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£243+ Cheap flights to St. Charles

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.
— STL
17 May — 24 May1
1 adult
1 adult, Economy, 0 bags

Flights to St. Charles in 2026

Enter your travel dates to find the best prices.

Cheapest flights to St. Charles
Explore the most affordable flight options available to St. Charles. Find the lowest fares based on data from user searches, with prices last updated on 17 April 2026.

Tue 5/510:45
LHR
-
STL
1 stop11h 57m
Delta
Sat 23/516:00
STL
-
LHR
1 stop15h 05m
Delta
Deal found 15/4£609
Wed 2/916:25
LHR
-
STL
Nonstop9h 05m
Multiple Airlines
Wed 23/915:33
STL
-
LHR
1 stop15h 17m
Multiple Airlines
Deal found 13/4£610
Wed 2/916:25
LHR
-
STL
Nonstop9h 05m
British Airways
Wed 23/916:47
STL
-
LHR
1 stop10h 38m
British Airways
Deal found 16/4£613
Mon 11/513:25
LHR
-
STL
1 stop16h 34m
Delta
Sun 17/517:34
STL
-
LHR
1 stop13h 31m
Delta
Deal found 15/4£616
Tue 8/910:05
LHR
-
STL
1 stop16h 21m
Multiple Airlines
Tue 22/920:07
STL
-
LHR
1 stop10h 08m
Multiple Airlines
Deal found 14/4£617
Wed 2/907:30
LHR
-
STL
2 stops22h 21m
Finnair
Wed 23/912:43
STL
-
LHR
1 stop14h 22m
Finnair
Deal found 14/4£624
Wed 9/916:25
LHR
-
STL
Nonstop9h 05m
American Airlines
Mon 21/905:40
STL
-
LHR
1 stop18h 40m
American Airlines
Deal found 14/4£627
Thu 4/614:00
LGW
-
STL
1 stop15h 57m
Multiple Airlines
Tue 16/618:31
STL
-
LGW
2 stops33h 29m
Multiple Airlines
Deal found 16/4£631
Fri 1/514:00
LGW
-
STL
1 stop15h 19m
Multiple Airlines
Wed 6/517:27
STL
-
LGW
2 stops30h 53m
Multiple Airlines
Deal found 13/4£653
Fri 1/514:00
LGW
-
STL
1 stop15h 19m
Multiple Airlines
Fri 15/517:27
STL
-
LGW
2 stops30h 53m
Multiple Airlines
Deal found 16/4£669
Thu 4/614:00
LGW
-
STL
1 stop15h 57m
Multiple Airlines
Mon 8/611:38
STL
-
LGW
1 stop16h 22m
Multiple Airlines
Deal found 15/4£669
Tue 16/614:00
LGW
-
STL
1 stop16h 09m
Multiple Airlines
Sun 21/616:17
STL
-
LGW
1 stop35h 43m
Multiple Airlines
Deal found 13/4£671

Find flight deals to St. Charles

Find the latest flights to St. Charles in 2026, with up-to-date prices and availability. In the last 7 days, Cheapflights users made a total of 858,174 searches and data was last updated on 17 April 2026.

Return from

£609

One-way from

£243

Popular in

July

Cheapest in

February

Average price

£683
Delta
  • Delta
  • 5/5-23/5
  • 2 total stops
  • 27h 02m total
  • London to St. Louis
Search Deals
31/5
  • 31/5
  • 1 total stop
  • 26h 29m total
  • London to St. Charles
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£88 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£13 potential savings vs. average return price).
Search Deals
Average for return flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Locate flights to St. Charles that fit your budget, with regularly updated fares and availability. In the last 7 days, Cheapflights users made a total of 858,174 searches and data was last updated on 17 April 2026.
Use the filters below to find and compare flights to St. Charles that are best for you.

Fly from

Route

Depart

Return

Price

Cheapest return flight

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 30/9

06:45-21:23

2 stops20h 38m

Lambert-St Louis

Sun 4/10

20:07-11:15

1 stop33h 08m

£636

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 8/9

15:00-22:40

1 stop13h 40m

Lambert-St Louis

Tue 22/9

16:47-12:10

1 stop13h 23m

£649

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 5/5

06:30-17:44

2 stops17h 14m

Lambert-St Louis

Tue 12/5

17:15-13:15

1 stop14h 00m

£721

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Mon 15/6

14:00-00:09

1 stop16h 09m

Lambert-St Louis

Sun 21/6

16:17-10:00

1 stop35h 43m

£731

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Tue 16/6

14:00-00:09

1 stop16h 09m

Lambert-St Louis

Fri 19/6

20:08-10:00

2 stops31h 52m

£744

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 19/5

06:30-14:31

2 stops14h 01m

Lambert-St Louis

Tue 26/5

09:13-07:10

2 stops15h 57m

£768

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Mon 1/6

10:25-21:09

2 stops16h 44m

Lambert-St Louis

Mon 8/6

10:20-09:40

2 stops17h 20m

£788

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 30/8

19:35-23:23

2 stops33h 48m

Lambert-St Louis

Thu 3/9

06:06-06:50

1 stop18h 44m

£794

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 17/6

06:30-17:23

2 stops16h 53m

Lambert-St Louis

Sun 21/6

13:59-13:05

2 stops17h 06m

£797

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 2/7

09:15-23:32

1 stop20h 17m

Lambert-St Louis

Tue 21/7

17:11-11:15

1 stop12h 04m

£799

Flights are sorted by cheapest return flights first.

