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Cheap flights from London to St. Louis from £253

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 23/2. Fares are subject to change and may not be available on all flights or dates of travel.
LON — STL
27 Feb — 6 Mar1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London to Lambert-St Louis are usually found in March or January, booked 48 days in advance, depart on a Thursday or Friday and return on a Monday

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 28 January 2026.

Sun 1/306:30
LHR
-
STL
1 stop13h 25m
Lufthansa
Mon 9/317:41
STL
-
LHR
1 stop11h 44m
Lufthansa
Deal found 27/1£422
Fri 13/306:30
LHR
-
STL
1 stop13h 25m
Lufthansa
Tue 17/313:14
STL
-
LHR
1 stop11h 41m
Lufthansa
Deal found 25/1£432
Mon 9/312:05
LHR
-
STL
2 stops56h 24m
Multiple Airlines
Mon 16/319:00
STL
-
LHR
1 stop11h 15m
Multiple Airlines
Deal found 25/1£434
Mon 2/213:45
LHR
-
STL
2 stops55h 30m
Multiple Airlines
Mon 2/318:55
STL
-
LHR
1 stop10h 20m
Multiple Airlines
Deal found 26/1£437
Tue 24/209:00
LHR
-
STL
2 stops16h 14m
United Airlines
Tue 3/309:55
STL
-
LHR
2 stops14h 45m
United Airlines
Deal found 27/1£440
Sun 1/306:30
LHR
-
STL
1 stop13h 25m
United Airlines
Mon 9/311:25
STL
-
LHR
2 stops16h 00m
United Airlines
Deal found 27/1£441
Sun 1/306:30
LHR
-
STL
1 stop13h 25m
Lufthansa
Sat 14/319:00
STL
-
LHR
1 stop29h 55m
Lufthansa
Deal found 26/1£443
Wed 11/311:10
LHR
-
STL
2 stops16h 49m
United Airlines
Wed 18/311:25
STL
-
LHR
2 stops16h 00m
United Airlines
Deal found 25/1£444
Sun 1/207:30
LHR
-
STL
2 stops17h 57m
United Airlines
Sat 7/213:15
STL
-
LHR
1 stop12h 40m
United Airlines
Deal found 25/1£446
Thu 5/206:50
LHR
-
STL
2 stops15h 13m
United Airlines
Mon 9/209:57
STL
-
LHR
1 stop13h 58m
United Airlines
Deal found 26/1£446
Fri 17/406:30
LHR
-
STL
1 stop12h 55m
Lufthansa
Tue 21/418:35
STL
-
LHR
1 stop11h 10m
Lufthansa
Deal found 27/1£447
Thu 12/314:00
LGW
-
STL
1 stop22h 22m
Multiple Airlines
Thu 19/308:02
STL
-
LGW
1 stop20h 58m
Multiple Airlines
Deal found 26/1£472

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 28 January 2026.

Round-trip from

£422

One-way from

£253

Popular in

July

Cheapest in

March

Average price

£548

Good round-trip deal

£566 or less
Lufthansa
  • Lufthansa
  • 1/3-9/3
  • 2 total stops
  • 25h 09m total
  • London to St. Louis
Search Deals
23/2
  • 23/2
  • 2 total stops
  • 46h 51m total
  • London to St. Louis
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£72 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£11 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 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 28 January 2026.
Use the filters below to find and compare flights from London to St. Louis that are best for you.

