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£282+ 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 16/1. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
2 Jan — 9 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 3 December 2025.

Wed 10/1214:10LHR - STL
1 stop12h 14mBritish Airways
Thu 8/112:11STL - LHR
1 stop12h 19mBritish Airways
Deal found 1/12£566
Thu 25/1209:55LHR - STL
1 stop15h 35mBritish Airways
Sun 18/118:44STL - LHR
1 stop10h 51mBritish Airways
Deal found 1/12£627
Wed 10/1212:35LHR - STL
1 stop13h 49mBritish Airways
Tue 6/114:54STL - LHR
1 stop22h 06mBritish Airways
Deal found 1/12£634
Tue 30/1211:05LHR - STL
1 stop17h 11mVirgin Atlantic
Tue 6/111:23STL - LHR
1 stop13h 42mVirgin Atlantic
Deal found 2/12£641
Sun 14/1214:10LGW - STL
1 stop24h 49mMultiple Airlines
Wed 7/117:11STL - LGW
2 stops54h 49mMultiple Airlines
Deal found 30/11£650
Thu 4/1207:50LHR - STL
2 stops17h 15mAer Lingus
Mon 8/1215:22STL - LHR
2 stops14h 03mAer Lingus
Deal found 1/12£657
Wed 17/1213:30LHR - STL
1 stop26h 01mFinnair
Wed 7/117:59STL - LHR
2 stops22h 11mFinnair
Deal found 1/12£673
Fri 5/1219:45LHR - STL
2 stops30h 53mAer Lingus
Mon 8/1213:59STL - LHR
2 stops15h 26mAer Lingus
Deal found 1/12£684
Thu 25/1208:40LHR - STL
2 stops18h 01mDelta
Sun 18/112:00STL - LHR
1 stop17h 40mDelta
Deal found 2/12£710
Tue 16/1208:40LCY - STL
2 stops17h 58mBritish Airways
Tue 6/115:54STL - LCY
2 stops44h 36mBritish Airways
Deal found 30/11£783
Wed 17/1208:40LCY - STL
2 stops17h 58mBritish Airways
Wed 7/115:54STL - LCY
2 stops44h 36mBritish Airways
Deal found 1/12£791
Sat 6/1211:40LGW - STL
2 stops51h 19mMultiple Airlines
Thu 11/1215:30STL - LGW
1 stop12h 30mMultiple Airlines
Deal found 1/12£801

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 3 December 2025.

Return from

£326

One-way from

£282

Popular in

December

Cheapest in

March

Average price

£1,069
12/1-26/1
  • 12/1-26/1
  • 2 total stops
  • 32h 17m total
  • London to St. Louis
Search Deals
16/1
  • 16/1
  • 3 total stops
  • 42h 39m total
  • London to St. Charles
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (£47 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£30 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 3 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 12/1

14:00-22:33

1 stop14h 33m

Lambert-St Louis

Mon 26/1

10:16-10:00

1 stop17h 44m

£326

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 9/2

18:45-16:14

2 stops27h 29m

Lambert-St Louis

Sun 15/2

11:34-19:00

1 stop25h 26m

£496

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Thu 22/1

11:20-23:12

2 stops41h 52m

Lambert-St Louis

Mon 26/1

10:17-09:00

2 stops16h 43m

£514

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/2

11:00-18:14

1 stop13h 14m

Lambert-St Louis

Wed 11/2

15:20-08:15

1 stop10h 55m

£514

LondonSt. Louis

LGW - STL

LGWSTL

London Gatwick

Wed 14/1

13:00-06:51

2 stops47h 51m

Lambert-St Louis

Wed 21/1

17:42-10:00

1 stop34h 18m

£514

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Wed 4/2

11:45-18:34

1 stop12h 49m

Lambert-St Louis

Sun 15/2

18:33-06:55

1 stop30h 22m

£514

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 10/5

16:20-21:48

2 stops35h 28m

Lambert-St Louis

Mon 18/5

06:05-06:50

1 stop18h 45m

£515

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 10/5

16:20-21:48

2 stops35h 28m

Lambert-St Louis

Tue 19/5

11:14-09:05

1 stop15h 51m

£515

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Sun 10/5

18:45-21:48

2 stops33h 03m

Lambert-St Louis

Wed 20/5

09:15-07:50

1 stop16h 35m

£515

LondonSt. Louis

LHR - STL

LHRSTL

London Heathrow

Mon 12/1

11:45-18:34

1 stop12h 49m

Lambert-St Louis

Mon 26/1

11:55-10:00

1 stop16h 05m

£516

Flights are sorted by cheapest return flights first.

Deals found on 1/12

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 28 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 16 hours 29 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 £499
British Airways
British Airways
From £524
Virgin Atlantic
Virgin Atlantic
From £536
United Airlines
United Airlines
From £607

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

The cheapest airlines flying from London to St. Charles are American Airlines, KLM 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 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
1,334 reviews
Check prices

Comfort

7.4

Boarding

7.6

Crew

8.1

Food

6.7

Overall

7.6

Entertainment

6.9

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

Comfort

7.4

Boarding

7.6

Crew

8.1

Food

6.7

Overall

7.6

Entertainment

6.9

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
9,063 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Comfort

7.4

Boarding

7.6

Crew

8.1

Food

6.7

Overall

7.6

Entertainment

6.9

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
10,497 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Comfort

7.4

Boarding

7.6

Crew

8.1

Food

6.7

Overall

7.6

Entertainment

6.9

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
3,038 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Comfort

7.4

Boarding

7.6

Crew

8.1

Food

6.7

Overall

7.6

Entertainment

6.9

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
7,550 reviews
Finnair
7.6
Good
1,334 reviews
Check prices

Comfort

7.4

Boarding

7.6

Crew

8.1

Food

6.7

Overall

7.6

Entertainment

6.9

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 £204, however they can be found for as little as £125.

  • 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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