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$1,967+ 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 20/5. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
19 May — 26 May1
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 19 April 2026.

Wed 20/509:20
SYD
-
STL
2 stops41h 46m
Air Canada
Thu 28/513:05
STL
-
SYD
2 stops27h 15m
Air Canada
Deal found 16/4$1,967
Mon 1/609:10
SYD
-
STL
1 stop29h 46m
Qantas Airways
Mon 8/606:35
STL
-
SYD
1 stop33h 30m
Qantas Airways
Deal found 16/4$2,017
Mon 1/609:20
SYD
-
STL
2 stops26h 05m
Air Canada
Mon 8/613:05
STL
-
SYD
2 stops51h 15m
Air Canada
Deal found 16/4$2,047
Thu 23/709:20
SYD
-
STL
2 stops29h 37m
Air Canada
Mon 10/808:55
STL
-
SYD
2 stops55h 25m
Air Canada
Deal found 17/4$2,056
Thu 23/709:10
SYD
-
STL
1 stop29h 49m
American Airlines
Sun 9/808:36
STL
-
SYD
2 stops31h 29m
American Airlines
Deal found 17/4$2,069
Sat 15/806:25
SYD
-
STL
2 stops31h 30m
Qantas Airways
Wed 9/917:11
STL
-
SYD
2 stops23h 49m
Qantas Airways
Deal found 14/4$2,077
Thu 23/717:50
SYD
-
STL
1 stop21h 09m
American Airlines
Wed 12/806:00
STL
-
SYD
1 stop34h 05m
American Airlines
Deal found 17/4$2,079
Mon 27/709:15
SYD
-
STL
2 stops29h 38m
Delta
Wed 12/808:50
STL
-
SYD
2 stops31h 00m
Delta
Deal found 17/4$2,094

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 19 April 2026.

Return from

$1,967

Popular in

April

Cheapest in

September

Average price

$2,286
Air Canada
  • Air Canada
  • 20/5-28/5
  • 4 total stops
  • 69h 01m total
  • Sydney to St. Louis
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($98 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($41 potential savings vs. average return price).
Search Deals
Average for return flights in April 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 19 April 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 20/5

09:20-12:06

2 stops41h 46m

Lambert-St Louis

Thu 28/5

13:05-07:20

3 stops51h 15m

$2,054

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 27/7

09:15-23:53

2 stops29h 38m

Lambert-St Louis

Tue 11/8

12:10-06:50

2 stops27h 40m

$2,094

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 23/7

09:15-18:59

2 stops24h 44m

Lambert-St Louis

Sun 9/8

15:57-06:50

2 stops23h 53m

$2,094

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 28/7

09:15-23:22

2 stops29h 07m

Lambert-St Louis

Wed 12/8

12:10-06:50

2 stops27h 40m

$2,094

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 29/7

09:15-16:51

2 stops22h 36m

Lambert-St Louis

Sun 9/8

08:48-06:50

2 stops31h 02m

$2,094

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 27/7

09:15-22:12

2 stops27h 57m

Lambert-St Louis

Sun 9/8

11:18-06:50

2 stops28h 32m

$2,094

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 9/7

09:20-16:33

2 stops22h 13m

Lambert-St Louis

Tue 21/7

08:55-07:20

2 stops31h 25m

$2,321

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 15/8

06:25-19:14

3 stops27h 49m

Lambert-St Louis

Wed 9/9

17:11-08:00

2 stops23h 49m

$2,450
Fastest return journey

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 9/7

10:20-18:17

1 stop22h 57m

Lambert-St Louis

Tue 21/7

19:23-06:55

1 stop20h 32m

$2,668

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 8/5

08:55-23:59

2 stops54h 04m

Lambert-St Louis

Tue 12/5

06:21-06:20

2 stops32h 59m

$2,882

Flights are sorted by cheapest return flights first.

Deals found on 16/4

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 37 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 American Airlines.

United Airlines
United Airlines
From $743
Qantas Airways
Qantas Airways
From $1,086
Air Canada
Air Canada
From $1,020
American Airlines
American Airlines
From $1,607

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 19 April 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
1,020 reviews
Check prices

Comfort

7.5

Entertainment

7.2

Food

7.0

Overall

7.5

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
Qantas Airways
7.5
Good
1,020 reviews
Qantas Airways
7.5
Good
1,020 reviews
Check prices

Comfort

7.5

Entertainment

7.2

Food

7.0

Overall

7.5

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
United Airlines
7.4
Good
9,603 reviews
Qantas Airways
7.5
Good
1,020 reviews
Check prices

Comfort

7.5

Entertainment

7.2

Food

7.0

Overall

7.5

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
American Airlines
7.1
Good
11,621 reviews
Qantas Airways
7.5
Good
1,020 reviews
Check prices

Comfort

7.5

Entertainment

7.2

Food

7.0

Overall

7.5

Boarding

7.7

Crew

8.1

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.

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, United Airlines 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 1 minute).

  • 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.

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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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