Deals found on 14/4

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
...
6

Best time to book a flight to St. Charles

Have a flexible travel schedule? Discover the best time to fly to St. Charles 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 to St. Charles

When is the best time to book a flight to St. Charles?

Use this chart to determine the optimal time to book a return flight from London to St. Charles. Price data was last updated on 10 April 2026.

To ensure you get the cheapest price possible for a flight to St. Charles, 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.

How long is the flight to St. Charles?

On average, a flight from London to St. Charles takes 17 hours 5 minutes. Flights to St. Charles from other popular cities in United Kingdom will vary in length. Below are a few examples of popular routes and their flight times.

What are the most popular airlines that fly to St. Charles?

The most popular airlines flying from London to St. Charles are British Airways, Lufthansa and United Airlines.

British Airways
British Airways
From £473
Virgin Atlantic
Virgin Atlantic
From £505
United Airlines
United Airlines
From £468
Lufthansa
Lufthansa
From £618

What are the cheapest airlines that fly to St. Charles?

The cheapest airlines flying from London to St. Charles are American Airlines, United Airlines and British Airways.

Rainfall in St. Charles by month

Plan your trip to St. Charles by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in St. Charles ranges from 56.0 - 119.0 inches per month. May is typically the wettest month, when rainfall can reach 119.0 mm. February is typically the driest time to visit St. Charles when rainfall is around 56.0 mm.

Temperature in St. Charles by month

Plan your trip to St. Charles by taking into account the average temperature totals by month.

If weather is an important factor for your trip to St. Charles, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 27.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 0.0 C).

Reviews of airlines servicing St. Charles

Get insights into the airlines that provide service to St. Charles. 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. Charles. Reviews last updated 17 April 2026.
Read through reviews of airlines serving the United States, such as Finnair,Virgin Atlantic, andUnited Airlines. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.7
Good
1,389 reviews
Check prices

Comfort

7.4

Crew

8.2

Food

6.7

Overall

7.7

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
7.7
Good
1,389 reviews
Finnair
7.7
Good
1,389 reviews
Check prices

Comfort

7.4

Crew

8.2

Food

6.7

Overall

7.7

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
Virgin Atlantic
7.5
Good
687 reviews
Finnair
7.7
Good
1,389 reviews
Check prices

Comfort

7.4

Crew

8.2

Food

6.7

Overall

7.7

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
9,604 reviews
Finnair
7.7
Good
1,389 reviews
Check prices

Comfort

7.4

Crew

8.2

Food

6.7

Overall

7.7

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
10,934 reviews
Finnair
7.7
Good
1,389 reviews
Check prices

Comfort

7.4

Crew

8.2

Food

6.7

Overall

7.7

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
7,891 reviews
Finnair
7.7
Good
1,389 reviews
Check prices

Comfort

7.4

Crew

8.2

Food

6.7

Overall

7.7

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

FAQs about flying to St. Charles

  • Can I find cheaper flights to St. Charles if I am willing to have stopovers?

    Yes, flights with stopovers are often cheaper than direct flights. Keep an eye out for flight deals to St. Charles on Cheapflights that require 1 or 2 stops for potential cost savings.

  • What is the best airline to fly to St. Charles?

    Based on reviews from Cheapflights users, American Airlines is rated the highest out of the airlines that fly to St. Charles.

  • How much is a return flight to St. Charles?

    A return flight to St. Charles will typically cost around £208, however they can be found for as little as £208.

  • Where does the fastest flight to St. Charles depart from?

    For those looking to save time traveling to St. Charles, London offers the quickest one-way flight (9 hours 5 minutes).

  • Does Lambert-St Louis have car hire?

    Yes. Those touching down at Lambert-St Louis can take advantage of the car hire services offered upon their arrival.

  • Are there hotels close to Lambert-St Louis?

    Yes. Lambert-St Louis has hotels nearby for those requiring accommodations. Hampton Inn St. Louis-Airport is the closest property to Lambert-St Louis (0.0 mi away from Lambert-St Louis).

See more FAQs

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Why should you use Cheapflights to find cheap flight tickets to St. Charles?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to St. Charles.

Can Cheapflights find flights to St. Charles with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights to St. Charles, users can toggle the no change fees filter when performing a flight search.

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