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£285+ 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 31/3. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
7 Mar — 14 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 5 February 2026.

Thu 12/314:00
LGW
-
STL
1 stop14h 19m
Multiple Airlines
Thu 19/308:02
STL
-
LGW
1 stop20h 58m
Multiple Airlines
Deal found 2/2£437
Mon 9/306:30
LHR
-
STL
2 stops21h 55m
Virgin Atlantic
Mon 23/312:04
STL
-
LHR
1 stop13h 21m
Virgin Atlantic
Deal found 4/2£499
Mon 2/311:30
LHR
-
STL
2 stops18h 06m
Virgin Atlantic
Mon 16/313:39
STL
-
LHR
2 stops15h 36m
Virgin Atlantic
Deal found 1/2£501
Tue 3/309:55
LHR
-
STL
1 stop13h 03m
British Airways
Tue 10/318:08
STL
-
LHR
1 stop12h 32m
British Airways
Deal found 2/2£532
Wed 4/311:05
LHR
-
STL
1 stop11h 40m
Virgin Atlantic
Sun 8/318:59
STL
-
LHR
1 stop30h 26m
Virgin Atlantic
Deal found 3/2£539
Tue 3/311:05
LHR
-
STL
1 stop11h 40m
Virgin Atlantic
Tue 10/317:59
STL
-
LHR
1 stop9h 46m
Virgin Atlantic
Deal found 2/2£540
Wed 4/315:35
LHR
-
STL
2 stops25h 54m
Finnair
Sun 8/318:50
STL
-
LHR
1 stop31h 00m
Finnair
Deal found 3/2£540
Wed 6/514:45
LHR
-
STL
1 stop13h 32m
Finnair
Tue 19/511:45
STL
-
LHR
1 stop14h 15m
Finnair
Deal found 4/2£547
Mon 9/314:00
LGW
-
STL
1 stop14h 19m
Multiple Airlines
Mon 23/320:10
STL
-
LGW
1 stop32h 50m
Multiple Airlines
Deal found 4/2£554
Fri 13/314:00
LGW
-
STL
1 stop14h 19m
Multiple Airlines
Tue 17/316:51
STL
-
LGW
2 stops32h 09m
Multiple Airlines
Deal found 3/2£607
Thu 12/308:40
LCY
-
STL
2 stops19h 45m
Delta
Thu 19/312:04
STL
-
LCY
2 stops14h 11m
Delta
Deal found 2/2£619
Mon 20/420:45
LGW
-
STL
3 stops24h 39m
Multiple Airlines
Fri 24/415:30
STL
-
LGW
2 stops17h 25m
Multiple Airlines
Deal found 2/2£626

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 5 February 2026.

Return from

£437

One-way from

£285

Popular in

July

Cheapest in

March

Average price

£618
12/3-19/3
  • 12/3-19/3
  • 2 total stops
  • 35h 17m total
  • London to St. Louis
Search Deals
31/3
  • 31/3
  • 3 total stops
  • 46h 40m total
  • London to St. Charles
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£101 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% 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 5 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

LGW - STL

LGWSTL

London Gatwick

Thu 12/3

14:00-23:19

1 stop14h 19m

Lambert-St Louis

Thu 19/3

08:02-10:00

1 stop20h 58m

£437

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/3

11:30-23:36

2 stops18h 06m

Lambert-St Louis

Mon 16/3

18:59-09:00

1 stop33h 01m

£503

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/3

11:45-18:52

1 stop13h 07m

Lambert-St Louis

Wed 11/3

14:29-06:55

1 stop11h 26m

£532

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Mon 9/3

14:00-23:19

1 stop14h 19m

Lambert-St Louis

Mon 23/3

20:10-10:00

1 stop32h 50m

£554

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 6/5

08:40-20:42

2 stops18h 02m

Lambert-St Louis

Tue 19/5

10:15-06:45

2 stops14h 30m

£568

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/3

09:00-17:42

2 stops38h 42m

Lambert-St Louis

Sun 8/3

18:59-10:30

2 stops34h 31m

£571

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 19/3

17:00-17:19

2 stops29h 19m

Lambert-St Louis

Thu 26/3

18:20-12:05

1 stop12h 45m

£571

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 12/3

17:00-17:19

2 stops29h 19m

Lambert-St Louis

Thu 19/3

09:15-09:15

1 stop19h 00m

£571

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 13/3

09:55-18:07

1 stop13h 12m

Lambert-St Louis

Tue 17/3

16:13-11:40

1 stop14h 27m

£580

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 30/4

08:55-17:21

1 stop14h 26m

Lambert-St Louis

Thu 7/5

07:05-06:25

2 stops17h 20m

£582

Flights are sorted by cheapest return flights first.

Deals found on 2/2

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 30 January 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 14 hours 43 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 Finnair, British Airways and Lufthansa.

British Airways
British Airways
From £472
Finnair
Finnair
From £482
Virgin Atlantic
Virgin Atlantic
From £482
United Airlines
United Airlines
From £467

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 5 February 2026.
Read through reviews of airlines serving the United States, such as Finnair, United Airlines, andAir Canada. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,357 reviews
Check prices

Boarding

7.7

Entertainment

6.9

Food

6.7

Comfort

7.5

Overall

7.6

Crew

8.2

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
1,357 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Boarding

7.7

Entertainment

6.9

Food

6.7

Comfort

7.5

Overall

7.6

Crew

8.2

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
9,242 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Boarding

7.7

Entertainment

6.9

Food

6.7

Comfort

7.5

Overall

7.6

Crew

8.2

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
10,696 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Boarding

7.7

Entertainment

6.9

Food

6.7

Comfort

7.5

Overall

7.6

Crew

8.2

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
3,104 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Boarding

7.7

Entertainment

6.9

Food

6.7

Comfort

7.5

Overall

7.6

Crew

8.2

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
7,716 reviews
Finnair
7.6
Good
1,357 reviews
Check prices

Boarding

7.7

Entertainment

6.9

Food

6.7

Comfort

7.5

Overall

7.6

Crew

8.2

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 £258, however they can be found for as little as £258.

  • 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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Not ready to book yet? You can track prices for flights to St. Charles on Cheapflights with our Price Alerts feature and get notified when better prices are available.

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