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$838+ 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 26/8. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
16 Jul — 23 Jul1
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 16 June 2026.

Fri 28/809:10
SYD
-
STL
2 stops47h 27m
American Airlines
Mon 7/905:42
STL
-
SYD
1 stop34h 13m
American Airlines
Deal found 14/6$1,389
Wed 26/809:10
SYD
-
STL
1 stop28h 49m
American Airlines
Tue 8/906:36
STL
-
SYD
2 stops33h 29m
American Airlines
Deal found 12/6$1,412
Wed 26/809:10
SYD
-
STL
2 stops22h 31m
American Airlines
Wed 2/906:36
STL
-
SYD
2 stops33h 29m
American Airlines
Deal found 14/6$1,413
Wed 26/809:10
SYD
-
STL
1 stop28h 49m
American Airlines
Sun 6/918:45
STL
-
SYD
1 stop21h 10m
American Airlines
Deal found 12/6$1,423
Wed 26/812:00
SYD
-
STL
1 stop23h 26m
American Airlines
Mon 7/906:00
STL
-
SYD
1 stop34h 05m
American Airlines
Deal found 14/6$1,425
Thu 27/817:50
SYD
-
STL
1 stop20h 09m
American Airlines
Mon 7/906:36
STL
-
SYD
1 stop33h 19m
American Airlines
Deal found 14/6$1,435
Wed 26/810:20
SYD
-
STL
1 stop23h 19m
United Airlines
Mon 7/912:59
STL
-
SYD
2 stops27h 01m
United Airlines
Deal found 14/6$1,439
Wed 26/809:10
SYD
-
STL
1 stop28h 49m
Qantas Airways
Wed 9/906:30
STL
-
SYD
1 stop33h 35m
Qantas Airways
Deal found 12/6$1,477
Sat 29/812:00
SYD
-
STL
1 stop19h 14m
Qantas Airways
Mon 7/915:32
STL
-
SYD
1 stop24h 23m
Qantas Airways
Deal found 14/6$1,478
Tue 25/809:10
SYD
-
STL
1 stop28h 49m
Qantas Airways
Mon 7/906:00
STL
-
SYD
1 stop34h 30m
Qantas Airways
Deal found 14/6$1,480
Wed 26/809:10
SYD
-
STL
1 stop28h 49m
American Airlines
Thu 3/906:00
STL
-
SYD
1 stop34h 05m
American Airlines
Deal found 12/6$1,481

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 16 June 2026.

Return from

$1,389

One-way from

$838

Popular in

July

Cheapest in

September

Average price

$2,049
American Airlines
  • American Airlines
  • 28/8-7/9
  • 3 total stops
  • 81h 40m total
  • Sydney to St. Louis
Search Deals
Delta
  • Delta
  • 26/8
  • 2 total stops
  • 24h 40m total
  • Sydney to St. Charles
Search Deals
Highest demand for flights based on searches. 9% potential increase in price ($203 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($61 potential savings vs. average return price).
Search Deals
Average for return flights in June 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 16 June 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

Thu 30/7

09:20-18:42

2 stops48h 22m

Lambert-St Louis

Mon 3/8

12:10-07:20

2 stops52h 10m

$1,508

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 6/8

09:10-22:59

1 stop28h 49m

Lambert-St Louis

Mon 10/8

08:36-07:05

2 stops31h 29m

$1,548

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 8/7

09:10-19:26

2 stops25h 16m

Lambert-St Louis

Mon 20/7

09:08-07:05

2 stops30h 57m

$1,614

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 7/8

09:20-20:22

2 stops26h 02m

Lambert-St Louis

Tue 11/8

08:55-07:20

2 stops31h 25m

$1,678
Fastest return journey

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 30/7

10:20-18:17

1 stop22h 57m

Lambert-St Louis

Mon 3/8

19:23-06:55

1 stop20h 32m

$1,697

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 6/8

09:30-17:42

2 stops23h 12m

Lambert-St Louis

Mon 10/8

16:48-06:55

2 stops23h 07m

$1,706

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 7/8

17:50-22:59

1 stop20h 09m

Lambert-St Louis

Tue 11/8

13:25-07:05

2 stops26h 40m

$1,733

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 29/8

10:20-15:38

2 stops44h 18m

Lambert-St Louis

Fri 4/9

08:42-06:55

1 stop31h 13m

$1,806

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Fri 28/8

10:20-18:39

1 stop23h 19m

Lambert-St Louis

Thu 3/9

08:42-06:55

1 stop31h 13m

$1,806

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 29/8

09:10-22:59

1 stop28h 49m

Lambert-St Louis

Sat 5/9

17:11-13:25

2 stops29h 14m

$1,836

Flights are sorted by cheapest return flights first.

Deals found on 15/6

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 19 hours 14 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 $1,040
Qantas Airways
Qantas Airways
From $1,101
American Airlines
American Airlines
From $1,629
Air Canada
Air Canada
From $1,034

What are the cheapest airlines that fly to St. Charles?

The cheapest airlines flying from Sydney to St. Charles are United Airlines, Qantas Airways and American Airlines.

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 16 June 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
1,047 reviews
Check prices

Overall

7.5

Comfort

7.5

Food

7.0

Boarding

7.7

Crew

8.1

Entertainment

7.2

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
1,047 reviews
Qantas Airways
7.5
Good
1,047 reviews
Check prices

Overall

7.5

Comfort

7.5

Food

7.0

Boarding

7.7

Crew

8.1

Entertainment

7.2

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
9,842 reviews
Qantas Airways
7.5
Good
1,047 reviews
Check prices

Overall

7.5

Comfort

7.5

Food

7.0

Boarding

7.7

Crew

8.1

Entertainment

7.2

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
11,667 reviews
Qantas Airways
7.5
Good
1,047 reviews
Check prices

Overall

7.5

Comfort

7.5

Food

7.0

Boarding

7.7

Crew

8.1

Entertainment

7.2

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, 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, Sydney Kingsford Smith offers the quickest one-way flight (19 hours 14 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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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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