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£268+ 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 24/1. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
20 Jan — 27 Jan1
1 adult
1 adult, Economy, 0 bags

Flights to St. Charles in 2025

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 21 December 2025.

Thu 25/1210:05LHR - STL
1 stop15h 17mBritish Airways
Sun 18/111:55STL - LHR
1 stop12h 55mBritish Airways
Deal found 18/12£590
Thu 25/1213:00LHR - STL
1 stop32h 29mAir Canada
Sun 18/116:05STL - LHR
2 stops14h 55mAir Canada
Deal found 18/12£615
Thu 25/1208:20LHR - STL
1 stop17h 02mAmerican Airlines
Sun 18/114:54STL - LHR
1 stop10h 06mAmerican Airlines
Deal found 19/12£1,111
Sat 20/1218:45LHR - STL
2 stops30h 46mAer Lingus
Sat 27/1205:22STL - LHR
2 stops21h 43mAer Lingus
Deal found 19/12£1,183
Mon 22/1214:50LHR - STL
2 stops33h 30mMultiple Airlines
Mon 5/118:35STL - LHR
1 stop10h 40mMultiple Airlines
Deal found 19/12£1,189
Thu 25/1211:45LHR - STL
2 stops14h 56mDelta
Sun 18/109:59STL - LHR
2 stops16h 46mDelta
Deal found 19/12£1,199
Mon 22/1207:50LHR - STL
2 stops17h 41mAer Lingus
Mon 5/116:53STL - LHR
2 stops22h 12mAer Lingus
Deal found 19/12£1,314
Mon 22/1210:45LHR - STL
1 stop13h 32mVirgin Atlantic
Mon 5/117:00STL - LHR
1 stop32h 50mVirgin Atlantic
Deal found 19/12£1,352
Fri 19/1216:50LHR - STL
2 stops29h 38mVirgin Atlantic
Sat 31/117:04STL - LHR
2 stops45h 06mVirgin Atlantic
Deal found 19/12£1,357
Sat 20/1217:50LHR - STL
2 stops35h 52mKLM
Sat 31/117:04STL - LHR
1 stop12h 36mKLM
Deal found 20/12£1,374
Fri 19/1210:45LHR - STL
1 stop13h 48mKLM
Sat 31/113:00STL - LHR
1 stop16h 40mKLM
Deal found 19/12£1,386
Mon 22/1215:30LCY - STL
2 stops35h 21mBritish Airways
Mon 5/118:35STL - LCY
2 stops44h 10mBritish Airways
Deal found 19/12£1,443

Find flight deals to St. Charles

Find the latest flights to St. Charles in 2025, 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 21 December 2025.

Return from

£389

One-way from

£268

Popular in

December

Cheapest in

March

Average price

£1,022
2/2-9/2
  • 2/2-9/2
  • 3 total stops
  • 64h 35m total
  • London to St. Louis
Search Deals
24/1
  • 24/1
  • 1 total stop
  • 15h 33m total
  • London to St. Charles
Search Deals
Highest demand for flights based on searches. 4% potential increase in price (£33 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 December 2025
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 21 December 2025.
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 2/2

14:00-06:51

2 stops46h 51m

Lambert-St Louis

Mon 9/2

10:16-10:00

1 stop17h 44m

£389

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 22/1

19:30-13:55

1 stop24h 25m

Lambert-St Louis

Thu 5/2

18:40-11:15

1 stop10h 35m

£425

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 13/1

15:10-23:59

1 stop14h 49m

Lambert-St Louis

Fri 23/1

18:40-11:15

1 stop10h 35m

£436

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/2

06:00-15:29

2 stops39h 29m

Lambert-St Louis

Mon 9/2

13:15-07:55

1 stop12h 40m

£438

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 10/2

20:05-15:29

2 stops49h 24m

Lambert-St Louis

Wed 18/2

18:55-11:15

1 stop10h 20m

£445

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 10/2

14:10-21:15

1 stop13h 05m

Lambert-St Louis

Wed 18/2

14:00-07:50

1 stop11h 50m

£451

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Fri 1/5

06:30-13:25

1 stop12h 55m

Lambert-St Louis

Tue 5/5

14:20-09:35

1 stop13h 15m

£454

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 10/2

09:00-19:27

2 stops16h 27m

Lambert-St Louis

Wed 18/2

09:55-06:20

2 stops14h 25m

£460

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 2/2

09:00-19:27

2 stops16h 27m

Lambert-St Louis

Mon 9/2

13:15-10:25

2 stops15h 10m

£460

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 5/5

06:10-23:24

2 stops23h 14m

Lambert-St Louis

Mon 11/5

19:03-12:50

1 stop11h 47m

£463

Flights are sorted by cheapest return flights first.

Deals found on 17/12

Showing 1-10 of 60 results
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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 12 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 20 hours 58 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.

When is the cheapest time to fly to St. Charles?

Use this chart to determine the cheapest time to fly return from London to St. Charles. Price data was last updated on 16 December 2024.

Users looking for the lowest fares to St. Charles should consider flying on Tuesday evenings, when prices are typically cheapest. Budget-minded travellers will want to avoid Sunday mornings, when prices are usually at their highest.

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 £492
British Airways
British Airways
From £482
Virgin Atlantic
Virgin Atlantic
From £511
United Airlines
United Airlines
From £599

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 KLM.

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 21 December 2025.
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
1,339 reviews
Check prices

Food

6.7

Overall

7.6

Crew

8.1

Comfort

7.4

Entertainment

6.9

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

Food

6.7

Overall

7.6

Crew

8.1

Comfort

7.4

Entertainment

6.9

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
9,100 reviews
Finnair
7.6
Good
1,339 reviews
Check prices

Food

6.7

Overall

7.6

Crew

8.1

Comfort

7.4

Entertainment

6.9

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
10,549 reviews
Finnair
7.6
Good
1,339 reviews
Check prices

Food

6.7

Overall

7.6

Crew

8.1

Comfort

7.4

Entertainment

6.9

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
3,055 reviews
Finnair
7.6
Good
1,339 reviews
Check prices

Food

6.7

Overall

7.6

Crew

8.1

Comfort

7.4

Entertainment

6.9

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
7,600 reviews
Finnair
7.6
Good
1,339 reviews
Check prices

Food

6.7

Overall

7.6

Crew

8.1

Comfort

7.4

Entertainment

6.9

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 £1,306, however they can be found for as little as £103.

  • 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?

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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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