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$214+ Cheap flights from Washington to London (LON)

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 4/21. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — LON
Apr 12 — Apr 191
Sun 4/12
Sun 4/19
1 adult, Economy
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Cheap flight deals from Washington to London

Cheapest flights from Washington to London
Explore the most affordable flight options available from Washington to London. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 13, 2026.

This Mytrip deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/307:00 pm
SEA
-
STN
2 stops21h 30m
Multiple Airlines
Sun 5/107:05 am
STN
-
SEA
2 stops16h 55m
Multiple Airlines
Deal found 3/8$584
This Mytrip deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/78:00 am
SEA
-
STN
2 stops22h 35m
Multiple Airlines
Tue 4/147:10 am
STN
-
SEA
3 stops23h 43m
Multiple Airlines
Deal found 3/8$586
This Mytrip deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/203:40 pm
SEA
-
LHR
2 stops21h 40m
Multiple Airlines
Tue 4/286:40 am
LHR
-
SEA
2 stops19h 15m
Multiple Airlines
Deal found 3/9$590
This Mytrip deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/133:40 pm
SEA
-
STN
2 stops22h 45m
Multiple Airlines
Mon 4/2712:00 pm
STN
-
SEA
2 stops16h 40m
Multiple Airlines
Deal found 3/10$591
This Mytrip deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/237:00 pm
SEA
-
LGW
1 stop11h 40m
Icelandair
Thu 4/303:40 pm
LGW
-
SEA
1 stop13h 00m
Icelandair
Deal found 3/9$591
This Mytrip deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:00 pm
SEA
-
LHR
1 stop17h 20m
Icelandair
Wed 4/299:25 pm
LHR
-
SEA
1 stop28h 30m
Icelandair
Deal found 3/8$591
This Mytrip deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 4/177:00 pm
SEA
-
STN
2 stops17h 30m
Multiple Airlines
Mon 4/277:15 pm
STN
-
SEA
2 stops28h 45m
Multiple Airlines
Deal found 3/8$592
This Mytrip deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/227:00 pm
SEA
-
LGW
1 stop11h 40m
Icelandair
Wed 4/293:40 pm
LGW
-
SEA
1 stop34h 15m
Icelandair
Deal found 3/8$595
This Kiwi.com deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/227:00 pm
SEA
-
LGW
1 stop11h 40m
Icelandair
Tue 10/63:40 pm
LGW
-
SEA
1 stop13h 00m
Icelandair
Deal found 3/9$597
This Mytrip deal was found by Cheapflights users on 3/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/223:40 pm
SEA
-
STN
2 stops22h 25m
Multiple Airlines
Wed 4/296:25 am
STN
-
SEA
2 stops19h 30m
Multiple Airlines
Deal found 3/8$598
This Gotogate deal was found by Cheapflights users on 3/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/133:40 pm
SEA
-
LGW
1 stop15h 00m
Icelandair
Tue 4/281:00 pm
LGW
-
SEA
1 stop12h 55m
Icelandair
Deal found 3/10$599
This Gotogate deal was found by Cheapflights users on 3/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/167:00 pm
SEA
-
LGW
1 stop11h 40m
Icelandair
Wed 5/133:40 pm
LGW
-
SEA
1 stop13h 00m
Icelandair
Deal found 3/9$600

Find flight deals from Washington to London

Keep the following information in mind while searching for Washington to London flight deals. Data was last updated March 13, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$584
(Mytrip)

One-way from

$214
(Trip.com)

Popular in

June

Cheapest in

October

Average price

$688

Good round-trip deal

$728 or less

Good one-way deal

$414 or less
Provider with most accurate pricing for Seattle/Tacoma Intl-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-London (LON) flights.
Search Deals
From Washington to London (LON)
Search Deals
One-way flight from Washington to London (LON)
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($126 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($21 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from Washington to London (LON).
Search Deals
Price to beat on a one-way flight from Washington to London (LON).
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Washington to London 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 2,558,603 searches. Data last updated March 13, 2026.
Use the filters below to find and compare flights from Washington to London that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandLondon

