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$1,128+ 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 25/12. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
30 Nov — 7 Dec1
1 adult
1 adult, Economy, 0 bags

Find flight deals to St. Charles

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 31 October 2025.

Mon 24/1111:20SYD - STL
2 stops45h 09mAir Canada
Sun 30/1116:05STL - SYD
2 stops48h 30mAir Canada
Deal found 30/10$1,393
Mon 24/1111:20SYD - STL
1 stop29h 22mAmerican Airlines
Sun 30/1107:00STL - SYD
1 stop33h 00mAmerican Airlines
Deal found 30/10$1,483
Mon 24/1111:50SYD - STL
2 stops22h 49mUnited Airlines
Sun 30/1111:20STL - SYD
1 stop26h 40mUnited Airlines
Deal found 30/10$1,509
Sun 14/1217:45SYD - STL
1 stop23h 12mAmerican Airlines
Sun 21/1206:20STL - SYD
1 stop32h 05mAmerican Airlines
Deal found 30/10$2,630
Sun 14/1217:45SYD - STL
1 stop23h 12mQantas Airways
Sun 21/1206:20STL - SYD
1 stop32h 05mQantas Airways
Deal found 30/10$2,720
Sun 14/1208:30SYD - STL
3 stops27h 35mMultiple Airlines
Sun 21/1211:41STL - SYD
2 stops27h 54mMultiple Airlines
Deal found 30/10$4,484
Sun 14/1211:20SYD - STL
3 stops28h 25mAir Canada
Sun 21/1208:05STL - SYD
2 stops32h 30mAir Canada
Deal found 30/10$6,234

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 647,157 searches and data was last updated on 31 October 2025.

Return from

$1,337

One-way from

$1,128

Popular in

December

Cheapest in

November

Average price

$1,910
Air Canada
  • Air Canada
  • 12/3-16/3
  • 4 total stops
  • 70h 39m total
  • Sydney to St. Louis
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Air Canada
  • Air Canada
  • 25/12
  • 2 total stops
  • 47h 22m total
  • Sydney to St. Charles
Search Deals
Highest demand for flights based on searches. 0% potential increase in price.
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($40 potential savings vs. average return price).
Search Deals
Average for return flights in October 2025
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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 647,157 searches and data was last updated on 31 October 2025.
Use the filters below to find and compare flights to St. Charles that are best for you.

Fly from

Sydney

Route

Depart

Return

Price

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 12/3

10:25-15:29

2 stops45h 04m

Lambert-St Louis

Mon 16/3

15:00-08:35

2 stops25h 35m

$1,337

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 24/11

11:20-15:29

2 stops45h 09m

Lambert-St Louis

Sun 30/11

16:05-09:35

2 stops48h 30m

$1,393

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 24/11

11:20-23:42

1 stop29h 22m

Lambert-St Louis

Sun 30/11

07:00-09:00

1 stop33h 00m

$1,483

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 24/11

11:50-17:39

2 stops22h 49m

Lambert-St Louis

Sun 30/11

11:20-07:00

1 stop26h 40m

$1,509

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 10/1

08:45-19:51

2 stops28h 06m

Lambert-St Louis

Sun 7/6

06:30-07:05

1 stop33h 35m

$1,975

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 10/1

14:15-21:35

2 stops24h 20m

Lambert-St Louis

Sun 7/6

06:00-06:35

2 stops33h 35m

$2,414

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 12/3

11:20-23:09

1 stop27h 49m

Lambert-St Louis

Mon 16/3

16:43-09:00

2 stops24h 17m

$2,497

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 12/3

11:50-15:54

1 stop20h 04m

Lambert-St Louis

Mon 16/3

16:35-07:00

1 stop22h 25m

$2,523

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 24/12

11:50-22:43

2 stops27h 53m

$1,171

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 25/12

11:50-09:49

1 stop38h 59m

$1,171

Flights are sorted by cheapest return flights first.

Deals found on 30/10

Showing 1-10 of 16 results
1
2

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

How long is the flight to St. Charles?

On average, a flight from Sydney to St. Charles takes 23 hours 24 minutes. Flights to St. Charles from other popular cities in Australia 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 Sydney to St. Charles are United Airlines, Qantas Airways and Air Canada.

United Airlines
United Airlines
From $1,246
Qantas Airways
Qantas Airways
From $1,507
Air Canada
Air Canada
From $1,155

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

The cheapest airlines flying from Sydney to St. Charles are United Airlines, Air Canada and Qantas 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 mm 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 31 October 2025.
Get a feel of what it's like to fly with Qantas Airways, United Airlines, andAir Canada to the United States by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
926 reviews
Check prices

Comfort

7.5

Boarding

7.7

Food

7.0

Overall

7.5

Entertainment

7.2

Crew

8.2

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.
Qantas Airways
7.5
Good
926 reviews
Qantas Airways
7.5
Good
926 reviews
Check prices

Comfort

7.5

Boarding

7.7

Food

7.0

Overall

7.5

Entertainment

7.2

Crew

8.2

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.
United Airlines
7.4
Good
8,995 reviews
Qantas Airways
7.5
Good
926 reviews
Check prices

Comfort

7.5

Boarding

7.7

Food

7.0

Overall

7.5

Entertainment

7.2

Crew

8.2

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.
Air Canada
7.1
Good
10,385 reviews
Qantas Airways
7.5
Good
926 reviews
Check prices

Comfort

7.5

Boarding

7.7

Food

7.0

Overall

7.5

Entertainment

7.2

Crew

8.2

Reviews

1 / 20
10.0
Excellent

Carol,Oct 2025

ADL - MEL

Smooth flight, good onboard staff who were very caring when I didn’t feel very well.

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, Air Canada is rated the highest out of the airlines that fly to St. Charles.

  • Where does the fastest flight to St. Charles depart from?

    For those looking to save time traveling to St. Charles, Brisbane offers the quickest one-way flight (21 hours 10 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 km away from Lambert-St Louis).

See more FAQs

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Certainly. Search results for flights to St. Charles shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights to St. Charles become cheaper?

Yes, Cheapflights has a feature called Price Alerts, which notifies users when flight prices change. Track prices for your flight to St. Charles today and book when you’re ready!

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