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$1,483+ 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 19/2. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
28 Feb — 7 Mar1
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 29 January 2026.

Tue 3/311:20
SYD
-
STL
1 stop29h 39m
American Airlines
Mon 13/412:27
STL
-
SYD
2 stops27h 38m
American Airlines
Deal found 26/1$1,483
Thu 19/211:20
SYD
-
STL
2 stops25h 09m
American Airlines
Mon 23/216:13
STL
-
SYD
2 stops23h 47m
American Airlines
Deal found 27/1$1,488
Thu 12/211:20
SYD
-
STL
2 stops25h 09m
American Airlines
Wed 18/214:31
STL
-
SYD
2 stops25h 29m
American Airlines
Deal found 27/1$1,498
Fri 13/206:30
SYD
-
STL
2 stops27h 43m
Qantas Airways
Thu 19/218:50
STL
-
SYD
2 stops30h 00m
Qantas Airways
Deal found 27/1$1,508
Tue 3/312:10
SYD
-
STL
2 stops25h 16m
United Airlines
Mon 13/416:49
STL
-
SYD
2 stops23h 11m
United Airlines
Deal found 28/1$1,513
Thu 12/311:20
SYD
-
STL
1 stop28h 38m
Multiple Airlines
Thu 19/318:50
STL
-
SYD
2 stops30h 50m
Multiple Airlines
Deal found 27/1$1,521
Thu 12/306:05
SYD
-
STL
2 stops25h 23m
Qantas Airways
Thu 19/318:50
STL
-
SYD
2 stops34h 50m
Qantas Airways
Deal found 27/1$1,532

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 29 January 2026.

Return from

$1,483

Popular in

December

Cheapest in

August

Average price

$1,882
American Airlines
  • American Airlines
  • 3/3-13/4
  • 3 total stops
  • 57h 17m total
  • Sydney to St. Louis
Search Deals
Highest demand for flights based on searches. 6% potential increase in price ($127 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($55 potential savings vs. average return price).
Search Deals
Average for return flights in January 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 29 January 2026.
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

Tue 3/3

11:20-21:12

2 stops26h 52m

Lambert-St Louis

Mon 13/4

12:27-07:05

2 stops27h 38m

$1,483

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 19/2

11:20-22:58

2 stops28h 38m

Lambert-St Louis

Mon 23/2

14:31-09:00

2 stops25h 29m

$1,483

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 12/2

11:20-19:29

2 stops25h 09m

Lambert-St Louis

Wed 18/2

14:31-09:00

2 stops25h 29m

$1,498

Flights are sorted by cheapest return flights first.

Deals found on 26/1

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 22 hours 34 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 $1,168
Qantas Airways
Qantas Airways
From $1,386
Air Canada
Air Canada
From $1,045

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 29 January 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
981 reviews
Check prices

Entertainment

7.2

Overall

7.5

Food

7.0

Boarding

7.7

Crew

8.2

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jan 2026

SYD - LAX

Flight Cancelled after sitting on plane for 1 1/2 hours. Didn't fly till next day. Incurred change fees on my connection in LAX. Next Day flight late. Missed connection on American in LA. AA couldn't rebook. Had to pay $800 to rebook on SW Air.
Qantas Airways
7.5
Good
981 reviews
Qantas Airways
7.5
Good
981 reviews
Check prices

Entertainment

7.2

Overall

7.5

Food

7.0

Boarding

7.7

Crew

8.2

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jan 2026

SYD - LAX

Flight Cancelled after sitting on plane for 1 1/2 hours. Didn't fly till next day. Incurred change fees on my connection in LAX. Next Day flight late. Missed connection on American in LA. AA couldn't rebook. Had to pay $800 to rebook on SW Air.
United Airlines
7.4
Good
9,214 reviews
Qantas Airways
7.5
Good
981 reviews
Check prices

Entertainment

7.2

Overall

7.5

Food

7.0

Boarding

7.7

Crew

8.2

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jan 2026

SYD - LAX

Flight Cancelled after sitting on plane for 1 1/2 hours. Didn't fly till next day. Incurred change fees on my connection in LAX. Next Day flight late. Missed connection on American in LA. AA couldn't rebook. Had to pay $800 to rebook on SW Air.
Air Canada
7.1
Good
10,667 reviews
Qantas Airways
7.5
Good
981 reviews
Check prices

Entertainment

7.2

Overall

7.5

Food

7.0

Boarding

7.7

Crew

8.2

Comfort

7.5

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jan 2026

SYD - LAX

Flight Cancelled after sitting on plane for 1 1/2 hours. Didn't fly till next day. Incurred change fees on my connection in LAX. Next Day flight late. Missed connection on American in LA. AA couldn't rebook. Had to pay $800 to rebook on SW Air.

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 (20 hours 48 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.

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