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Cheap flights from London to St. Louis from £288

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 13/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — STL
24 Apr — 1 May1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London to Lambert-St Louis are usually found in January or February, booked 48 days in advance, depart on a Thursday or Tuesday and return on a Wednesday

Cheap flight deals from London to St. Louis

Enter your travel dates to find the best prices.

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 25 March 2026.

Mon 20/412:15
LHR
-
STL
1 stop16h 02m
Finnair
Thu 30/412:27
STL
-
LHR
1 stop19h 58m
Finnair
Deal found 23/3£588
Wed 2/910:05
LHR
-
STL
1 stop14h 13m
Finnair
Wed 23/912:47
STL
-
LHR
1 stop12h 08m
Finnair
Deal found 23/3£590
Mon 4/516:55
LHR
-
STL
1 stop22h 49m
Finnair
Mon 11/511:25
STL
-
LHR
2 stops14h 35m
Finnair
Deal found 24/3£590
Tue 5/511:00
LHR
-
STL
2 stops17h 19m
Finnair
Tue 12/517:49
STL
-
LHR
2 stops21h 51m
Finnair
Deal found 21/3£591
Wed 2/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 23/912:47
STL
-
LHR
1 stop12h 08m
British Airways
Deal found 20/3£593
Tue 21/416:25
LHR
-
STL
Nonstop9h 05m
Multiple Airlines
Tue 28/418:11
STL
-
LHR
1 stop11h 59m
Multiple Airlines
Deal found 24/3£599
Wed 13/518:05
LHR
-
STL
2 stops22h 49m
Finnair
Tue 19/517:49
STL
-
LHR
2 stops21h 51m
Finnair
Deal found 22/3£610
Mon 4/506:30
LHR
-
STL
2 stops17h 14m
Delta
Mon 11/509:15
STL
-
LHR
1 stop15h 10m
Delta
Deal found 20/3£610
Wed 9/916:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Wed 16/915:33
STL
-
LHR
1 stop15h 17m
American Airlines
Deal found 24/3£611
Mon 4/514:00
LGW
-
STL
1 stop15h 19m
Multiple Airlines
Mon 11/517:27
STL
-
LGW
2 stops30h 53m
Multiple Airlines
Deal found 24/3£611
Tue 21/416:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 28/421:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 24/3£614
Fri 8/514:00
LGW
-
STL
2 stops35h 23m
Multiple Airlines
Fri 15/516:19
STL
-
LGW
1 stop35h 41m
Multiple Airlines
Deal found 24/3£619

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 25 March 2026.

Round-trip from

£579

One-way from

£288

Popular in

August

Cheapest in

January

Average price

£687

Good round-trip deal

£732 or less

Good one-way deal

£1,826 or less
Virgin Atlantic
  • Virgin Atlantic
  • 20/4-30/4
  • 2 total stops
  • 29h 23m total
  • London to St. Louis
Search Deals
13/5
  • 13/5
  • 2 total stops
  • 30h 48m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£49 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in March 2026
Search Deals
Price to beat on a round-trip flight from London (LON) to Lambert-St Louis.
Search Deals
Price to beat on a one-way flight from London (LON) to Lambert-St Louis.
Search Deals

Cheapflights Fare Finder

 
Customise 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 858,174 searches. Data last updated 25 March 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 return flight

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Sat 9/5

14:00-00:21

1 stop16h 21m

Lambert-St Louis

Sat 16/5

17:27-10:00

2 stops34h 33m

£646

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 10/9

11:00-22:00

1 stop17h 00m

Lambert-St Louis

Mon 14/9

16:47-09:25

1 stop10h 38m

£657

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 1/5

12:15-19:33

1 stop13h 18m

Lambert-St Louis

Mon 4/5

14:33-10:30

1 stop13h 57m

£657

LondonSt. Louis

LCY - STL

LCYSTL

London City

Thu 30/4

15:30-19:29

2 stops33h 59m

Lambert-St Louis

Mon 4/5

08:54-13:20

2 stops22h 26m

£679

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 11/4

08:40-23:25

2 stops20h 45m

Lambert-St Louis

Sun 26/4

18:50-14:35

2 stops13h 45m

£683

LondonSt. Louis

LCY - STL

LCYSTL

London City

Thu 10/9

13:35-23:38

2 stops40h 03m

Lambert-St Louis

Mon 14/9

16:29-09:00

2 stops34h 31m

£684

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sat 18/4

06:30-16:50

2 stops16h 20m

Lambert-St Louis

Sat 25/4

11:42-07:15

1 stop13h 33m

£692

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 24/4

06:30-16:50

2 stops16h 20m

Lambert-St Louis

Fri 8/5

16:25-14:35

1 stop16h 10m

£693

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 24/4

14:00-23:19

1 stop15h 19m

Lambert-St Louis

Fri 8/5

16:19-10:00

1 stop35h 41m

£699

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 10/9

06:40-23:37

2 stops22h 57m

Lambert-St Louis

Mon 14/9

15:42-16:00

2 stops18h 18m

£704

Flights are sorted by cheapest return flights first.

