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$1,409+ Cheap flights to St. Charles

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
27 Aug — 3 Sep1
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 28 July 2026.

Wed 9/913:15
SYD
-
STL
3 stops37h 02m
Multiple Airlines
Wed 16/912:17
STL
-
SYD
3 stops32h 33m
Multiple Airlines
Deal found 26/7$1,409
Wed 14/1010:10
SYD
-
STL
1 stop29h 36m
American Airlines
Sun 8/1112:58
STL
-
SYD
1 stop24h 57m
American Airlines
Deal found 24/7$1,501
Wed 14/1011:20
SYD
-
STL
2 stops21h 17m
United Airlines
Sun 8/1111:15
STL
-
SYD
2 stops28h 50m
United Airlines
Deal found 24/7$1,574
Sun 6/913:15
SYD
-
STL
3 stops41h 13m
Multiple Airlines
Sun 13/910:20
STL
-
SYD
3 stops45h 05m
Multiple Airlines
Deal found 24/7$1,606
Tue 25/810:20
SYD
-
STL
2 stops25h 57m
United Airlines
Sat 29/816:40
STL
-
SYD
2 stops23h 20m
United Airlines
Deal found 23/7$1,622
Sun 6/909:10
SYD
-
STL
1 stop28h 49m
Qantas Airways
Sun 13/906:00
STL
-
SYD
1 stop34h 05m
Qantas Airways
Deal found 23/7$1,634
Thu 15/1009:55
SYD
-
STL
2 stops28h 35m
Air New Zealand
Sun 8/1108:00
STL
-
SYD
2 stops31h 35m
Air New Zealand
Deal found 26/7$1,668
Tue 25/809:10
SYD
-
STL
1 stop28h 49m
American Airlines
Sat 29/806:00
STL
-
SYD
1 stop34h 05m
American Airlines
Deal found 23/7$1,676

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 647,157 searches and data was last updated on 28 July 2026.

Return from

$1,409

Popular in

April

Cheapest in

September

Average price

$1,515
9/9-16/9
  • 9/9-16/9
  • 6 total stops
  • 69h 35m total
  • Sydney to St. Louis
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($134 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($52 potential savings vs. average return price).
Search Deals
Average for return flights in July 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 647,157 searches and data was last updated on 28 July 2026.
Use the filters below to find and compare flights to St. Charles that are best for you.

Fly from

Route

Depart

Return

Price

Cheapest return flight

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 14/10

10:10-23:46

1 stop29h 36m

Lambert-St Louis

Sun 8/11

12:58-06:55

1 stop24h 57m

$1,501

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 14/10

11:20-16:37

2 stops21h 17m

Lambert-St Louis

Sun 8/11

11:15-09:05

2 stops28h 50m

$1,574

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 25/8

09:10-20:26

2 stops26h 16m

Lambert-St Louis

Sat 29/8

10:16-07:05

2 stops29h 49m

$1,679

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 9/9

12:00-19:07

1 stop22h 07m

Lambert-St Louis

Wed 16/9

14:30-07:05

2 stops25h 35m

$1,747

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 1/11

11:20-00:45

1 stop29h 25m

Lambert-St Louis

Tue 24/11

14:54-09:00

2 stops25h 06m

$1,797

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 6/9

09:15-20:42

2 stops26h 27m

Lambert-St Louis

Sun 13/9

06:00-06:50

2 stops33h 50m

$1,815
Fastest return journey

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 15/10

10:30-16:37

2 stops22h 07m

Lambert-St Louis

Sun 8/11

15:15-09:05

2 stops24h 50m

$1,842

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 1/11

11:20-17:57

2 stops22h 37m

Lambert-St Louis

Tue 24/11

13:08-09:05

3 stops26h 57m

$1,912

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 18/11

11:05-20:19

3 stops26h 14m

Lambert-St Louis

Tue 1/12

14:23-06:25

2 stops23h 02m

$2,085

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 14/10

11:55-23:44

3 stops27h 49m

Lambert-St Louis

Sun 8/11

13:40-08:35

3 stops25h 55m

$2,160

Flights are sorted by cheapest return flights first.

Deals found on 24/7

Sorted by cheapest first

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 21 hours 10 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 Qantas Airways, United Airlines and American Airlines.

United Airlines
United Airlines
From $1,051
Qantas Airways
Qantas Airways
From $1,113
American Airlines
American Airlines
From $1,488
Air Canada
Air Canada
From $1,046

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

The cheapest airlines flying from Sydney to St. Charles are United Airlines, American Airlines 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 28 July 2026.
Get a feel of what it's like to fly with Qantas Airways,United Airlines, andAmerican Airlines 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
1,068 reviews
Check prices

Food

7.0

Boarding

7.7

Entertainment

7.2

Comfort

7.4

Crew

8.1

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Tania,May 2026

SYD - DFW

The trip was great and the flight attendants were lovely. It was my honeymoon and ai thought I lost my gold brecelet. They searched until they found it and gave us a bottle of champaign to celebrate our honeymoon. They were lovely!
Qantas Airways
7.5
Good
1,068 reviews
Qantas Airways
7.5
Good
1,068 reviews
Check prices

Food

7.0

Boarding

7.7

Entertainment

7.2

Comfort

7.4

Crew

8.1

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Tania,May 2026

SYD - DFW

The trip was great and the flight attendants were lovely. It was my honeymoon and ai thought I lost my gold brecelet. They searched until they found it and gave us a bottle of champaign to celebrate our honeymoon. They were lovely!
United Airlines
7.4
Good
10,045 reviews
Qantas Airways
7.5
Good
1,068 reviews
Check prices

Food

7.0

Boarding

7.7

Entertainment

7.2

Comfort

7.4

Crew

8.1

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Tania,May 2026

SYD - DFW

The trip was great and the flight attendants were lovely. It was my honeymoon and ai thought I lost my gold brecelet. They searched until they found it and gave us a bottle of champaign to celebrate our honeymoon. They were lovely!
American Airlines
7.1
Good
11,840 reviews
Qantas Airways
7.5
Good
1,068 reviews
Check prices

Food

7.0

Boarding

7.7

Entertainment

7.2

Comfort

7.4

Crew

8.1

Overall

7.5

Reviews

1 / 20
10.0
Excellent

Tania,May 2026

SYD - DFW

The trip was great and the flight attendants were lovely. It was my honeymoon and ai thought I lost my gold brecelet. They searched until they found it and gave us a bottle of champaign to celebrate our honeymoon. They were lovely!

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.

  • How much is a return flight to St. Charles?

    A return flight to St. Charles will typically cost around $937, however they can be found for as little as $937.

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

    For those looking to save time traveling to St. Charles, Sydney Kingsford Smith 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. St Ann Townhome Less Than 1 Mi to International 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.

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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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