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St. Louis

$377+ Cheap flights from London (LON) to St. Louis (STL)

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 9/4. Fares are subject to change and may not be available on all flights or dates of travel.
LON — STL
Sep 11 — Sep 181
Fri 9/11
Fri 9/18
1 adult, Economy
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Cheapflights Tip: The best prices from London to Lambert-St Louis are usually found in February or January, booked 21 days in advance, depart on a Monday or Wednesday and return on a Thursday

Cheap flight deals from London to St. Louis

Cheapest flights from London to St. Louis
Explore the most affordable flight options available from London to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 12, 2026.

This Kiwi.com deal was found by Cheapflights users on 8/11. 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.
Sun 9/202:00 pm -
2 stops29h 10m
Sun 9/275:19 pm -
1 stop34h 41m
Deal found 8/11$701
This Kiwi.com deal was found by Cheapflights users on 8/12. 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.
Fri 9/42:00 pm -
1 stop32h 11m
Thu 9/246:39 pm -
1 stop33h 21m
Deal found 8/12$712
This Kiwi.com deal was found by Cheapflights users on 8/11. 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.
Fri 9/42:00 pm -
1 stop32h 11m
Fri 9/182:29 pm -
2 stops33h 51m
Deal found 8/11$729
This Kiwi.com deal was found by Cheapflights users on 8/12. 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.
Wed 9/22:00 pm -
1 stop32h 11m
Wed 9/232:29 pm -
2 stops33h 51m
Deal found 8/12$751
This Kiwi.com deal was found by Cheapflights users on 8/12. 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.
Sat 9/262:00 pm -
1 stop32h 34m
Sat 10/38:10 pm -
2 stops55h 50m
Deal found 8/12$788
This Travcart deal was found by Cheapflights users on 8/10. 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 Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/158:55 am -
1 stop16h 12m
Tue 9/299:35 pm -
Nonstop8h 00m
Deal found 8/10$792
This TravelUp deal was found by Cheapflights users on 8/10. 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 TravelUp is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/176:40 am -
2 stops23h 14m
Sun 11/112:00 pm -
2 stops22h 00m
Deal found 8/10$798
This Travcart deal was found by Cheapflights users on 8/11. 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 Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/166:05 pm -
2 stops56h 39m
Wed 9/235:18 pm -
1 stop11h 32m
Deal found 8/11$809
This Scandinavian Airlines deal was found by Cheapflights users on 8/7. 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 Scandinavian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/305:00 pm -
2 stops36h 42m
Sat 10/33:54 pm -
2 stops18h 06m
Deal found 8/7$811
This Kiwi.com deal was found by Cheapflights users on 8/10. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/42:00 pm -
1 stop32h 11m
Sun 9/208:10 pm -
2 stops36h 30m
Deal found 8/10$818
This Travcart deal was found by Cheapflights users on 8/9. 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 Travcart is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/24:25 pm -
Nonstop9h 05m
Wed 9/2312:46 pm -
1 stop19h 39m
Deal found 8/9$826
This Cheapflightsfares deal was found by Cheapflights users on 8/10. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/76:30 am -
1 stop12h 55m
Tue 9/156:53 pm -
1 stop11h 02m
Deal found 8/10$827

Find flight deals from London to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from London (LON) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated August 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$701
(Kiwi.com)

One-way from

$377
(Kiwi.com)

Popular in

December

Cheapest in

February

Average price

$1,179

Good one-way deal

$583 or less
Provider with most accurate pricing for London (LON)-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for London (LON)-Lambert-St Louis flights.
Search Deals
From London (LON) to Lambert-St Louis
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One-way flight from London (LON) to Lambert-St Louis
Search Deals
Highest demand for flights based on searches. 1% potential increase in price ($13 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($19 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in August 2026
Search Deals
Price to beat on a one-way flight from London (LON) to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from London to St. Louis 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 August 12, 2026.
Use the filters below to find and compare flights from London to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

