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Cheap flights from London to St. Louis from £340

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 10/10. Fares are subject to change and may not be available on all flights or dates of travel.
LON — STL
19 Jul — 26 Jul1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London to Lambert-St Louis are usually found in February or March, booked 79 days in advance, depart on a Friday 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 19 June 2026.

Mon 9/1107:05
LHR
-
STL
3 stops22h 34m
Scandinavian Airlines
Fri 13/1116:40
STL
-
LHR
2 stops19h 50m
Scandinavian Airlines
Deal found 17/6£748
Tue 1/914:00
LGW
-
STL
1 stop16h 14m
Multiple Airlines
Sat 31/1006:00
STL
-
LGW
2 stops23h 55m
Multiple Airlines
Deal found 17/6£751
Wed 8/714:00
LGW
-
STL
1 stop15h 59m
Multiple Airlines
Tue 14/716:09
STL
-
LGW
1 stop35h 51m
Multiple Airlines
Deal found 19/6£751
Wed 23/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Sat 3/1013:25
STL
-
LHR
1 stop12h 25m
British Airways
Deal found 17/6£754
Fri 26/609:15
LHR
-
STL
1 stop14h 04m
Iberia
Sat 27/620:14
STL
-
LHR
1 stop29h 51m
Iberia
Deal found 17/6£754
Fri 26/609:15
LHR
-
STL
2 stops15h 45m
Multiple Airlines
Sat 27/620:14
STL
-
LHR
1 stop29h 51m
Multiple Airlines
Deal found 17/6£755
Sat 21/1119:40
LGW
-
STL
2 stops19h 18m
Iberia
Sat 28/1107:00
STL
-
LGW
2 stops30h 00m
Iberia
Deal found 19/6£755
Wed 7/1019:30
LHR
-
STL
2 stops31h 19m
Scandinavian Airlines
Tue 13/1015:42
STL
-
LHR
2 stops18h 18m
Scandinavian Airlines
Deal found 16/6£757
Fri 3/709:15
LHR
-
STL
1 stop14h 06m
British Airways
Sun 19/721:40
STL
-
LHR
Nonstop8h 00m
British Airways
Deal found 18/6£758
Tue 25/811:30
LGW
-
STL
2 stops37h 57m
Iberia
Tue 8/913:25
STL
-
LGW
2 stops24h 35m
Iberia
Deal found 17/6£760
Fri 28/806:20
LTN
-
STL
2 stops20h 02m
Multiple Airlines
Mon 7/912:10
STL
-
LTN
2 stops21h 35m
Multiple Airlines
Deal found 18/6£761
Tue 14/712:15
LHR
-
STL
1 stop18h 01m
Finnair
Tue 21/721:35
STL
-
LHR
Nonstop8h 00m
Finnair
Deal found 16/6£765

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 19 June 2026.

Round-trip from

£748

One-way from

£340

Popular in

July

Cheapest in

February

Average price

£850

Good round-trip deal

£834 or less

Good one-way deal

£705 or less
Scandinavian Airlines
  • Scandinavian Airlines
  • 9/11-13/11
  • 5 total stops
  • 42h 24m total
  • London to St. Louis
Search Deals
10/10
  • 10/10
  • 2 total stops
  • 25h 40m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (£95 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£14 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 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 19 June 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

