights
Gatwick to Las Vegas flights
Luton to Orlando flights

Top 10 airlines flying from London to Washington

AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£338Average£520FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£339Average£527FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£375Average£495FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£396Average£651FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
DeltaCheapest£403Average£658FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air FranceCheapest£414Average£616FlexibilityNo cancel feeOn-time77%
Search Air France flights
Virgin AtlanticCheapest£418Average£815FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
KLMCheapest£436Average£625FlexibilityNo cancel feeOn-time75%
Search KLM flights
Alaska AirlinesCheapest£437Average£565FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
British AirwaysCheapest£447Average£643FlexibilityNo cancel feeOn-time70%
Search British Airways flights

Fly with Cheapflights

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.