LondonSt. Louis

LHR London Heathrow - STL Lambert-St Louis

LHRSTL

London Heathrow

Wed 9/30

5:00 pm-11:42 pm

2 stops36h 42m

Lambert-St Louis

Sat 10/3

3:54 pm-4:00 pm

2 stops18h 06m

$812
Quickest round-trip

LondonSt. Louis

LHR London Heathrow - STL Lambert-St Louis

LHRSTL

London Heathrow

Wed 9/9

8:40 am-7:16 pm

2 stops16h 36m

Lambert-St Louis

Wed 9/16

12:59 pm-6:45 am

1 stop11h 46m

$852

LondonSt. Louis

LHR London Heathrow - STL Lambert-St Louis

LHRSTL

London Heathrow

Wed 9/9

8:40 am-7:16 pm

2 stops16h 36m

Lambert-St Louis

Wed 9/23

10:53 am-7:15 am

2 stops14h 22m

$852

LondonSt. Louis

LGW London Gatwick - STL Lambert-St Louis

LGWSTL

London Gatwick

Sun 9/6

2:00 pm-5:22 pm

2 stops33h 22m

Lambert-St Louis

Sun 9/13

5:19 pm-10:00 am

1 stop34h 41m

$858

LondonSt. Louis

LHR London Heathrow - STL Lambert-St Louis

LHRSTL

London Heathrow

Mon 9/7

6:50 am-5:06 pm

2 stops16h 16m

Lambert-St Louis

Mon 9/14

3:32 pm-10:40 am

2 stops13h 08m

$859

LondonSt. Louis

LHR London Heathrow - STL Lambert-St Louis

LHRSTL

London Heathrow

Tue 11/10

6:50 am-3:43 pm

2 stops14h 53m

Lambert-St Louis

Sun 11/15

6:00 am-7:10 am

2 stops43h 10m

$860

LondonSt. Louis

LHR London Heathrow - STL Lambert-St Louis

LHRSTL

London Heathrow

Sun 9/20

9:30 am-1:25 pm

1 stop33h 55m

Lambert-St Louis

Sun 9/27

4:50 pm-8:40 pm

1 stop21h 50m

$872

LondonSt. Louis

LHR London Heathrow - STL Lambert-St Louis

LHRSTL

London Heathrow

Tue 9/8

3:30 pm-1:25 pm

1 stop27h 55m

Lambert-St Louis

Tue 9/15

8:30 am-6:45 am

1 stop16h 15m

$872

LondonSt. Louis

LHR London Heathrow - STL Lambert-St Louis

LHRSTL

London Heathrow

Sun 9/6

9:30 am-1:25 pm

1 stop33h 55m

Lambert-St Louis

Sun 9/13

4:50 pm-8:40 pm

1 stop21h 50m

$872

LondonSt. Louis

LCY London City - STL Lambert-St Louis

LCYSTL

London City

Tue 9/15

8:25 am-8:35 pm

2 stops18h 10m

Lambert-St Louis

Tue 9/29

5:47 pm-4:40 pm

2 stops16h 53m

$888

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 60 resultsSorted by cheapest first
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Compare providers for flights from London to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from London to St. Louis in August.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars
eDreamsPrice Accuracy2 starsTrust Score*3 stars
Thrive TravelPrice Accuracy3 starsTrust Score*2 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on London-St. Louis flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on London-St. Louis flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from London-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on London-St. Louis flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for London-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from London to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from London 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 London to St. Louis

What is the cheapest month to book a flight from London to St. Louis?

Currently, February is the cheapest month in which you can book a flight from London to St. Louis (average of $765). Flying from London to St. Louis in December is currently the most expensive (average of $1,262). 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 STL?

Find hourly flight availability from London to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 12, 2026.

When flying from London to St. Louis, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

How much does it cost to fly round-trip from London to St. Louis?

Airfare is below average for this route at the moment.
London to St. Louis flights typically cost between $922 and $1,356 in September.
The cheapest round-trip price found within the last 5 days was $701 on Multiple Airlines (Sep 20-Sep 27).

How often are flights from London to St. Louis delayed?

About 12% of weekly flights between London and St. Louis have experienced delays in the past year, with the average delay time being 118 minutes.

What is the most punctual flight time for London to St. Louis flights?

Historically, flights departing in the early afternoon are less likely to be delayed, whereas flights leaving in the early afternoon tend to experience delays more often.

What day of the week experiences the fewest flight delays on this route?

Friday tends to have the lowest number of delays on this route, whereas Wednesday has historically faced a higher average of delays compared to other days of the week.

Which airline has the best punctuality record on London to St. Louis flights?

Over the last year, British Airways have had the lowest number of delays on this route, with just 12% of flights being delayed.

How far ahead should I book a flight from London to St. Louis?

Booking 70 days in advance of your planned departure date is, on average, the best time to get cheap flights from London to St. Louis. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

Related info for your journey

Find useful and relevant information for your journey from London to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to St. Louis from London?

    If you book a flight to St. Louis from London, you will be flying to Lambert-St Louis, which is the city’s only airport. Lambert-St Louis (STL) is located 12.7 mi from the center of St. Louis. There are 2 flights from London to Lambert-St Louis per day from 2 different airlines.

  • How long is the flight from London to St. Louis?

    A quick flight from London to St. Louis can take about 16h 36m. Scandinavian Airlines provides one of the quickest options available for as low as $852. There are 4186 mi between London and St. Louis. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from London to St. Louis round-trip?

    Our cheapest airline available from London to St. Louis is British Airways. Our recent data shows that you can find tickets from as low as $791 on this airline. An additional option worth looking into is American Airlines, starting at $803. British Airways is currently priced 20% below the average price you’ll pay for this route.

  • What are the cheapest airlines to fly from London to St. Louis one-way?

    $438 is the cheapest one-way deal found within the past few days, from Finnair. You may also be able to find cheap deals on British Airways and American Airlines, with prices starting from $519 and $575, respectively.

  • What are the most popular routes from London to St. Louis?

    While some choose either London Gatwick - Lambert-St Louis or London Stansted - Lambert-St Louis, London Heathrow - Lambert-St Louis is the most popular route from London to St. Louis.

  • What are the most reliable airlines from London to St. Louis?

    Consider American Airlines (77%), Aer Lingus (77%) or Finnair (77%) when booking your flight. These represent the most reliable airlines when flying from London to St. Louis.

  • What are the cheapest flights from London to St. Louis?

    The cheapest flight price from London to St. Louis is $583. On average you can expect to pay $1,382. The most popular route, (London Heathrow - Lambert-St Louis), can usually be booked for $781.

  • Can I find deals for flights from London to St. Louis that include hotel bookings?

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

  • How can I find direct flights from London to St. Louis?

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

  • Can I find deals for business class flights from London to St. Louis?

    Yes. Cheapflights offers flight deals from London to St. Louis 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 St. Louis?

    Currently, February is the cheapest month in which you can book a flight from London to St. Louis (average of $765). Flying from London to St. Louis in December is currently the most expensive (average of $1,262). 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 St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
Fairview Heights
O'Fallon
Fenton
Swansea
Eureka
Maryland Heights
Collinsville
Wentzville
Glencoe
Chesterfield
Farmington

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Top 2 airlines flying from London to St. Louis

Discover the top 2 airlines that operate flights from London to St. Louis. 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 August 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
British AirwaysCheapest$791Average$964FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$803Average$1,384FlexibilityNo cancel feeOn-time71%

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