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Cheap flights from London to Washington from £311

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 21/1. Fares are subject to change and may not be available on all flights or dates of travel.
LON — SEA
20 Jan — 27 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 21 December 2025.

Thu 25/1213:00LHR - SEA
1 stop17h 16mUnited Airlines
Mon 29/1212:44SEA - LHR
1 stop12h 56mUnited Airlines
Deal found 18/12£465
Thu 25/1212:05LHR - SEA
1 stop16h 52mAustrian Airlines
Tue 6/108:10SEA - LHR
1 stop14h 30mAustrian Airlines
Deal found 20/12£481
Mon 29/1209:00LHR - SEA
1 stop34h 25mDelta
Mon 28/920:25SEA - LHR
Nonstop9h 50mDelta
Deal found 20/12£503
Mon 29/1209:00LHR - SEA
1 stop34h 25mDelta
Sun 4/1015:55SEA - LHR
1 stop30h 35mDelta
Deal found 20/12£507
Mon 29/1209:00LHR - SEA
1 stop34h 25mDelta
Thu 1/1007:05SEA - LHR
2 stops19h 45mDelta
Deal found 20/12£508
Wed 31/1208:55LHR - SEA
2 stops22h 30mDelta
Wed 30/911:50SEA - LHR
1 stop15h 10mDelta
Deal found 20/12£558
Fri 26/1206:35LHR - SEA
2 stops24h 11mMultiple Airlines
Sun 4/110:52SEA - LHR
1 stop13h 03mMultiple Airlines
Deal found 19/12£563
Tue 30/1216:35LHR - SEA
1 stop25h 51mDelta
Thu 1/1009:30SEA - LHR
2 stops15h 30mDelta
Deal found 20/12£573
Fri 26/1210:55LHR - SEA
1 stop15h 25mBritish Airways
Tue 30/1210:32SEA - LHR
1 stop14h 03mBritish Airways
Deal found 19/12£580
Fri 26/1211:35LHR - SEA
1 stop14h 31mLufthansa
Sun 4/113:35SEA - LHR
1 stop14h 25mLufthansa
Deal found 19/12£584
Wed 31/1213:05LHR - SEA
1 stop16h 45mDelta
Fri 2/1011:15SEA - LHR
1 stop15h 00mDelta
Deal found 20/12£587
Wed 31/1212:05LHR - PDX
1 stop39h 38mUnited Airlines
Fri 9/119:00PDX - LHR
1 stop32h 50mUnited Airlines
Deal found 19/12£614

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 21 December 2025.

Round-trip from

£383

One-way from

£311

Popular in

July

Cheapest in

January

Average price

£638

Good round-trip deal

£506 or less

Good one-way deal

£538 or less
3/2-10/2
  • 3/2-10/2
  • 4 total stops
  • 38h 15m total
  • London to Washington
Search Deals
21/1
  • 21/1
  • 2 total stops
  • 55h 32m 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 21 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

Sat 17/1

06:30-11:50

1 stop13h 20m

Seattle/Tacoma Intl

Sat 24/1

18:25-11:55

Nonstop9h 30m

£445

LondonSeattle

LCY - SEA

LCYSEA

London City

Fri 13/2

20:05-11:40

1 stop23h 35m

Seattle/Tacoma Intl

Mon 16/2

15:05-16:35

1 stop17h 30m

£448

LondonSeattle

LCY - SEA

LCYSEA

London City

Mon 2/2

10:00-08:41

2 stops30h 41m

Seattle/Tacoma Intl

Sun 1/3

06:00-08:10

2 stops18h 10m

£449

LondonSeattle

LCY - SEA

LCYSEA

London City

Sun 1/3

17:50-11:35

1 stop25h 45m

Seattle/Tacoma Intl

Sun 8/3

16:00-19:35

1 stop20h 35m

£449

LondonSeattle

LCY - SEA

LCYSEA

London City

Mon 12/1

17:05-11:50

1 stop26h 45m

Seattle/Tacoma Intl

Sun 18/1

15:10-16:35

1 stop17h 25m

£449

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 14/2

09:25-11:30

Nonstop10h 05m

Seattle/Tacoma Intl

Wed 25/2

18:50-12:20

Nonstop9h 30m

£451

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sat 31/1

15:05-17:10

Nonstop10h 05m

Seattle/Tacoma Intl

Sun 1/3

22:20-06:50

1 stop24h 30m

£453

LondonSeattle

LCY - SEA

LCYSEA

London City

Tue 20/1

09:20-22:25

2 stops21h 05m

Seattle/Tacoma Intl

Fri 30/1

07:40-09:30

2 stops17h 50m

£453

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Thu 22/1

14:55-16:55

Nonstop10h 00m

Seattle/Tacoma Intl

Mon 26/1

14:04-11:35

1 stop13h 31m

£457

LondonSeattle

LHR - SEA

LHRSEA

London Heathrow

Sun 1/3

12:20-14:45

Nonstop10h 25m

Seattle/Tacoma Intl

Sun 8/3

17:40-10:30

Nonstop9h 50m

£457

Flights are sorted by cheapest return flights first.

Deals found on 18/12

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 £305). Flying from London to State of Washington in August is currently the most expensive (average of £461). 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 21 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 21 December 2025.

The most flights from LON to USWA are scheduled on a Saturday (21 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (7 on average).

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 21 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
1,429 reviews
Check prices

Food

7.2

Entertainment

7.1

Crew

8.3

Boarding

7.8

Comfort

7.6

Overall

7.7

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
1,429 reviews
KLM
7.7
Good
1,429 reviews
Check prices

Food

7.2

Entertainment

7.1

Crew

8.3

Boarding

7.8

Comfort

7.6

Overall

7.7

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
1,429 reviews
Check prices

Food

7.2

Entertainment

7.1

Crew

8.3

Boarding

7.8

Comfort

7.6

Overall

7.7

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
1,509 reviews
KLM
7.7
Good
1,429 reviews
Check prices

Food

7.2

Entertainment

7.1

Crew

8.3

Boarding

7.8

Comfort

7.6

Overall

7.7

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
592 reviews
KLM
7.7
Good
1,429 reviews
Check prices

Food

7.2

Entertainment

7.1

Crew

8.3

Boarding

7.8

Comfort

7.6

Overall

7.7

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
7,600 reviews
KLM
7.7
Good
1,429 reviews
Check prices

Food

7.2

Entertainment

7.1

Crew

8.3

Boarding

7.8

Comfort

7.6

Overall

7.7

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 05m. Fly via KLM, Virgin Atlantic, or British Airways 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 £372 while deals on Icelandair start at £377 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 £1,736 for a flight from London to State of Washington. The cheapest flight overall is £413 while the most popular route, (London Heathrow - Seattle/Tacoma Intl) is currently priced at £322.

  • 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 £305). Flying from London to State of Washington in August is currently the most expensive (average of £461). 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 21 December 2025.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest£326Average£485FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
Air FranceCheapest£388Average£613FlexibilityNo cancel feeOn-time77%
Search Air France flights
LufthansaCheapest£397Average£549FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
KLMCheapest£397Average£610FlexibilityNo cancel feeOn-time75%
Search KLM flights
United AirlinesCheapest£407Average£609FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FinnairCheapest£413Average£579FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Aer LingusCheapest£419Average£672FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£438Average£599FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Virgin AtlanticCheapest£441Average£622FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
DeltaCheapest£446Average£581FlexibilityNo 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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