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$1,154+ 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 24/9. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
10 Sep — 17 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 11 August 2026.

Wed 7/1006:05 -
3 stops43h 35m
Wed 21/1010:35 -
3 stops34h 15m
Deal found 9/8$1,337
Mon 10/809:10 -
1 stop28h 49m
Sun 23/806:00 -
2 stops36h 20m
Deal found 7/8$1,602
Wed 7/1010:10 -
1 stop29h 36m
Wed 21/1006:04 -
1 stop34h 01m
Deal found 9/8$1,672
Wed 21/1010:10 -
1 stop29h 36m
Sat 14/1114:54 -
2 stops28h 01m
Deal found 7/8$1,708
Wed 9/917:50 -
1 stop20h 40m
Sat 19/917:00 -
1 stop22h 55m
Deal found 6/8$1,723
Sat 14/1111:20 -
1 stop29h 25m
Mon 23/1114:54 -
2 stops25h 06m
Deal found 7/8$1,735
Mon 2/1114:05 -
1 stop21h 10m
Mon 16/1114:54 -
1 stop23h 01m
Deal found 9/8$1,736

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 11 August 2026.

Return from

$1,337

One-way from

$1,154

Popular in

April

Cheapest in

September

Average price

$1,507
7/10-21/10
  • 7/10-21/10
  • 6 total stops
  • 77h 50m total
  • Sydney to St. Louis
Search Deals
Delta
  • Delta
  • 24/9
  • 2 total stops
  • 38h 25m total
  • Sydney to St. Charles
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($225 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($49 potential savings vs. average return price).
Search Deals
Average for return flights in August 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 11 August 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
Fastest return journey

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 21/10

18:50-23:46

1 stop20h 56m

Lambert-St Louis

Sat 14/11

14:54-06:55

1 stop23h 01m

$1,711

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

06:02-09:00

1 stop33h 58m

$1,810

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 9/9

09:15-20:35

2 stops26h 20m

Lambert-St Louis

Sat 19/9

08:00-06:50

2 stops31h 50m

$1,811

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 21/10

11:55-23:44

3 stops27h 49m

Lambert-St Louis

Sat 14/11

13:40-10:35

3 stops27h 55m

$2,032

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 20/1

11:50-20:59

3 stops26h 09m

Lambert-St Louis

Sat 13/2

13:30-08:35

3 stops26h 05m

$2,033

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Sat 14/11

11:50-22:15

2 stops27h 25m

Lambert-St Louis

Mon 23/11

10:53-08:35

3 stops28h 42m

$2,039

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 26/8

09:10-08:24

2 stops38h 14m

Lambert-St Louis

Sun 30/8

18:45-06:55

1 stop21h 10m

$2,077

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Wed 2/9

09:55-22:27

2 stops27h 32m

Lambert-St Louis

Thu 3/9

11:15-08:45

2 stops30h 30m

$2,099
Cheapest one-way

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Thu 24/9

09:15-08:40

2 stops38h 25m

$1,154
Fastest single journey

SydneySt. Louis

SYD Sydney Kingsford Smith - STL Lambert-St Louis

SYDSTL

Sydney Kingsford Smith

Sat 16/1

09:20-23:59

3 stops31h 39m

$1,559

Flights are sorted by cheapest return flights first.

Deals found on 10/8

Showing 1-10 of 11 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 56 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 $1,103
United Airlines
United Airlines
From $1,159
American Airlines
American Airlines
From $1,474

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 11 August 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
1,081 reviews
Check prices

Entertainment

7.2

Food

7.0

Crew

8.1

Boarding

7.7

Comfort

7.4

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
1,081 reviews
Qantas Airways
7.5
Good
1,081 reviews
Check prices

Entertainment

7.2

Food

7.0

Crew

8.1

Boarding

7.7

Comfort

7.4

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
10,103 reviews
Qantas Airways
7.5
Good
1,081 reviews
Check prices

Entertainment

7.2

Food

7.0

Crew

8.1

Boarding

7.7

Comfort

7.4

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
11,902 reviews
Qantas Airways
7.5
Good
1,081 reviews
Check prices

Entertainment

7.2

Food

7.0

Crew

8.1

Boarding

7.7

Comfort

7.4

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 $929, however they can be found for as little as $929.

  • 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 56 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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Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights to St. Charles for you. Better yet — we are completely free to use.

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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