Deals found on 25/3

Showing 1-10 of 60 resultsSorted by cheapest first
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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 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 St. Louis

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

Use this chart to determine the optimal time to book a return flight from London to St. Louis. Price data was last updated on 13 March 2026.

To ensure you get the cheapest price possible for a flight from London to St. Louis, you should look to book at least 48 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, September is the cheapest month in which you can book a flight from London to St. Louis (average of £406). Flying from London to St. Louis in December is currently the most expensive (average of £624). 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.

How much does it cost for a return flight from London to St. Louis?

What’s the top stopover airport for flights from London to St. Louis?

Share of one-stop return flights from London to St. Louis chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Chicago (ORD) – chosen by Cheapflights users on 54% of one-stop itineraries from London to St. Louis on Cheapflights.

What’s the cheapest stopover airport for flights from London to St. Louis?

Average return fare for one-stop flights from London to St. Louis, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Reykjavik (KEF) is the most affordable one-stop option, with an average return flight price of £375.

What’s the fastest stopover option from London to St. Louis?

Shortest average travel time for one-stop one-way flights from London to St. Louis, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Reykjavik (KEF) have the shortest average one-way travel time for one-stop routes: 11h 05m.

Which airport typically offers the quickest stopover for flights from London to St. Louis?

Average stopover duration for one-stop one-way flights from London to St. Louis, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Reykjavik (KEF) offer the fastest connection on this route, with an average stopover time of 0h 55m.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated 25 March 2026.
See what other customers who have flown with Finnair,Virgin Atlantic, andUnited Airlines from London to St. Louis have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.7
Good
1,374 reviews
Check prices

Comfort

7.5

Crew

8.2

Overall

7.7

Boarding

7.7

Entertainment

6.9

Food

6.7

Reviews

1 / 20
6.0
Good

Firuz,Feb 2026

FRA - HEL

Positive: Simple and quick check-in. It was refreshingly easy and polite check-in and boarding staff. Negative: We were delayed, and there was no communication. I am surprised that with an airline like Finnair, you do not get any snacks on a 2.5h flight. The flights are not as cheap as Ryanair, so a bit more service would be appreciated. The crew did not specify which drink was free and which was available for payment, as there was no menu at my seat.
Finnair
7.7
Good
1,374 reviews
Finnair
7.7
Good
1,374 reviews
Check prices

Comfort

7.5

Crew

8.2

Overall

7.7

Boarding

7.7

Entertainment

6.9

Food

6.7

Reviews

1 / 20
6.0
Good

Firuz,Feb 2026

FRA - HEL

Positive: Simple and quick check-in. It was refreshingly easy and polite check-in and boarding staff. Negative: We were delayed, and there was no communication. I am surprised that with an airline like Finnair, you do not get any snacks on a 2.5h flight. The flights are not as cheap as Ryanair, so a bit more service would be appreciated. The crew did not specify which drink was free and which was available for payment, as there was no menu at my seat.
Virgin Atlantic
7.5
Good
685 reviews
Finnair
7.7
Good
1,374 reviews
Check prices

Comfort

7.5

Crew

8.2

Overall

7.7

Boarding

7.7

Entertainment

6.9

Food

6.7

Reviews

1 / 20
6.0
Good

Firuz,Feb 2026

FRA - HEL

Positive: Simple and quick check-in. It was refreshingly easy and polite check-in and boarding staff. Negative: We were delayed, and there was no communication. I am surprised that with an airline like Finnair, you do not get any snacks on a 2.5h flight. The flights are not as cheap as Ryanair, so a bit more service would be appreciated. The crew did not specify which drink was free and which was available for payment, as there was no menu at my seat.
United Airlines
7.4
Good
9,478 reviews
Finnair
7.7
Good
1,374 reviews
Check prices

Comfort

7.5

Crew

8.2

Overall

7.7

Boarding

7.7

Entertainment

6.9

Food

6.7

Reviews

1 / 20
6.0
Good

Firuz,Feb 2026

FRA - HEL

Positive: Simple and quick check-in. It was refreshingly easy and polite check-in and boarding staff. Negative: We were delayed, and there was no communication. I am surprised that with an airline like Finnair, you do not get any snacks on a 2.5h flight. The flights are not as cheap as Ryanair, so a bit more service would be appreciated. The crew did not specify which drink was free and which was available for payment, as there was no menu at my seat.
Air Canada
7.1
Good
10,838 reviews
Finnair
7.7
Good
1,374 reviews
Check prices

