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$1,065+ 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 8/6. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
11 Apr — 18 Apr1
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 12 March 2026.

Wed 5/811:55
SYD
-
STL
2 stops37h 12m
Air New Zealand
Sat 29/815:02
STL
-
SYD
2 stops26h 43m
Air New Zealand
Deal found 9/3$1,561
Tue 21/409:20
SYD
-
STL
2 stops26h 34m
Air Canada
Tue 28/416:30
STL
-
SYD
2 stops23h 50m
Air Canada
Deal found 7/3$1,635
Sat 8/809:55
SYD
-
STL
2 stops25h 47m
Air New Zealand
Mon 31/808:52
STL
-
SYD
2 stops32h 53m
Air New Zealand
Deal found 9/3$1,642
Wed 5/811:55
SYD
-
STL
3 stops27h 02m
Multiple Airlines
Sat 29/815:02
STL
-
SYD
2 stops28h 38m
Multiple Airlines
Deal found 11/3$1,698
Sun 3/509:20
SYD
-
STL
2 stops41h 46m
Air Canada
Sun 17/507:05
STL
-
SYD
2 stops57h 15m
Air Canada
Deal found 8/3$1,744
Fri 7/809:20
SYD
-
STL
2 stops43h 42m
Air Canada
Mon 31/812:10
STL
-
SYD
3 stops52h 10m
Air Canada
Deal found 9/3$1,759
Sat 8/809:20
SYD
-
STL
2 stops43h 42m
Air Canada
Mon 31/812:10
STL
-
SYD
3 stops52h 10m
Air Canada
Deal found 9/3$1,833

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 12 March 2026.

Return from

$1,561

One-way from

$1,065

Popular in

July

Cheapest in

May

Average price

$1,674
Air New Zealand
  • Air New Zealand
  • 5/8-29/8
  • 4 total stops
  • 63h 55m total
  • Sydney to St. Louis
Search Deals
8/6
  • 8/6
  • 3 total stops
  • 40h 27m total
  • Sydney to St. Charles
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($96 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($58 potential savings vs. average return price).
Search Deals
Average for return flights in March 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 12 March 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

Sun 3/5

09:20-12:06

2 stops41h 46m

Lambert-St Louis

Sun 17/5

07:05-07:20

2 stops57h 15m

$1,744

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 7/8

11:55-10:07

2 stops37h 12m

Lambert-St Louis

Mon 31/8

15:02-08:45

2 stops26h 43m

$1,898

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 24/4

09:20-15:25

2 stops45h 05m

Lambert-St Louis

Fri 1/5

14:35-07:20

2 stops25h 45m

$1,898

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 27/5

09:20-20:43

2 stops26h 23m

Lambert-St Louis

Sun 31/5

05:10-07:20

2 stops35h 10m

$1,921
Fastest return journey

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 8/8

17:50-23:08

1 stop20h 18m

Lambert-St Louis

Mon 31/8

15:33-08:15

2 stops25h 42m

$2,110

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 7/8

14:10-18:29

2 stops43h 19m

Lambert-St Louis

Mon 31/8

19:46-06:55

1 stop20h 09m

$2,117

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 5/8

11:55-23:57

3 stops27h 02m

Lambert-St Louis

Sat 29/8

13:36-08:45

3 stops28h 09m

$2,128

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 21/4

09:10-23:57

1 stop29h 47m

Lambert-St Louis

Tue 28/4

06:21-07:05

1 stop33h 44m

$2,331

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 24/4

09:10-23:57

1 stop29h 47m

Lambert-St Louis

Fri 1/5

06:21-07:05

1 stop33h 44m

$2,377
Cheapest one-way

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 8/6

11:55-13:22

3 stops40h 27m

$1,065

Flights are sorted by cheapest return flights first.

Deals found on 10/3

Showing 1-10 of 15 resultsSorted by cheapest first
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 20 hours 21 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 $744
Qantas Airways
Qantas Airways
From $1,103
Air Canada
Air Canada
From $1,023

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 12 March 2026.
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
1,003 reviews
Check prices

Overall

7.5

Comfort

7.4

Entertainment

7.2

Boarding

7.7

Food

7.0

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
1,003 reviews
Qantas Airways
7.5
Good
1,003 reviews
Check prices

Overall

7.5

Comfort

7.4

Entertainment

7.2

Boarding

7.7

Food

7.0

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
9,415 reviews
Qantas Airways
7.5
Good
1,003 reviews
Check prices

Overall

7.5

Comfort

7.4

Entertainment

7.2

Boarding

7.7

Food

7.0

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.
Air Canada
7.1
Good
10,800 reviews
Qantas Airways
7.5
Good
1,003 reviews
Check prices

Overall

7.5

Comfort

7.4

Entertainment

7.2

Boarding

7.7

Food

7.0

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, Sydney Kingsford Smith offers the quickest one-way flight (20 hours 21 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. 3-bedroom building in serene Saint Ann with WiFi, AC is the closest property to Lambert-St Louis (0.0 km away from Lambert-St Louis).

See more FAQs

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Can Cheapflights find flights to St. Charles with no change fees?

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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