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Cheap flights from London to Washington from £388

LON — SEA
9 Dec — 16 Dec1
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 2/1206:35 -
1 stop14h 25m
Wed 9/1208:09 -
1 stop14h 31m
Deal found 4/11£407
Wed 25/1117:50 -
1 stop25h 57m
Fri 4/1216:50 -
Nonstop9h 50m
Deal found 4/11£408
Thu 10/1209:25 -
Nonstop10h 00m
Fri 25/1218:45 -
Nonstop9h 25m
Deal found 5/11£409
Sat 26/1212:15 -
1 stop12h 45m
Tue 29/1214:35 -
1 stop12h 15m
Deal found 4/11£410
Thu 10/1209:25 -
Nonstop10h 00m
Thu 24/1213:40 -
Nonstop9h 30m
Deal found 8/11£411
Fri 13/1106:30 -
2 stops36h 47m
Tue 24/1116:50 -
Nonstop9h 50m
Deal found 4/11£413
Mon 23/1108:55 -
1 stop14h 19m
Sun 6/1216:50 -
Nonstop9h 50m
Deal found 4/11£413
Mon 23/1109:00 -
2 stops22h 07m
Sun 6/1215:15 -
1 stop12h 35m
Deal found 4/11£415
Fri 20/1106:30 -
1 stop13h 17m
Thu 3/1216:50 -
Nonstop9h 50m
Deal found 4/11£416
Thu 12/1106:30 -
1 stop13h 17m
Tue 24/1116:50 -
Nonstop9h 50m
Deal found 4/11£416
Sun 22/1106:20 -
1 stop16h 54m
Thu 3/1206:00 -
1 stop17h 45m
Deal found 5/11£417
Fri 20/1106:30 -
1 stop13h 17m
Sat 28/1116:50 -
Nonstop9h 50m
Deal found 5/11£418

Find flight deals from London to Washington

Round-trip from

£405

One-way from

£388

Popular in

August

Cheapest in

February

Average price

£493

Good round-trip deal

£425 or less

Good one-way deal

£393 or less
Icelandair
  • Icelandair
  • 6/5-9/5
  • 2 total stops
  • 45h 55m total
  • London to Washington
Search Deals
15/12-31/12
  • 15/12-31/12
  • 2 total stops
  • 36h 32m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£38 potential increase over avg. return price).
Search Deals
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 November 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
Fastest return journey

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 11/1

14:45-16:50

Nonstop10h 05m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£397

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sun 17/1

14:45-16:50

Nonstop10h 05m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£398

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Thu 14/1

11:45-22:02

2 stops18h 17m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£399

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 13/1

11:45-10:58

2 stops55h 13m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£399

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 11/1

07:30-19:38

2 stops20h 08m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£400

LondonSpokane

LHR London Heathrow - GEG Spokane

LHRGEG

London Heathrow

Wed 3/3

15:15-08:47

3 stops49h 32m

Spokane

Wed 31/12

00:00-09:00

Nonstop0h 00m

£402

LondonSeattle

LGW London Gatwick - SEA Seattle/Tacoma Intl

LGWSEA

London Gatwick

Mon 11/1

10:00-22:21

2 stops20h 21m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£404

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Mon 11/1

12:20-14:45

Nonstop10h 25m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£412

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Wed 25/11

06:30-11:47

1 stop13h 17m

Seattle/Tacoma Intl

Mon 30/11

11:30-10:00

1 stop14h 30m

£418

LondonSeattle

LHR London Heathrow - SEA Seattle/Tacoma Intl

LHRSEA

London Heathrow

Sat 9/1

10:45-18:56

2 stops16h 11m

Seattle/Tacoma Intl

Wed 31/12

00:00-09:00

Nonstop0h 00m

£420

Flights are sorted by cheapest return flights first.

Deals found on 5/11

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 £480). Flying from London to State of Washington in July 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 Thursday (19 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (13 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 £422 and £558 in May.
The cheapest return price found within the last 5 days was £405 on Icelandair (6 May–9 May).

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
13,158 reviews
Check prices

Comfort

7.8

Entertainment

7.0

Overall

7.9

Crew

8.5

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
13,158 reviews
Alaska Airlines
7.9
Good
13,158 reviews
Check prices

Comfort

7.8

Entertainment

7.0

Overall

7.9

Crew

8.5

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
1,595 reviews
Alaska Airlines
7.9
Good
13,158 reviews
Check prices

Comfort

7.8

Entertainment

7.0

Overall

7.9

Crew

8.5

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
7.5
Good
698 reviews
Alaska Airlines
7.9
Good
13,158 reviews
Check prices

Comfort

7.8

Entertainment

7.0

Overall

7.9

Crew

8.5

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
767 reviews
Alaska Airlines
7.9
Good
13,158 reviews
Check prices

Comfort

7.8

Entertainment

7.0

Overall

7.9

Crew

8.5

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
8,287 reviews
Alaska Airlines
7.9
Good
13,158 reviews
Check prices

Comfort

7.8

Entertainment

7.0

Overall

7.9

Crew

8.5

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 13h 14m. Fly via United Airlines, KLM, or Delta 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 (85%), KLM (84%), SAUDIA (84%).

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

    On average you can expect to pay £1,885 for a flight from London to State of Washington. The cheapest flight overall is £355 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £258.

  • 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 £480). Flying from London to State of Washington in July 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 John F Kennedy Intl flights
Heathrow to Newark flights
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Heathrow to LaGuardia flights
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Heathrow to Dulles Intl flights
Heathrow to San Francisco flights
Gatwick to Miami flights
Stansted to Miami flights
Heathrow to Baltimore flights
London City to Miami flights
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Manchester to Orlando flights
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Luton to Miami flights
Stansted to Orlando flights
London City to Orlando flights
Stansted to Los Angeles flights
London City to Los Angeles flights
Heathrow to O'Hare Intl flights
Edinburgh to Newark flights
Southend to John F Kennedy Intl flights
Heathrow to Hobby flights
Manchester to Newark flights
Heathrow to Atlanta flights
Manchester to LaGuardia flights
Heathrow to Ontario flights
Edinburgh to John F Kennedy Intl flights
Luton to Los Angeles flights
Heathrow to Tampa flights
Luton to Orlando flights
London City to Boston flights
Gatwick to Fort Lauderdale flights
Gatwick to Dulles Intl flights
Heathrow to George Bush Intcntl flights

Top 10 airlines flying from London to Washington

AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£326Average£512FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£336Average£523FlexibilityNo cancel feeOn-time76%
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United AirlinesCheapest£372Average£492FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£393Average£637FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
DeltaCheapest£395Average£656FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Virgin AtlanticCheapest£408Average£724FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air FranceCheapest£411Average£604FlexibilityNo cancel feeOn-time77%
Search Air France flights
KLMCheapest£418Average£618FlexibilityNo cancel feeOn-time75%
Search KLM flights
Alaska AirlinesCheapest£420Average£654FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
British AirwaysCheapest£433Average£637FlexibilityNo cancel feeOn-time70%
Search British Airways flights

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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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