PDX - STN

PDXSTN

Portland

Tue 4/21

3:15 pm-9:20 pm

3 stops22h 05m

London Stansted

Mon 5/4

10:45 pm-7:05 pm

3 stops28h 20m

$693

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Wed 5/13

6:20 pm-12:10 pm

Nonstop9h 50m

London Heathrow

Thu 5/21

6:30 am-11:42 am

1 stop13h 12m

$700

SeattleLondon

SEA - LHR

SEALHR

Seattle/Tacoma Intl

Tue 4/7

6:20 pm-12:10 pm

Nonstop9h 50m

London Heathrow

Thu 4/23

5:45 pm-8:04 pm

Nonstop10h 19m

$729

PortlandLondon

PDX - LGW

PDXLGW

Portland

Tue 4/21

3:30 pm-9:15 pm

3 stops21h 45m

London Gatwick

Mon 5/4

3:40 pm-2:45 pm

3 stops31h 05m

$731

PortlandLondon

PDX - LHR

PDXLHR

Portland

Tue 4/7

2:00 pm-1:05 pm

1 stop15h 05m

London Heathrow

Tue 4/14

6:30 am-11:10 am

1 stop12h 40m

$734

SeattleLondon

SEA - LCY

SEALCY

Seattle/Tacoma Intl

Sun 4/5

1:45 pm-9:30 am

1 stop11h 45m

London City

Thu 4/23

9:20 am-4:30 pm

1 stop15h 10m

$734

PortlandLondon

PDX - LHR

PDXLHR

Portland

Mon 4/13

7:32 pm-3:35 pm

1 stop12h 03m

London Heathrow

Mon 4/27

7:15 pm-11:10 am

1 stop23h 55m

$734

SeattleLondon

SEA - STN

SEASTN

Seattle/Tacoma Intl

Wed 3/25

8:00 pm-10:15 pm

1 stop19h 15m

London Stansted

Fri 4/3

5:35 pm-5:15 pm

1 stop31h 40m

$754

PortlandLondon

PDX - LCY

PDXLCY

Portland

Mon 4/13

1:05 pm-9:30 am

1 stop12h 25m

London City

Mon 4/27

7:00 pm-11:10 am

1 stop24h 10m

$763

PortlandLondon

PDX - LCY

PDXLCY

Portland

Tue 4/7

1:05 pm-9:30 am

1 stop12h 25m

London City

Tue 4/14

7:00 pm-11:10 am

1 stop24h 10m

$763

Flights are sorted by cheapest round-trip 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 Washington to London

Have a flexible travel schedule? Discover the best time to fly to London from Washington with our price prediction graph.
Estimated round-trip 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 Washington to London

What is the cheapest month to book a flight from State of Washington to London?

Currently, February is the cheapest month in which you can book a flight from State of Washington to London (average of $494). Flying from State of Washington to London in June is currently the most expensive (average of $756). 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 WA to LON?

Find hourly flight availability from Washington to London. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 13, 2026.

When flying from State of Washington to London, 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 State of Washington to London

Explore weekly flight availability from Washington to London. 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 March 13, 2026.

The most flights from USWA to LON are scheduled on a Monday (15 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (12 on average).

How much does it cost to fly round-trip from State of Washington to London?

Related info for your journey

Find useful and relevant information for your journey from Washington to London. 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 State of Washington to London?

    Virgin Atlantic, Delta, and KLM can get you from State of Washington to London in just under 9h 50m. Your travel time can differ by up to 5h 15m. Airlines will cover a distance of 4783 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • What are the cheapest airlines to fly from State of Washington to London one-way?

    One-way options have recently been found by users for as low as $162 on Icelandair. Other airlines that offer cheap prices include WestJet from $231 and Aer Lingus from $321 one-way.

  • What are the most popular routes from State of Washington to London?

    The most popular route from State of Washington to London is Seattle/Tacoma Intl - London Heathrow. You may also consider Seattle/Tacoma Intl - London Gatwick or Seattle/Tacoma Intl - London Stansted.

  • What are the most reliable airlines from State of Washington to London?

    No one likes to see their flight delayed. When booking a flight from State of Washington to London consider choosing American Airlines (87%), Alaska Airlines (87%) or Aer Lingus (87%) as they are the most reliable in getting you off to your destination on time.

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

    The cheapest flight price from State of Washington to London is $266. On average you can expect to pay $2,342. The most popular route, (Seattle/Tacoma Intl - London Heathrow), can usually be booked for $605.

  • Can I find deals for flights from Washington to London that include hotel bookings?

    Yes. In addition to deals on Washington to London flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Washington to London?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Washington to London.

  • Can I find deals for business class flights from Washington to London?

    Yes. Cheapflights offers flight deals from Washington to London 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 State of Washington to London?

    Currently, February is the cheapest month in which you can book a flight from State of Washington to London (average of $494). Flying from State of Washington to London in June is currently the most expensive (average of $756). 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

Traveling to a place near London?

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Browse thousands of different options on Cheapflights for your next trip

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Top 10 airlines flying from Washington to London

Discover the top 10 airlines that operate flights from Washington to London. 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 2,558,603 searches. Data last updated March 13, 2026.
AirlineCheapestAverageFlexibilityOn-time
IcelandairCheapest$482Average$621FlexibilityNo cancel feeOn-time76%
Aer LingusCheapest$500Average$723FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$515Average$854FlexibilityNo cancel feeOn-time71%
British AirwaysCheapest$527Average$727FlexibilityNo cancel feeOn-time70%
Scandinavian AirlinesCheapest$532Average$884FlexibilityNo cancel feeOn-time77%
Air FranceCheapest$532Average$757FlexibilityNo cancel feeOn-time77%
United AirlinesCheapest$547Average$860FlexibilityNo cancel feeOn-time69%
FinnairCheapest$556Average$694FlexibilityNo cancel feeOn-time76%
DeltaCheapest$559Average$919FlexibilityNo cancel feeOn-timeN/A
IberiaCheapest$565Average$744FlexibilityNo cancel feeOn-time77%

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