Comfort

7.5

Crew

8.2

Overall

7.7

Boarding

7.7

Entertainment

6.9

Food

6.7

Reviews

1 / 20
6.0
Good

Firuz,Feb 2026

FRA - HEL

Positive: Simple and quick check-in. It was refreshingly easy and polite check-in and boarding staff. Negative: We were delayed, and there was no communication. I am surprised that with an airline like Finnair, you do not get any snacks on a 2.5h flight. The flights are not as cheap as Ryanair, so a bit more service would be appreciated. The crew did not specify which drink was free and which was available for payment, as there was no menu at my seat.
British Airways
6.7
Okay
7,819 reviews
Finnair
7.7
Good
1,374 reviews
Check prices

Comfort

7.5

Crew

8.2

Overall

7.7

Boarding

7.7

Entertainment

6.9

Food

6.7

Reviews

1 / 20
6.0
Good

Firuz,Feb 2026

FRA - HEL

Positive: Simple and quick check-in. It was refreshingly easy and polite check-in and boarding staff. Negative: We were delayed, and there was no communication. I am surprised that with an airline like Finnair, you do not get any snacks on a 2.5h flight. The flights are not as cheap as Ryanair, so a bit more service would be appreciated. The crew did not specify which drink was free and which was available for payment, as there was no menu at my seat.

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?

    Lambert-St Louis (STL) is the airport you will fly into if you book a flight from London to St. Louis. You should not have trouble finding flights to Lambert-St Louis from London; the airport handles an average of 0 inbound flights from London per day. You should also have plenty of airline options to choose from since 9 airlines have flights to the St. Louis airport from London. It is only a 12.7 mi journey from Lambert-St Louis (STL) to St. Louis’s city center.

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

    For as low as £657, British Airways can have you in St. Louis from London in 17h. Airlines will cover a distance of 4186 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

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

    Our cheapest airline available from London to St. Louis is American Airlines. Our recent data shows that you can find tickets from as low as £174 on this airline. Additional options worth looking into are United Airlines and British Airways, starting at £473 and £479 round-trip. These flights start at 76% lower than the current average price 3 months from now.

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

    To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at £343. United Airlines flights start at £358 while deals on Finnair start at £362 one-way.

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

    When deciding which route to take from London to St. Louis consider London Heathrow - Lambert-St Louis, London Gatwick - Lambert-St Louis or London Stansted - Lambert-St Louis as they are the most popular.

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

    The cheapest flight price from London to St. Louis is £582. On average you can expect to pay £1,387. The most popular route, (London Heathrow - Lambert-St Louis), can usually be booked for £590.

  • Where are the most common stopover locations when flying from London to St. Louis?

    The most popular stopover on flights from London to St. Louis is Chicago.

  • What are some popular things to do or see while on a stopover in Chicago?

    Grant Park, Magnificent Mile, and River North are currently the most popular points of interest in Chicago at the moment. Grant Park, Magnificent Mile, and River North are located about 16.2 mi, 15.5 mi, and 15.0 mi, respectively from Chicago O'Hare Intl. Travellers in need of a car in Chicago can hire one for about £39 per day.

  • Where are the least popular stopover locations for London to St. Louis flights?

    London to St. Louis flights have a stopover in Philadelphia the least frequently.

  • 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 holiday 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, September is the cheapest month in which you can book a flight from London to St. Louis (average of £406). Flying from London to St. Louis in December is currently the most expensive (average of £624). 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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Fly from London to St. Louis on these airlines

Choose from the following airlines for your flight from London to St. Louis. Flights are based on user searches made on Cheapflights and were last updated on 25 March 2026.
British Airways flights from London to Lambert-St Louis
Finnair flights from London to Lambert-St Louis
Virgin Atlantic flights from London to Lambert-St Louis

Top 9 airlines flying from London to St. Louis

Discover the top 9 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 858,174 searches. Data last updated 25 March 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£174Average£767FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest£473Average£736FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£479Average£756FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£520Average£826FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£556Average£777FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
FinnairCheapest£597Average£725FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Air CanadaCheapest£603Average£732FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
IberiaCheapest£657Average£722FlexibilityNo cancel feeOn-time77%
Search Iberia flights
LufthansaCheapest£660Average£802FlexibilityNo cancel feeOn-time76%
Search Lufthansa 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 St. Louis?

Cheapflights helps you search for flights from London to St. Louis via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from London to St. Louis?

Millions of users choose and trust Cheapflights to book the best flight deals from London to St. Louis for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from London to St. Louis with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from London to St. Louis flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from London to St. Louis become cheaper?

Not ready to book yet? You can track prices for flights from London to St. Louis on Cheapflights with our Price Alert feature and get notified when better prices are available.

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