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Cheap flights from London to St. Louis from £352

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 31/5. Fares are subject to change and may not be available on all flights or dates of travel.
LON — STL
4 Jun — 11 Jun1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London to Lambert-St Louis are usually found in January or March, booked 79 days in advance, depart on a Thursday or Monday 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 5 May 2026.

Wed 9/916:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Thu 17/906:20
STL
-
LHR
1 stop18h 30m
American Airlines
Deal found 2/5£634
Wed 2/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 23/912:47
STL
-
LHR
1 stop12h 08m
British Airways
Deal found 4/5£635
Wed 2/911:15
LHR
-
STL
1 stop12h 47m
Virgin Atlantic
Wed 23/913:30
STL
-
LHR
1 stop11h 45m
Virgin Atlantic
Deal found 4/5£637
Mon 7/914:45
LHR
-
STL
1 stop15h 14m
American Airlines
Wed 16/914:45
STL
-
LHR
1 stop10h 55m
American Airlines
Deal found 2/5£638
Tue 22/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Tue 6/1021:35
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 1/5£642
Thu 25/614:00
LGW
-
STL
1 stop15h 49m
Multiple Airlines
Thu 9/716:09
STL
-
LGW
1 stop35h 51m
Multiple Airlines
Deal found 4/5£643
Tue 22/916:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Tue 6/1021:35
STL
-
LHR
Nonstop8h 00m
American Airlines
Deal found 4/5£644
Tue 8/906:30
LHR
-
STL
1 stop12h 55m
Multiple Airlines
Tue 22/920:07
STL
-
LHR
1 stop10h 08m
Multiple Airlines
Deal found 4/5£646
Mon 9/1110:15
LHR
-
STL
1 stop15h 15m
Multiple Airlines
Fri 13/1115:59
STL
-
LHR
1 stop14h 01m
Multiple Airlines
Deal found 30/4£648
Tue 8/909:55
LHR
-
STL
2 stops16h 36m
Delta
Tue 22/916:13
STL
-
LHR
1 stop13h 52m
Delta
Deal found 30/4£649
Mon 1/614:00
LGW
-
STL
1 stop15h 57m
Multiple Airlines
Mon 8/616:19
STL
-
LGW
1 stop35h 41m
Multiple Airlines
Deal found 2/5£657
Sun 1/1117:50
LCY
-
STL
2 stops28h 08m
KLM
Wed 11/1111:51
STL
-
LCY
2 stops13h 24m
KLM
Deal found 3/5£683

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 5 May 2026.

Round-trip from

£634

One-way from

£352

Popular in

July

Cheapest in

January

Average price

£702

Good round-trip deal

£724 or less
American Airlines
  • American Airlines
  • 9/9-17/9
  • 1 total stop
  • 27h 35m total
  • London to St. Louis
Search Deals
31/5
  • 31/5
  • 1 total stop
  • 26h 29m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£65 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 May 2026
Search Deals
Price to beat on a round-trip 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 5 May 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
Fastest return journey

