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£235+ 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 6/2. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
2 Feb — 9 Feb1
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 3 January 2026.

Fri 30/114:00LGW - STL
1 stop15h 33mMultiple Airlines
Fri 6/211:18STL - LGW
1 stop16h 42mMultiple Airlines
Deal found 2/1£345
Fri 30/106:30LHR - STL
1 stop13h 25mLufthansa
Fri 6/211:22STL - LHR
1 stop12h 58mLufthansa
Deal found 2/1£432
Fri 30/106:30LHR - STL
1 stop13h 25mMultiple Airlines
Fri 6/211:22STL - LHR
1 stop15h 03mMultiple Airlines
Deal found 2/1£434
Thu 29/109:00LHR - STL
2 stops18h 13mUnited Airlines
Thu 5/213:15STL - LHR
1 stop10h 40mUnited Airlines
Deal found 1/1£443
Wed 18/306:30LHR - STL
1 stop13h 25mUnited Airlines
Thu 26/306:00STL - LHR
1 stop20h 30mUnited Airlines
Deal found 2/1£444
Mon 16/217:10LHR - STL
2 stops52h 19mMultiple Airlines
Mon 23/213:11STL - LHR
1 stop16h 04mMultiple Airlines
Deal found 2/1£446
Fri 30/108:30LHR - STL
2 stops16h 57mUnited Airlines
Fri 6/213:15STL - LHR
2 stops15h 10mUnited Airlines
Deal found 2/1£449
Thu 5/206:50LHR - STL
2 stops15h 13mUnited Airlines
Mon 9/213:15STL - LHR
1 stop10h 40mUnited Airlines
Deal found 1/1£449
Thu 19/308:30LHR - STL
2 stops18h 12mUnited Airlines
Thu 26/307:41STL - LHR
2 stops18h 29mUnited Airlines
Deal found 2/1£451
Wed 18/306:15LHR - STL
2 stops19h 56mBritish Airways
Thu 26/311:59STL - LHR
1 stop14h 01mBritish Airways
Deal found 2/1£451
Mon 16/212:35LHR - STL
1 stop14h 37mBritish Airways
Mon 23/218:18STL - LHR
1 stop11h 57mBritish Airways
Deal found 2/1£454
Sun 15/210:25LHR - STL
1 stop13h 19mLufthansa
Sun 22/218:55STL - LHR
1 stop10h 20mLufthansa
Deal found 1/1£454

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 3 January 2026.

Return from

£345

One-way from

£235

Popular in

December

Cheapest in

March

Average price

£587
30/1-6/2
  • 30/1-6/2
  • 2 total stops
  • 32h 15m total
  • London to St. Louis
Search Deals
6/2
  • 6/2
  • 1 total stop
  • 15h 33m total
  • London to St. Charles
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£40 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£27 potential savings vs. average return price).
Search Deals
Average for return flights in January 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 3 January 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

Fri 30/1

14:00-23:33

1 stop15h 33m

Lambert-St Louis

Fri 6/2

11:18-10:00

1 stop16h 42m

£345

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 30/1

06:30-13:55

1 stop13h 25m

Lambert-St Louis

Fri 6/2

11:22-06:20

1 stop12h 58m

£432

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 30/1

06:30-13:55

1 stop13h 25m

Lambert-St Louis

Fri 6/2

11:22-08:25

1 stop15h 03m

£434

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 29/1

09:00-21:13

2 stops18h 13m

Lambert-St Louis

Thu 5/2

09:57-06:40

2 stops14h 43m

£443

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 5/2

06:50-16:03

2 stops15h 13m

Lambert-St Louis

Mon 9/2

15:11-07:55

1 stop10h 44m

£449

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 30/1

08:30-19:27

2 stops16h 57m

Lambert-St Louis

Fri 6/2

13:15-10:25

2 stops15h 10m

£449

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 19/3

08:30-21:42

2 stops18h 12m

Lambert-St Louis

Thu 26/3

07:41-07:10

2 stops18h 29m

£451

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 18/3

06:15-21:11

2 stops19h 56m

Lambert-St Louis

Thu 26/3

11:59-07:00

1 stop14h 01m

£451

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 14/5

08:40-08:18

2 stops29h 38m

Lambert-St Louis

Sun 17/5

13:00-06:30

1 stop11h 30m

£457

LondonSt. Louis

LCY - STL

LCYSTL

London City

Thu 19/2

07:50-23:28

2 stops21h 38m

Lambert-St Louis

Mon 23/2

10:37-14:35

2 stops21h 58m

£558

Flights are sorted by cheapest return flights first.

Deals found on 1/1

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 26 December 2025.

To ensure you get the cheapest price possible for a flight to St. Charles, you should look to book at least 52 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 16 hours 35 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.

Finnair
Finnair
From £488
British Airways
British Airways
From £479
Virgin Atlantic
Virgin Atlantic
From £487
United Airlines
United Airlines
From £595

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

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

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 3 January 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
1,343 reviews
Check prices

Overall

7.6

Food

6.7

Crew

8.1

Entertainment

6.9

Comfort

7.4

Boarding

7.6

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
Finnair
7.6
Good
1,343 reviews
Finnair
7.6
Good
1,343 reviews
Check prices

Overall

7.6

Food

6.7

Crew

8.1

Entertainment

6.9

Comfort

7.4

Boarding

7.6

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
United Airlines
7.4
Good
9,137 reviews
Finnair
7.6
Good
1,343 reviews
Check prices

Overall

7.6

Food

6.7

Crew

8.1

Entertainment

6.9

Comfort

7.4

Boarding

7.6

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
Air Canada
7.1
Good
10,581 reviews
Finnair
7.6
Good
1,343 reviews
Check prices

Overall

7.6

Food

6.7

Crew

8.1

Entertainment

6.9

Comfort

7.4

Boarding

7.6

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
Iberia
7.0
Good
3,059 reviews
Finnair
7.6
Good
1,343 reviews
Check prices

Overall

7.6

Food

6.7

Crew

8.1

Entertainment

6.9

Comfort

7.4

Boarding

7.6

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.
British Airways
6.7
Okay
7,642 reviews
Finnair
7.6
Good
1,343 reviews
Check prices

Overall

7.6

Food

6.7

Crew

8.1

Entertainment

6.9

Comfort

7.4

Boarding

7.6

Reviews

1 / 20
4.0
Okay

Anonymous,Sept 2025

WAW - HEL

My flight to Europe was cancelled and rebooked. Bags got lost by FinnAir. Flight back home from Europe was cancelled the very next day after we landed. Zero compensation for these back to back cancellations on the exact same trip. Kayak doesn’t help with flight cancellation before trips says to contact trip protection only for trip protection to say it’s up to kayak. Don’t fly FinnAir.

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 £150, however they can be found for as little as £150.

  • 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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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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