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Cheap flights from London to Washington from £304

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 12/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
16 Jan — 23 Jan1
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 17 December 2025.

Wed 24/1212:15LHR - SEA
1 stop12h 45mIcelandair
Fri 9/114:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 16/12£460
Wed 24/1212:15LHR - SEA
1 stop12h 45mIcelandair
Tue 6/114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 16/12£474
Tue 23/1220:35LHR - SEA
1 stop28h 25mIcelandair
Tue 6/114:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 15/12£513
Tue 30/1213:00LHR - SEA
1 stop17h 25mMultiple Airlines
Wed 4/206:05SEA - LHR
1 stop18h 40mMultiple Airlines
Deal found 16/12£553
Wed 24/1212:15LHR - SEA
1 stop12h 45mIcelandair
Sun 28/1214:35SEA - LHR
1 stop12h 15mIcelandair
Deal found 16/12£564
Tue 23/1220:35LHR - SEA
1 stop28h 25mIcelandair
Mon 29/1214:35SEA - LHR
1 stop20h 55mIcelandair
Deal found 15/12£608
Wed 24/1216:30LHR - SEA
1 stop34h 44mFinnair
Tue 6/118:50SEA - LHR
Nonstop9h 30mFinnair
Deal found 16/12£628
Wed 24/1212:20LHR - SEA
Nonstop10h 38mAir France
Wed 31/1206:10SEA - LHR
1 stop16h 55mAir France
Deal found 15/12£636
Tue 30/1220:05LCY - SEA
2 stops30h 21mKLM
Wed 4/209:05SEA - LCY
2 stops16h 25mKLM
Deal found 16/12£671
Fri 26/1211:50LHR - PDX
1 stop17h 34mAmerican Airlines
Fri 9/106:00PDX - LHR
1 stop18h 15mAmerican Airlines
Deal found 16/12£697
Wed 24/1220:50LTN - SEA
2 stops26h 50mMultiple Airlines
Wed 31/1214:35SEA - LTN
2 stops23h 20mMultiple Airlines
Deal found 15/12£773
Wed 31/1206:30LHR - PDX
1 stop12h 55mKLM
Fri 9/113:30PDX - LHR
1 stop13h 00mKLM
Deal found 15/12£774

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 17 December 2025.

Round-trip from

£442

One-way from

£304

Popular in

July

Cheapest in

January

Average price

£636

Good round-trip deal

£505 or less

Good one-way deal

£537 or less
7/2-22/2
  • 7/2-22/2
  • 1 total stop
  • 23h 09m total
  • London to Washington
Search Deals
12/5
  • 12/5
  • 3 total stops
  • 32h 41m total
  • London to Washington
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£60 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£10 potential savings vs. average return price).
Search Deals
Average for round-trip flights in December 2025
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 17 December 2025.
Use the filters below to find and compare flights from London to Washington that are best for you.

Fly from

London

Fly to

Washington

Route

Depart

Return

Price

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 23/1

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

Tue 27/1

18:50-12:20

Nonstop9h 30m

£451

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 19/4

09:50-11:35

Nonstop9h 45m

Seattle/Tacoma Intl

Thu 30/4

20:20-13:45

Nonstop9h 25m

£451

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 17/1

09:25-11:30

Nonstop10h 05m

Seattle/Tacoma Intl

Thu 29/1

18:50-12:20

Nonstop9h 30m

£464

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Fri 16/1

09:25-11:30

Nonstop10h 05m

Seattle/Tacoma Intl

Tue 20/1

18:50-12:20

Nonstop9h 30m

£466

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 15/1

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

Tue 20/1

13:25-07:00

Nonstop9h 35m

£466

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 17/1

09:25-11:30

Nonstop10h 05m

Seattle/Tacoma Intl

Sun 25/1

18:50-12:20

Nonstop9h 30m

£495

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 22/1

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

Sun 25/1

18:50-12:20

Nonstop9h 30m

£495

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 10/3

06:00-22:45

2 stops23h 45m

Seattle/Tacoma Intl

Tue 24/3

10:55-13:00

2 stops19h 05m

£522

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Tue 13/1

09:25-11:30

Nonstop10h 05m

Seattle/Tacoma Intl

Sat 17/1

09:52-06:50

1 stop36h 58m

£522

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Mon 9/2

06:00-22:43

2 stops24h 43m

Seattle/Tacoma Intl

Mon 23/2

12:32-17:50

2 stops21h 18m

£522

Flights are sorted by cheapest return flights first.

Deals found on 16/12

Showing 1-10 of 60 results
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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
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, March is the cheapest month in which you can book a flight from London to State of Washington (average of £304). Flying from London to State of Washington in August is currently the most expensive (average of £460). 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 17 December 2025.

When flying from London to State of Washington, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 1% versus a flight at midday.

What is the cheapest day to fly from London to State of Washington?

Use this chart to determine the cheapest time to fly return from London to Washington. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London to State of Washington flight should consider departing on Wednesday mornings when fares are most often at their lowest. Friday afternoons flights should be avoided if possible as fares are typically the most expensive at this time.

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 17 December 2025.

The most flights from LON to USWA are scheduled on a Tuesday (21 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (11 on average).

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

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 17 December 2025.
Check out reviews from past customers who have flown with KLM, Virgin Atlantic, andAir France 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.
KLM
7.7
Good
1,430 reviews
Check prices

Crew

8.4

Entertainment

7.1

Comfort

7.6

Food

7.2

Overall

7.7

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
KLM
7.7
Good
1,430 reviews
KLM
7.7
Good
1,430 reviews
Check prices

Crew

8.4

Entertainment

7.1

Comfort

7.6

Food

7.2

Overall

7.7

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Virgin Atlantic
7.5
Good
675 reviews
KLM
7.7
Good
1,430 reviews
Check prices

Crew

8.4

Entertainment

7.1

Comfort

7.6

Food

7.2

Overall

7.7

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Air France
7.4
Good
1,506 reviews
KLM
7.7
Good
1,430 reviews
Check prices

Crew

8.4

Entertainment

7.1

Comfort

7.6

Food

7.2

Overall

7.7

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Icelandair
7.0
Good
591 reviews
KLM
7.7
Good
1,430 reviews
Check prices

Crew

8.4

Entertainment

7.1

Comfort

7.6

Food

7.2

Overall

7.7

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
British Airways
6.7
Okay
7,583 reviews
KLM
7.7
Good
1,430 reviews
Check prices

Crew

8.4

Entertainment

7.1

Comfort

7.6

Food

7.2

Overall

7.7

Boarding

7.8

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle

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. Fly via British Airways, SWISS, 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 cheapest airlines to fly from London to State of Washington one-way?

    To fly one-way, consider booking your trip with WestJet, which is currently one of the cheapest options available, starting at £252. British Airways flights start at £371 while deals on Icelandair start at £376 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 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 (97%), Air France (93%), Delta (90%).

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

    On average you can expect to pay £1,733 for a flight from London to State of Washington. The cheapest flight overall is £412 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £378.

  • 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, March is the cheapest month in which you can book a flight from London to State of Washington (average of £304). Flying from London to State of Washington in August is currently the most expensive (average of £460). 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 17 December 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£325Average£486FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£385Average£608FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£396Average£557FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
KLMCheapest£398Average£609FlexibilityNo cancel feeOn-time75%
Search KLM flights
FinnairCheapest£398Average£579FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£406Average£608FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Aer LingusCheapest£418Average£671FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£438Average£596FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£440Average£621FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapest£445Average£583FlexibilityNo cancel feeOn-timeN/A
Search Delta 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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