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£294+ 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 12/3. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
24 Mar — 31 Mar1
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 22 February 2026.

Mon 13/414:45
LHR
-
STL
1 stop13h 32m
Finnair
Mon 27/416:30
STL
-
LHR
1 stop12h 00m
Finnair
Deal found 20/2£515
Mon 20/408:55
LHR
-
STL
1 stop14h 26m
Finnair
Thu 30/408:54
STL
-
LHR
2 stops15h 31m
Finnair
Deal found 20/2£515
Sun 12/418:10
LHR
-
STL
2 stops34h 07m
Finnair
Mon 20/417:21
STL
-
LHR
1 stop11h 09m
Finnair
Deal found 21/2£540
Thu 30/411:00
LHR
-
STL
2 stops18h 46m
Finnair
Thu 7/511:25
STL
-
LHR
2 stops14h 35m
Finnair
Deal found 19/2£544
Wed 6/516:55
LHR
-
STL
1 stop21h 35m
Finnair
Wed 13/509:34
STL
-
LHR
2 stops14h 51m
Finnair
Deal found 18/2£545
Mon 20/406:15
LHR
-
STL
2 stops19h 14m
British Airways
Thu 30/413:29
STL
-
LHR
1 stop12h 21m
British Airways
Deal found 18/2£552
Wed 8/414:00
LGW
-
STL
1 stop15h 25m
Multiple Airlines
Wed 6/520:13
STL
-
LGW
2 stops28h 07m
Multiple Airlines
Deal found 19/2£562
Wed 8/414:00
LGW
-
STL
1 stop15h 25m
Multiple Airlines
Fri 8/520:12
STL
-
LGW
2 stops31h 48m
Multiple Airlines
Deal found 19/2£596
Mon 27/414:00
LGW
-
STL
1 stop15h 19m
Multiple Airlines
Wed 29/420:23
STL
-
LGW
2 stops27h 57m
Multiple Airlines
Deal found 21/2£597
Mon 27/414:00
LGW
-
STL
1 stop15h 19m
Multiple Airlines
Mon 4/520:23
STL
-
LGW
2 stops27h 57m
Multiple Airlines
Deal found 21/2£605
Wed 8/414:00
LGW
-
STL
1 stop15h 25m
Multiple Airlines
Sat 9/520:12
STL
-
LGW
2 stops31h 48m
Multiple Airlines
Deal found 19/2£613
Sat 25/414:00
LGW
-
STL
1 stop15h 19m
Multiple Airlines
Wed 29/420:23
STL
-
LGW
2 stops27h 57m
Multiple Airlines
Deal found 21/2£616

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 22 February 2026.

Return from

£515

One-way from

£283

Popular in

July

Cheapest in

March

Average price

£648
Finnair
  • Finnair
  • 13/4-27/4
  • 2 total stops
  • 25h 32m total
  • London to St. Louis
Search Deals
5/5
  • 5/5
  • 3 total stops
  • 55h 20m total
  • London to St. Charles
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£97 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£15 potential savings vs. average return price).
Search Deals
Average for return flights in February 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 22 February 2026.
Use the filters below to find and compare flights to St. Charles that are best for you.

Fly from

London

Route

Depart

Return

Price

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 13/4

08:40-20:44

2 stops18h 04m

Lambert-St Louis

Mon 27/4

11:42-07:10

2 stops13h 28m

£562

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 8/5

06:30-16:49

2 stops16h 19m

Lambert-St Louis

Sun 10/5

16:26-14:35

1 stop16h 09m

£596

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 8/4

08:55-17:21

1 stop14h 26m

Lambert-St Louis

Tue 5/5

20:03-12:15

1 stop10h 12m

£622

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 31/3

09:20-16:16

1 stop12h 56m

Lambert-St Louis

Tue 28/4

11:42-11:20

1 stop17h 38m

£624

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Wed 8/4

14:00-23:25

1 stop15h 25m

Lambert-St Louis

Sun 19/4

15:30-19:25

2 stops21h 55m

£670

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 16/6

20:15-23:34

2 stops33h 19m

Lambert-St Louis

Tue 7/7

07:15-10:30

1 stop21h 15m

£675

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 16/6

09:45-20:30

1 stop16h 45m

Lambert-St Louis

Wed 8/7

19:49-18:55

1 stop17h 06m

£682

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 17/6

12:30-23:34

1 stop17h 04m

Lambert-St Louis

Mon 6/7

06:00-08:05

1 stop20h 05m

£682

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 14/7

20:10-19:19

1 stop29h 09m

Lambert-St Louis

Tue 21/7

19:50-12:15

1 stop10h 25m

£682

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 7/4

06:30-17:05

2 stops16h 35m

Lambert-St Louis

Tue 14/4

10:50-07:10

1 stop14h 20m

£682

Flights are sorted by cheapest return flights first.

Deals found on 19/2

Showing 1-10 of 60 results
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2
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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 20 February 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 7 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, Finnair and Lufthansa.

British Airways
British Airways
From £476
Virgin Atlantic
Virgin Atlantic
From £485
Finnair
Finnair
From £484
United Airlines
United Airlines
From £470

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 22 February 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
7.6
Good
1,365 reviews
Check prices

Boarding

7.7

Comfort

7.4

Overall

7.6

Crew

8.2

Food

6.7

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
1,365 reviews
Finnair
7.6
Good
1,365 reviews
Check prices

Boarding

7.7

Comfort

7.4

Overall

7.6

Crew

8.2

Food

6.7

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
679 reviews
Finnair
7.6
Good
1,365 reviews
Check prices

Boarding

7.7

Comfort

7.4

Overall

7.6

Crew

8.2

Food

6.7

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
9,339 reviews
Finnair
7.6
Good
1,365 reviews
Check prices

Boarding

7.7

Comfort

7.4

Overall

7.6

Crew

8.2

Food

6.7

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
10,738 reviews
Finnair
7.6
Good
1,365 reviews
Check prices

Boarding

7.7

Comfort

7.4

Overall

7.6

Crew

8.2

Food

6.7

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
7,757 reviews
Finnair
7.6
Good
1,365 reviews
Check prices

Boarding

7.7

Comfort

7.4

Overall

7.6

Crew

8.2

Food

6.7

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.

  • 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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