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$764+ 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 7/3. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
16 Oct — 23 Oct1
1 adult
1 adult, Economy

Flights to St. Charles in 2025

Find the latest flights to St. Charles in 2025, 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 September 2025.

Return from

$1,214

One-way from

$764

Popular in

January

Cheapest in

November

Average price

$2,047
Air Canada
  • Air Canada
  • 12/3-16/3
  • 4 total stops
  • 93h 39m total
  • Sydney to St. Louis
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United Airlines
  • United Airlines
  • 7/3
  • 1 total stop
  • 37h 52m total
  • Sydney to St. Charles
Search Deals
Highest demand for flights based on searches. 14% potential increase in price ($505 potential increase over avg. return price).
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Cheapest flight prices on average. 1% potential price decrease ($53 potential savings vs. average return price).
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Average for return flights in September 2025
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Find flight deals to St. Charles

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 September 2025.

Thu 4/1216:00SYD - STL
2 stops64h 29mAir Canada
Tue 9/1209:00STL - SYD
2 stops31h 35mAir Canada
Deal found 15/9$1,246
Wed 3/1211:20SYD - STL
2 stops29h 36mAmerican Airlines
Fri 12/1214:37STL - SYD
2 stops25h 23mAmerican Airlines
Deal found 15/9$1,250
Thu 4/1211:20SYD - STL
2 stops26h 37mAir Canada
Mon 8/1216:05STL - SYD
2 stops45h 50mAir Canada
Deal found 15/9$1,255
Thu 30/1011:20SYD - STL
2 stops22h 18mAmerican Airlines
Thu 6/1114:29STL - SYD
2 stops25h 31mAmerican Airlines
Deal found 15/9$1,268
Mon 1/1211:50SYD - STL
1 stop39h 14mUnited Airlines
Mon 8/1206:15STL - SYD
1 stop31h 45mUnited Airlines
Deal found 15/9$1,276
Wed 3/1210:40SYD - STL
2 stops38h 45mDelta
Tue 9/1218:06STL - SYD
2 stops69h 24mDelta
Deal found 15/9$1,277
Thu 4/1216:00SYD - STL
2 stops64h 29mAir Canada
Fri 12/1209:00STL - SYD
2 stops52h 55mAir Canada
Deal found 15/9$1,346
Mon 1/1211:20SYD - STL
2 stops28h 09mAmerican Airlines
Fri 12/1206:55STL - SYD
1 stop33h 05mAmerican Airlines
Deal found 15/9$1,351
Wed 3/1211:50SYD - STL
1 stop21h 14mUnited Airlines
Tue 9/1216:45STL - SYD
2 stops23h 20mUnited Airlines
Deal found 15/9$1,436
Sun 30/1114:05SYD - STL
1 stop19h 27mAmerican Airlines
Sun 7/1214:37STL - SYD
2 stops25h 23mAmerican Airlines
Deal found 15/9$1,451
Mon 1/1216:00SYD - STL
2 stops40h 29mAir Canada
Thu 11/1213:35STL - SYD
2 stops27h 00mAir Canada
Deal found 15/9$1,496

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 September 2025.
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

Thu 12/3

10:20-15:29

2 stops45h 09m

Lambert-St Louis

Mon 16/3

16:05-08:35

2 stops48h 30m

$1,214

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 4/12

11:20-20:57

2 stops26h 37m

Lambert-St Louis

Mon 8/12

16:05-06:55

2 stops45h 50m

$1,255

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 1/12

11:50-22:22

1 stop27h 32m

Lambert-St Louis

Mon 8/12

15:19-09:05

2 stops24h 46m

$1,276

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 1/12

11:50-10:04

1 stop39h 14m

Lambert-St Louis

Tue 9/12

16:45-09:05

2 stops23h 20m

$1,276

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 2/12

12:10-16:27

1 stop21h 17m

Lambert-St Louis

Tue 9/12

17:30-09:15

1 stop22h 45m

$1,276

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 3/12

10:40-08:25

2 stops38h 45m

Lambert-St Louis

Tue 9/12

18:06-08:30

2 stops69h 24m

$1,277

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 3/12

11:50-22:45

2 stops27h 55m

Lambert-St Louis

Wed 10/12

09:00-09:15

2 stops31h 15m

$1,277

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 2/12

12:10-22:45

2 stops27h 35m

Lambert-St Louis

Mon 8/12

15:19-09:05

3 stops48h 46m

$1,277

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 7/3

10:40-19:14

2 stops25h 34m

$764

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 7/3

11:50-08:42

1 stop37h 52m

$764

Flights are sorted by cheapest return flights first.

Deals found on 15/9

Showing 1-10 of 11 results
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 24 hours 31 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, Air Canada and Qantas Airways.

United Airlines
United Airlines
From $818
Qantas Airways
Qantas Airways
From $990
Air Canada
Air Canada
From $758
Air New Zealand
Air New Zealand
From $976

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 16 September 2025.
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
905 reviews
Check prices

Entertainment

7.2

Overall

7.5

Food

6.9

Boarding

7.7

Comfort

7.5

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.
Qantas Airways
7.5
Good
905 reviews
Qantas Airways
7.5
Good
905 reviews
Check prices

Entertainment

7.2

Overall

7.5

Food

6.9

Boarding

7.7

Comfort

7.5

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.
United Airlines
7.4
Good
8,929 reviews
Qantas Airways
7.5
Good
905 reviews
Check prices

Entertainment

7.2

Overall

7.5

Food

6.9

Boarding

7.7

Comfort

7.5

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.
Air Canada
7.1
Good
10,000 reviews
Qantas Airways
7.5
Good
905 reviews
Check prices

Entertainment

7.2

Overall

7.5

Food

6.9

Boarding

7.7

Comfort

7.5

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,July 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.

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.

  • How much is a return flight to St. Charles?

    A return flight to St. Charles will typically cost around $376, however they can be found for as little as $296.

  • Where does the fastest flight to St. Charles depart from?

    For those looking to save time traveling to St. Charles, Melbourne offers the quickest one-way flight (23 hours 16 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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