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Cheap flights from London to Washington from £391

LON — SEA
3 Nov — 10 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

Wed 7/1010:50 -
2 stops19h 57m
Wed 14/1007:55 -
2 stops18h 05m
Deal found 30/9£414
Thu 8/1013:05 -
1 stop15h 35m
Wed 21/1019:00 -
1 stop32h 55m
Deal found 30/9£415
Thu 8/1006:15 -
1 stop13h 00m
Thu 15/1017:30 -
Nonstop9h 50m
Deal found 30/9£416
Fri 9/1009:55 -
1 stop14h 40m
Sun 11/1023:59 -
1 stop23h 16m
Deal found 30/9£417
Tue 8/1206:30 -
1 stop13h 20m
Mon 18/116:55 -
Nonstop9h 45m
Deal found 30/9£418
Thu 8/1006:00 -
2 stops20h 32m
Wed 21/1015:00 -
1 stop14h 20m
Deal found 29/9£418
Tue 13/1015:40 -
1 stop13h 00m
Sun 18/1015:40 -
1 stop15h 00m
Deal found 30/9£419
Sat 10/1017:00 -
Nonstop10h 00m
Fri 23/1021:40 -
Nonstop9h 25m
Deal found 1/10£419
Wed 4/1111:55 -
1 stop13h 05m
Sun 15/1114:35 -
1 stop12h 20m
Deal found 2/10£421
Fri 9/1011:45 -
1 stop12h 50m
Tue 20/1006:00 -
1 stop17h 10m
Deal found 30/9£421
Wed 4/1111:55 -
1 stop13h 05m
Tue 17/1114:35 -
1 stop12h 20m
Deal found 2/10£421
Sun 13/1206:30 -
2 stops22h 12m
Sat 16/121:55 -
1 stop14h 15m
Deal found 30/9£421

Find flight deals from London to Washington

Round-trip from

£414

One-way from

£391

Popular in

August

Cheapest in

February

Average price

£546

Good round-trip deal

£431 or less

Good one-way deal

£399 or less
Icelandair
  • Icelandair
  • 3/11-15/11
  • 2 total stops
  • 49h 20m total
  • London to Washington
Search Deals
6/12-31/12
  • 6/12-31/12
  • 3 total stops
  • 38h 14m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£31 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 October 2026
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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.
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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

Wed 31/3

17:00-19:10

Nonstop10h 10m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£392

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 30/3

20:00-20:07

2 stops56h 07m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£398

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Tue 15/12

10:00-22:55

2 stops20h 55m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£399

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 17/11

16:20-19:17

3 stops34h 57m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£408

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sat 27/3

06:20-14:50

1 stop15h 30m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£426

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Fri 13/11

09:00-20:47

2 stops19h 47m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£430

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sun 13/12

14:45-17:00

Nonstop10h 15m

Seattle/Tacoma Intl

Thu 14/1

18:50-12:20

Nonstop9h 30m

£430

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Fri 27/11

12:20-14:50

Nonstop10h 30m

Seattle/Tacoma Intl

Tue 8/12

09:50-07:45

1 stop13h 55m

£430

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Tue 3/11

14:45-17:00

Nonstop10h 15m

Seattle/Tacoma Intl

Mon 16/11

18:45-12:20

Nonstop9h 35m

£430

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 8/3

08:55-14:55

1 stop14h 00m

Seattle/Tacoma Intl

Sun 14/3

18:00-10:40

Nonstop9h 40m

£430

Flights are sorted by cheapest return flights first.

Deals found on 3/10

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 £500). Flying from London to State of Washington in July is currently the most expensive (average of £649). 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 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 £447 and £609 in November.
The cheapest return price found within the last 5 days was £414 on Icelandair (3 Nov–15 Nov).

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
13,013 reviews
Check prices

Boarding

8.1

Entertainment

7.0

Overall

7.9

Food

7.0

Comfort

7.8

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
13,013 reviews
Alaska Airlines
7.9
Good
13,013 reviews
Check prices

Boarding

8.1

Entertainment

7.0

Overall

7.9

Food

7.0

Comfort

7.8

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
1,576 reviews
Alaska Airlines
7.9
Good
13,013 reviews
Check prices

Boarding

8.1

Entertainment

7.0

Overall

7.9

Food

7.0

Comfort

7.8

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
693 reviews
Alaska Airlines
7.9
Good
13,013 reviews
Check prices

Boarding

8.1

Entertainment

7.0

Overall

7.9

Food

7.0

Comfort

7.8

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
758 reviews
Alaska Airlines
7.9
Good
13,013 reviews
Check prices

Boarding

8.1

Entertainment

7.0

Overall

7.9

Food

7.0

Comfort

7.8

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
8,244 reviews
Alaska Airlines
7.9
Good
13,013 reviews
Check prices

Boarding

8.1

Entertainment

7.0

Overall

7.9

Food

7.0

Comfort

7.8

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 10h 15m. Fly via Alaska Airlines, Delta, or Icelandair 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 most popular routes from London to State of Washington?

    While some choose either London Gatwick - Seattle/Tacoma Intl or London City - 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 (83%), KLM (83%), SAUDIA (83%).

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

    On average you can expect to pay £1,844 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 £500). Flying from London to State of Washington in July is currently the most expensive (average of £649). 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

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Heathrow to Newark flights
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Stansted to Miami flights
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London City to Miami flights
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Heathrow to Atlanta flights
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Heathrow to Hobby flights
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London City to Orlando flights
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Gatwick to Los Angeles flights
Manchester to LaGuardia flights
London City to Los Angeles flights
Gatwick to Dallas/Fort Worth flights
Stansted to Los Angeles flights
Heathrow to George Bush Intcntl flights
Gatwick to Fort Lauderdale flights
Heathrow to Ontario flights
Gatwick to San Francisco flights
Luton to Orlando flights
Heathrow to Fort Lauderdale flights
Edinburgh to Newark flights
London City to San Francisco flights
Stansted to Dallas/Fort Worth flights

Top 10 airlines flying from London to Washington

AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£338Average£520FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£339Average£528FlexibilityNo cancel feeOn-time76%
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United AirlinesCheapest£375Average£496FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£396Average£651FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
DeltaCheapest£404Average£658FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Virgin AtlanticCheapest£413Average£702FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air FranceCheapest£415Average£617FlexibilityNo cancel feeOn-time77%
Search Air France flights
Alaska AirlinesCheapest£432Average£565FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
KLMCheapest£434Average£624FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£444Average£645FlexibilityNo cancel feeOn-time70%
Search British Airways 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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