Wed 8/7

14:00-23:59

1 stop15h 59m

Lambert-St Louis

Tue 14/7

16:09-10:00

1 stop35h 51m

£751

LondonSt. Louis

LTN - STL

LTNSTL

London Luton

Fri 28/8

06:20-20:22

2 stops20h 02m

Lambert-St Louis

Mon 7/9

12:10-15:45

2 stops21h 35m

£761

LondonSt. Louis

LCY - STL

LCYSTL

London City

Tue 1/9

09:20-20:42

2 stops17h 22m

Lambert-St Louis

Sat 31/10

17:45-13:15

2 stops14h 30m

£782

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Mon 9/11

19:40-23:56

2 stops34h 16m

Lambert-St Louis

Fri 13/11

13:20-10:50

2 stops39h 30m

£810

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 28/8

12:40-20:22

1 stop13h 42m

Lambert-St Louis

Mon 7/9

08:55-10:45

1 stop19h 50m

£840

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 24/7

14:00-23:59

1 stop15h 59m

Lambert-St Louis

Fri 7/8

16:09-10:00

1 stop35h 51m

£843

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 6/7

15:00-23:57

1 stop14h 57m

Lambert-St Louis

Sun 12/7

21:40-11:40

Nonstop8h 00m

£846

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 29/7

07:30-18:13

2 stops16h 43m

Lambert-St Louis

Wed 5/8

13:13-09:20

2 stops14h 07m

£850

LondonSt. Louis

LTN - STL

LTNSTL

London Luton

Tue 30/6

06:00-23:29

3 stops23h 29m

Lambert-St Louis

Fri 17/7

08:55-22:40

3 stops31h 45m

£853

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 27/7

12:15-19:26

1 stop13h 11m

Lambert-St Louis

Wed 5/8

13:13-06:45

1 stop11h 32m

£873

Flights are sorted by cheapest return flights first.

Deals found on 15/6

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

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 £69). Flying from London to St. Louis in June is currently the most expensive (average of £582). 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 19 June 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 48% 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 £379.

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.

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

About 0% of weekly flights between London and St. Louis have experienced delays in the past year, with the average delay time being 0 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?

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

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 83 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.

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 19 June 2026.
See what other customers who have flown with Virgin Atlantic,United Airlines, andAir Canada 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.
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Comfort

7.3

Food

6.9

Overall

7.5

Crew

8.1

Entertainment

7.5

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Virgin Atlantic
7.5
Good
690 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Comfort

7.3

Food

6.9

Overall

7.5

Crew

8.1

Entertainment

7.5

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
United Airlines
7.4
Good
9,860 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Comfort

7.3

Food

6.9

Overall

7.5

Crew

8.1

Entertainment

7.5

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Air Canada
7.1
Good
11,220 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Comfort

7.3

Food

6.9

Overall

7.5

Crew

8.1

Entertainment

7.5

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
Lufthansa
6.8
Okay
8,075 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Comfort

7.3

Food

6.9

Overall

7.5

Crew

8.1

Entertainment

7.5

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would be.
British Airways
6.7
Okay
8,054 reviews
Virgin Atlantic
7.5
Good
690 reviews
Check prices

Comfort

7.3

Food

6.9

Overall

7.5

Crew

8.1

Entertainment

7.5

Boarding

7.7

Reviews

1 / 20
10.0
Excellent

Edwin,May 2026

LHR - LAX

First time flying with Virgin. It was everything I hoped it would 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?

    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 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 £846, Delta can have you in St. Louis from London in 14h 57m. 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 £176 on this airline. Additional options worth looking into are Aer Lingus and British Airways, starting at £372 and £484 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 £347. United Airlines flights start at £362 while deals on Lufthansa start at £465 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 (79%), Aer Lingus (79%) or Finnair (79%) 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 £459. On average you can expect to pay £849. The most popular route, (London Heathrow - Lambert-St Louis), can usually be booked for £541.

  • 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 £69). Flying from London to St. Louis in June is currently the most expensive (average of £582). 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 19 June 2026.
British Airways flights from London to Lambert-St Louis
Virgin Atlantic flights from London to Lambert-St Louis
Finnair 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 19 June 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£176Average£727FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Aer LingusCheapest£372Average£736FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£484Average£770FlexibilityNo cancel feeOn-time70%
Search British Airways flights
United AirlinesCheapest£494Average£745FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
KLMCheapest£509Average£760FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£562Average£782FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
FinnairCheapest£567Average£716FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Air CanadaCheapest£580Average£716FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapest£649Average£811FlexibilityNo 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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