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 8/9

12:15-23:59

1 stop17h 44m

Lambert-St Louis

Tue 22/9

21:35-11:35

Nonstop8h 00m

£651

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 2/9

06:30-16:45

2 stops16h 15m

Lambert-St Louis

Wed 23/9

13:30-10:20

2 stops14h 50m

£654

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 2/9

09:55-20:31

2 stops16h 36m

Lambert-St Louis

Wed 23/9

10:45-06:45

2 stops14h 00m

£654

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 22/9

07:55-21:23

2 stops19h 28m

Lambert-St Louis

Tue 6/10

15:33-14:25

1 stop16h 52m

£662

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 27/9

21:45-21:23

2 stops29h 38m

Lambert-St Louis

Sun 4/10

20:07-06:50

1 stop28h 43m

£670

LondonSt. Louis

LCY - STL

LCYSTL

London City

Sun 1/11

17:50-15:58

2 stops28h 08m

Lambert-St Louis

Wed 11/11

11:51-07:15

2 stops13h 24m

£683

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 1/11

11:45-23:18

2 stops17h 33m

Lambert-St Louis

Wed 11/11

11:51-06:55

2 stops13h 04m

£684

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 26/6

14:00-23:49

1 stop15h 49m

Lambert-St Louis

Sun 12/7

18:33-10:00

2 stops33h 27m

£699

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Wed 1/7

14:00-23:49

1 stop15h 49m

Lambert-St Louis

Wed 8/7

16:09-10:00

1 stop35h 51m

£707

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 17/6

08:40-20:39

2 stops17h 59m

Lambert-St Louis

Tue 23/6

13:59-13:05

2 stops17h 06m

£769

Flights are sorted by cheapest return flights first.

Deals found on 4/5

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?

To ensure you get the cheapest price possible for a flight from London to St. Louis, you should look to book at least 46 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, August is the cheapest month in which you can book a flight from London to St. Louis (average of £85). Flying from London to St. Louis in November is currently the most expensive (average of £484). 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 5 May 2026.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London to St. Louis as you normally would.

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 53% 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 £370.

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 5 May 2026.
See what other customers who have flown with Finnair,United Airlines, andVirgin Atlantic 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
7.6
Good
1,392 reviews
Check prices

Overall

7.6

Entertainment

6.9

Food

6.7

Comfort

7.4

Crew

8.2

Boarding

7.7

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
7.6
Good
1,392 reviews
Finnair
7.6
Good
1,392 reviews
Check prices

Overall

7.6

Entertainment

6.9

Food

6.7

Comfort

7.4

Crew

8.2

Boarding

7.7

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
9,683 reviews
Finnair
7.6
Good
1,392 reviews
Check prices

Overall

7.6

Entertainment

6.9

Food

6.7

Comfort

7.4

Crew

8.2

Boarding

7.7

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
7.4
Good
688 reviews
Finnair
7.6
Good
1,392 reviews
Check prices

Overall

7.6

Entertainment

6.9

Food

6.7

Comfort

7.4

Crew

8.2

Boarding

7.7

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
10,999 reviews
Finnair
7.6
Good
1,392 reviews
Check prices

Overall

7.6

Entertainment

6.9

Food

6.7

Comfort

7.4

Crew

8.2

Boarding

7.7

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
7,944 reviews
Finnair
7.6
Good
1,392 reviews
Check prices

Overall

7.6

Entertainment

6.9

Food

6.7

Comfort

7.4

Crew

8.2

Boarding

7.7

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 2 inbound flights from London per day. You should also have plenty of airline options to choose from since 11 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 £654, Finnair can have you in St. Louis from London in 16h 15m. 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 £197 on this airline. Additional options worth looking into are Aer Lingus and United Airlines, starting at £364 and £468 round-trip. These flights start at 73% 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 £339. United Airlines flights start at £354 while deals on Finnair start at £358 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 most reliable airlines from London to St. Louis?

    Consider American Airlines (100%), Aer Lingus (100%) or Finnair (100%) 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 £643. On average you can expect to pay £941. The most popular route, (London Heathrow - Lambert-St Louis), can usually be booked for £628.

  • 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 £42 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, August is the cheapest month in which you can book a flight from London to St. Louis (average of £85). Flying from London to St. Louis in November is currently the most expensive (average of £484). 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 5 May 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 10 airlines flying from London to St. Louis

Discover the top 10 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 5 May 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£197Average£726FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Aer LingusCheapest£364Average£719FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
United AirlinesCheapest£468Average£726FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£473Average£729FlexibilityNo cancel feeOn-time70%
Search British Airways flights
KLMCheapest£514Average£743FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£549Average£763FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
FinnairCheapest£580Average£703FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Scandinavian AirlinesCheapest£589Average£696FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
Air CanadaCheapest£596Average£710FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapest£645Average£793FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights

Fly with Cheapflights

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How does Cheapflights help users find flights from London to St. Louis?

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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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