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£355+ 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 7/3. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
19 Dec — 26 Dec1
1 adult
1 adult, Economy, 0 bags

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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 19 November 2025.

Thu 11/1212:15LHR - STL
2 stops26h 44mMultiple Airlines
Sun 14/1209:54STL - LHR
2 stops18h 56mMultiple Airlines
Deal found 17/11£559
Thu 11/1214:00LGW - STL
1 stop24h 59mMultiple Airlines
Sun 14/1209:54STL - LGW
1 stop18h 06mMultiple Airlines
Deal found 17/11£569
Fri 5/1214:45LHR - STL
1 stop14h 21mBritish Airways
Wed 10/1214:48STL - LHR
1 stop12h 27mBritish Airways
Deal found 18/11£598
Sat 6/1214:45LHR - STL
1 stop12h 43mBritish Airways
Thu 11/1214:54STL - LHR
1 stop10h 06mBritish Airways
Deal found 18/11£598
Fri 5/1213:30LHR - STL
2 stops16h 29mFinnair
Wed 10/1214:48STL - LHR
2 stops12h 52mFinnair
Deal found 18/11£606
Sat 6/1211:05LHR - STL
1 stop18h 22mVirgin Atlantic
Thu 11/1210:45STL - LHR
2 stops14h 05mVirgin Atlantic
Deal found 18/11£611
Thu 11/1212:30LHR - STL
1 stop17h 12mVirgin Atlantic
Sun 14/1219:02STL - LHR
1 stop31h 58mVirgin Atlantic
Deal found 17/11£614
Mon 24/1109:50LHR - STL
2 stops19h 14mAer Lingus
Mon 1/1206:00STL - LHR
2 stops21h 05mAer Lingus
Deal found 17/11£614
Wed 3/1211:55LHR - STL
1 stop13h 34mBritish Airways
Thu 8/111:55STL - LHR
1 stop12h 55mBritish Airways
Deal found 17/11£624
Tue 25/1109:50LHR - STL
2 stops19h 25mAer Lingus
Thu 25/1209:08STL - LHR
2 stops16h 57mAer Lingus
Deal found 18/11£626
Thu 11/1207:05LHR - STL
3 stops19h 57mScandinavian Airlines
Sun 14/1213:57STL - LHR
2 stops22h 33mScandinavian Airlines
Deal found 17/11£632
Thu 11/1207:50LCY - STL
2 stops18h 31mBritish Airways
Sun 14/1218:53STL - LCY
2 stops31h 57mBritish Airways
Deal found 17/11£649

Flights to St. Charles in 2025

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 19 November 2025.

Return from

£544

One-way from

£355

Popular in

December

Cheapest in

March

Average price

£739
Virgin Atlantic
  • Virgin Atlantic
  • 13/1-23/1
  • 3 total stops
  • 30h 22m total
  • London to St. Louis
Search Deals
7/3
  • 7/3
  • 3 total stops
  • 53h 07m total
  • London to St. Charles
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (£51 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£31 potential savings vs. average return price).
Search Deals
Average for return flights in November 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 19 November 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

Thu 22/1

11:20-18:34

2 stops37h 14m

Lambert-St Louis

Mon 26/1

08:13-09:00

2 stops18h 47m

£547

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 5/3

11:20-19:30

2 stops38h 10m

Lambert-St Louis

Mon 9/3

07:35-07:30

2 stops18h 55m

£548

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Thu 8/1

14:45-23:12

1 stop14h 27m

Lambert-St Louis

Thu 29/1

12:11-06:30

1 stop12h 19m

£557

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 21/4

14:25-23:24

1 stop14h 59m

Lambert-St Louis

Tue 28/4

16:39-10:30

1 stop11h 51m

£561

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 20/4

15:15-23:24

1 stop14h 09m

Lambert-St Louis

Thu 23/4

11:14-07:20

1 stop14h 06m

£561

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 21/4

09:15-16:13

1 stop12h 58m

Lambert-St Louis

Mon 27/4

16:39-10:30

1 stop11h 51m

£561

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Tue 21/4

13:45-20:03

1 stop12h 18m

Lambert-St Louis

Sun 26/4

18:29-07:20

1 stop30h 51m

£561

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 20/4

06:30-16:49

2 stops16h 19m

Lambert-St Louis

Mon 27/4

09:00-06:30

1 stop15h 30m

£565

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 20/4

06:30-16:49

2 stops16h 19m

Lambert-St Louis

Tue 28/4

12:10-13:10

1 stop19h 00m

£565

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 7/1

12:40-23:25

2 stops16h 45m

Lambert-St Louis

Wed 14/1

09:59-08:45

2 stops16h 46m

£565

Flights are sorted by cheapest return flights first.

Deals found on 18/11

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 14 November 2025.

To ensure you get the cheapest price possible for a flight to St. Charles, you should look to book at least 13 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 42 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 Wednesday at midday, when prices are typically cheapest. Budget-minded travellers will want to avoid Saturday afternoons, 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 £504
British Airways
British Airways
From £586
Virgin Atlantic
Virgin Atlantic
From £541
United Airlines
United Airlines
From £609

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

The cheapest airlines flying from London to St. Charles are American Airlines, Scandinavian Airlines 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 19 November 2025.
Read through reviews of airlines serving the United States, such as Finnair, Air Canada, andIberia. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Finnair
7.6
Good
1,334 reviews
Check prices

Entertainment

6.9

Food

6.7

Boarding

7.6

Crew

8.1

Comfort

7.4

Overall

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
1,334 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Entertainment

6.9

Food

6.7

Boarding

7.6

Crew

8.1

Comfort

7.4

Overall

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
10,462 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Entertainment

6.9

Food

6.7

Boarding

7.6

Crew

8.1

Comfort

7.4

Overall

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
3,026 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Entertainment

6.9

Food

6.7

Boarding

7.6

Crew

8.1

Comfort

7.4

Overall

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.
Lufthansa
6.8
Okay
7,576 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Entertainment

6.9

Food

6.7

Boarding

7.6

Crew

8.1

Comfort

7.4

Overall

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
7,532 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Entertainment

6.9

Food

6.7

Boarding

7.6

Crew

8.1

Comfort

7.4

Overall

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 £154, however they can be found for as little as £154.

  • 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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