Fly from

London

Fly to

St. Louis

Route

Depart

Return

Price

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 24/2

09:00-19:14

2 stops16h 14m

Lambert-St Louis

Tue 3/3

12:15-09:10

2 stops14h 55m

£440

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 5/3

09:00-21:42

2 stops18h 42m

Lambert-St Louis

Sat 14/3

07:41-05:55

1 stop17h 14m

£440

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 17/4

06:30-13:25

1 stop12h 55m

Lambert-St Louis

Tue 21/4

13:10-06:45

1 stop11h 35m

£441

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 1/3

06:30-13:55

1 stop13h 25m

Lambert-St Louis

Sun 15/3

19:00-11:15

1 stop11h 15m

£441

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 11/3

06:30-14:55

1 stop13h 25m

Lambert-St Louis

Wed 18/3

17:41-11:05

1 stop12h 24m

£441

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 13/3

06:30-14:55

1 stop13h 25m

Lambert-St Louis

Tue 17/3

11:25-06:40

2 stops14h 15m

£441

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 1/3

06:30-13:55

1 stop13h 25m

Lambert-St Louis

Mon 9/3

11:25-08:25

2 stops16h 00m

£441

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 12/3

06:30-17:59

2 stops16h 29m

Lambert-St Louis

Thu 19/3

08:30-06:40

1 stop17h 10m

£446

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 19/3

08:30-21:07

2 stops17h 37m

Lambert-St Louis

Tue 31/3

11:15-06:45

1 stop13h 30m

£446

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 18/3

06:30-17:59

2 stops16h 29m

Lambert-St Louis

Tue 31/3

13:10-11:45

1 stop16h 35m

£446

Flights are sorted by cheapest return flights first.

Deals found on 26/1

Showing 1-10 of 60 results
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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 23 January 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 £395). Flying from London to St. Louis in July is currently the most expensive (average of £593). 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 59% 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 £366.

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 28 January 2026.
See what other customers who have flown with Finnair, 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.
Finnair
7.6
Good
1,356 reviews
Check prices

Overall

7.6

Comfort

7.5

Crew

8.2

Food

6.7

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Finnair
7.6
Good
1,356 reviews
Finnair
7.6
Good
1,356 reviews
Check prices

Overall

7.6

Comfort

7.5

Crew

8.2

Food

6.7

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
United Airlines
7.4
Good
9,214 reviews
Finnair
7.6
Good
1,356 reviews
Check prices

Overall

7.6

Comfort

7.5

Crew

8.2

Food

6.7

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Air Canada
7.1
Good
10,666 reviews
Finnair
7.6
Good
1,356 reviews
Check prices

Overall

7.6

Comfort

7.5

Crew

8.2

Food

6.7

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
Iberia
7.0
Good
3,099 reviews
Finnair
7.6
Good
1,356 reviews
Check prices

Overall

7.6

Comfort

7.5

Crew

8.2

Food

6.7

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights
British Airways
6.7
Okay
7,705 reviews
Finnair
7.6
Good
1,356 reviews
Check prices

Overall

7.6

Comfort

7.5

Crew

8.2

Food

6.7

Boarding

7.7

Entertainment

6.9

Reviews

1 / 20
2.0
Mediocre

Vlad-Valentin,Jan 2026

LHR - YVR

baggage allowance was different between the outgoing and inbound flights

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 £440, United Airlines can have you in St. Louis from London in 16h 14m. 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 £167 on this airline. Additional options worth looking into are United Airlines and British Airways, starting at £462 and £467 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 £335. Finnair flights start at £353 while deals on Virgin Atlantic start at £500 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 City - 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 £470. On average you can expect to pay £710. The most popular route, (London Heathrow - Lambert-St Louis), can usually be booked for £422.

  • 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 £37 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 £395). Flying from London to St. Louis in July is currently the most expensive (average of £593). 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

Browse thousands of different options on Cheapflights for your next trip

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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 28 January 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 28 January 2026.
AirlineCheapestAverageFlexibilityOn-time
American AirlinesCheapest£167Average£748FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
United AirlinesCheapest£462Average£726FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£467Average£747FlexibilityNo cancel feeOn-time70%
Search British Airways flights
FinnairCheapest£483Average£674FlexibilityNo cancel feeOn-time76%
Search Finnair flights
KLMCheapest£491Average£837FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£542Average£834FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
Air CanadaCheapest£589Average£726FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
IberiaCheapest£631Average£711FlexibilityNo cancel feeOn-time77%
Search Iberia flights
LufthansaCheapest£644Average£782FlexibilityNo 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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