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£263+ 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
18 Mar — 25 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 16 February 2026.

Mon 9/314:00
LGW
-
STL
2 stops34h 11m
Multiple Airlines
Mon 23/307:47
STL
-
LGW
1 stop21h 13m
Multiple Airlines
Deal found 12/2£451
Fri 13/314:00
LGW
-
STL
1 stop14h 19m
Multiple Airlines
Fri 20/312:16
STL
-
LGW
2 stops40h 49m
Multiple Airlines
Deal found 12/2£469
Wed 8/414:00
LGW
-
STL
1 stop15h 25m
Multiple Airlines
Wed 15/420:13
STL
-
LGW
2 stops52h 07m
Multiple Airlines
Deal found 15/2£508
Tue 1/916:25
LHR
-
STL
Nonstop9h 05m
Finnair
Tue 22/916:14
STL
-
LHR
1 stop16h 11m
Finnair
Deal found 14/2£533
Mon 20/406:15
LHR
-
STL
2 stops19h 14m
British Airways
Thu 30/407:05
STL
-
LHR
1 stop18h 35m
British Airways
Deal found 14/2£547
Mon 16/310:00
LHR
-
STL
2 stops18h 58m
Delta
Mon 23/313:39
STL
-
LHR
2 stops15h 36m
Delta
Deal found 14/2£550
Mon 16/311:45
LHR
-
STL
2 stops17h 13m
Delta
Mon 30/306:29
STL
-
LHR
1 stop24h 36m
Delta
Deal found 12/2£551
Mon 16/311:15
LHR
-
STL
1 stop17h 43m
Finnair
Mon 23/311:22
STL
-
LHR
1 stop19h 43m
Finnair
Deal found 14/2£552
Mon 16/311:15
LHR
-
STL
1 stop17h 43m
Finnair
Mon 30/311:22
STL
-
LHR
1 stop15h 38m
Finnair
Deal found 12/2£557
Sun 15/316:35
LHR
-
STL
2 stops35h 27m
British Airways
Sun 22/318:57
STL
-
LHR
1 stop31h 23m
British Airways
Deal found 15/2£558
Mon 20/406:30
LHR
-
STL
2 stops13h 59m
Delta
Thu 30/413:02
STL
-
LHR
1 stop12h 13m
Delta
Deal found 14/2£561
Sun 15/319:20
LHR
-
STL
2 stops33h 38m
Virgin Atlantic
Sun 22/318:59
STL
-
LHR
1 stop30h 26m
Virgin Atlantic
Deal found 13/2£564

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 16 February 2026.

Return from

£451

One-way from

£263

Popular in

July

Cheapest in

March

Average price

£639
9/3-23/3
  • 9/3-23/3
  • 3 total stops
  • 55h 24m total
  • London to St. Louis
Search Deals
12/3
  • 12/3
  • 1 total stop
  • 14h 19m total
  • London to St. Charles
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£96 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£14 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 16 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

Mon 9/3

14:00-19:11

2 stops34h 11m

Lambert-St Louis

Mon 23/3

07:47-10:00

1 stop21h 13m

£451

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Fri 13/3

14:00-23:19

1 stop14h 19m

Lambert-St Louis

Fri 20/3

12:16-10:05

2 stops40h 49m

£469

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 20/4

06:15-19:29

2 stops19h 14m

Lambert-St Louis

Thu 30/4

07:05-07:40

1 stop18h 35m

£547

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 16/3

10:00-23:58

2 stops18h 58m

Lambert-St Louis

Mon 23/3

12:04-11:40

1 stop18h 36m

£550

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 16/3

11:45-23:58

2 stops17h 13m

Lambert-St Louis

Mon 30/3

10:12-07:10

2 stops14h 58m

£551

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 16/3

11:15-23:58

1 stop17h 43m

Lambert-St Louis

Mon 23/3

11:22-12:05

1 stop19h 43m

£552

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 15/3

16:35-23:02

2 stops35h 27m

Lambert-St Louis

Sun 22/3

18:57-07:20

1 stop31h 23m

£558

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 20/4

10:45-23:13

2 stops18h 28m

Lambert-St Louis

Thu 30/4

10:50-06:45

2 stops13h 55m

£574

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 30/4

10:30-21:23

2 stops16h 53m

Lambert-St Louis

Thu 7/5

11:25-08:00

2 stops14h 35m

£577

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 30/4

21:50-19:29

2 stops27h 39m

Lambert-St Louis

Thu 7/5

11:45-08:00

1 stop14h 15m

£577

Flights are sorted by cheapest return flights first.

Deals found on 12/2

Showing 1-10 of 60 results
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2
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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 13 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 15 hours 47 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 £470
Finnair
Finnair
From £477
Virgin Atlantic
Virgin Atlantic
From £479
United Airlines
United Airlines
From £464

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 16 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
1,362 reviews
Check prices

Food

6.7

Comfort

7.4

Overall

7.6

Entertainment

6.9

Crew

8.2

Boarding

7.7

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
1,362 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Comfort

7.4

Overall

7.6

Entertainment

6.9

Crew

8.2

Boarding

7.7

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
9,303 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Comfort

7.4

Overall

7.6

Entertainment

6.9

Crew

8.2

Boarding

7.7

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
10,724 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Comfort

7.4

Overall

7.6

Entertainment

6.9

Crew

8.2

Boarding

7.7

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
3,116 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Comfort

7.4

Overall

7.6

Entertainment

6.9

Crew

8.2

Boarding

7.7

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
7,750 reviews
Finnair
7.6
Good
1,362 reviews
Check prices

Food

6.7

Comfort

7.4

Overall

7.6

Entertainment

6.9

Crew

8.2

Boarding

7.7

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 £256, however they can be found for as little as £256.

  • 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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