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$1,422+ Cheap flights to St. Charles

— STL
13 Oct — 20 Oct1
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

Mon 26/1010:20 -
2 stops45h 03m
Mon 2/1116:05 -
2 stops48h 30m
Deal found 11/9$1,422
Mon 12/1010:20 -
2 stops26h 00m
Thu 5/1113:40 -
2 stops26h 55m
Deal found 9/9$1,436
Mon 12/1010:20 -
3 stops48h 21m
Thu 5/1113:40 -
2 stops26h 55m
Deal found 9/9$1,500
Mon 26/1011:10 -
1 stop28h 36m
Mon 2/1114:54 -
2 stops25h 06m
Deal found 11/9$1,562
Wed 21/1010:10 -
1 stop29h 36m
Sat 24/1015:20 -
2 stops35h 35m
Deal found 11/9$1,580
Wed 21/1010:20 -
2 stops29h 24m
Sat 24/1005:10 -
2 stops35h 25m
Deal found 11/9$1,588

Find flight deals to St. Charles

Return from

$1,422

One-way from

$2,128

Popular in

April

Cheapest in

September

Average price

$1,449
Air Canada
  • Air Canada
  • 26/10-2/11
  • 4 total stops
  • 93h 33m total
  • Sydney to St. Louis
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Qantas Airways
  • Qantas Airways
  • 4/1-31/12
  • 2 total stops
  • 40h 21m total
  • Sydney to St. Charles
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($218 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($47 potential savings vs. average return price).
Search Deals
Average for return flights in September 2026
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Cheapflights Fare Finder

 
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 Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Mon 12/10

10:20-20:20

2 stops26h 00m

Lambert-St Louis

Thu 5/11

13:40-09:35

2 stops26h 55m

$1,436

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 20/1

11:20-18:08

2 stops23h 48m

Lambert-St Louis

Sat 13/2

19:06-06:20

1 stop42h 14m

$1,573

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 21/10

10:20-23:44

2 stops29h 24m

Lambert-St Louis

Sat 24/10

08:00-08:35

3 stops32h 35m

$1,599

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 20/1

11:20-20:59

2 stops26h 39m

Lambert-St Louis

Sat 13/2

11:25-09:35

3 stops29h 10m

$1,601

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 20/1

14:05-16:28

1 stop19h 23m

Lambert-St Louis

Sat 13/2

06:30-09:00

1 stop33h 30m

$1,610

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Mon 12/10

10:10-23:46

1 stop29h 36m

Lambert-St Louis

Thu 5/11

14:54-09:00

2 stops25h 06m

$1,642

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 20/1

11:20-23:33

1 stop29h 13m

Lambert-St Louis

Sat 13/2

19:01-06:55

1 stop42h 54m

$1,656

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 20/1

14:05-16:28

1 stop19h 23m

Lambert-St Louis

Sat 13/2

14:54-09:00

2 stops25h 06m

$1,707

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Mon 4/1

18:45-18:06

2 stops40h 21m

Lambert-St Louis

Wed 31/12

00:00-16:00

Nonstop0h 00m

$2,128
Fastest return journey

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Mon 4/1

19:40-08:29

3 stops29h 49m

Lambert-St Louis

Wed 31/12

00:00-16:00

Nonstop0h 00m

$3,006

Flights are sorted by cheapest return flights first.

Deals found on 10/9

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

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 29 hours 20 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.

Qantas Airways
Qantas Airways
From $1,086
United Airlines
United Airlines
From $1,143
American Airlines
American Airlines
From $1,451

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

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

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 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
1,093 reviews
Check prices

Boarding

7.7

Comfort

7.4

Entertainment

7.2

Food

7.0

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
1,093 reviews
Qantas Airways
7.5
Good
1,093 reviews
Check prices

Boarding

7.7

Comfort

7.4

Entertainment

7.2

Food

7.0

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
10,211 reviews
Qantas Airways
7.5
Good
1,093 reviews
Check prices

Boarding

7.7

Comfort

7.4

Entertainment

7.2

Food

7.0

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
12,049 reviews
Qantas Airways
7.5
Good
1,093 reviews
Check prices

Boarding

7.7

Comfort

7.4

Entertainment

7.2

Food

7.0

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, Qantas Airways 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 $399, however they can be found for as little as $378.

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

    For those looking to save time traveling to St. Charles, Melbourne offers the quickest one-way flight (24 hours 59 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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