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$1,683+ 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 18/8. Fares are subject to change and may not be available on all flights or dates of travel.
— STL
3 Apr — 10 Apr1
1 adult

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 29 March 2025.

Return from

$1,683

One-way from

$4,389

Popular in

August

Cheapest in

March

Average price

$1,897
Air Canada
  • Air Canada
  • 18/8-8/11
  • 4 total stops
  • 93h 21m total
  • Sydney to St. Louis
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26/4
  • 26/4
  • 3 total stops
  • 58h 48m total
  • Sydney to St. Charles
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($310 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($147 potential savings vs. average return price).
Search Deals
Average for return flights in March 2025
Search Deals

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 29 March 2025.

Mon 18/809:20SYD - STL
2 stops45h 01mAir Canada
Sat 8/1116:15STL - SYD
2 stops48h 20mAir Canada
Deal found 28/3$1,683
Mon 16/610:20SYD - STL
1 stop22h 40mUnited Airlines
Wed 2/713:42STL - SYD
2 stops26h 13mUnited Airlines
Deal found 28/3$2,099
Wed 18/609:10SYD - STL
1 stop28h 49mQantas Airways
Wed 2/706:30STL - SYD
1 stop33h 35mQantas Airways
Deal found 28/3$2,234
Mon 18/812:10SYD - STL
2 stops24h 39mMultiple Airlines
Sat 8/1113:55STL - SYD
3 stops26h 25mMultiple Airlines
Deal found 28/3$2,824

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 March 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

Mon 18/8

09:20-15:21

2 stops45h 01m

Lambert-St Louis

Sat 8/11

16:15-09:35

2 stops48h 20m

$1,683

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 16/6

10:20-18:00

1 stop22h 40m

Lambert-St Louis

Wed 2/7

13:42-06:55

2 stops26h 13m

$2,099

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 18/6

09:10-22:59

1 stop28h 49m

Lambert-St Louis

Wed 2/7

06:30-07:05

1 stop33h 35m

$2,234

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Mon 18/8

12:10-21:49

2 stops24h 39m

Lambert-St Louis

Sat 8/11

13:55-09:20

3 stops26h 25m

$2,824

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 26/4

18:20-14:08

3 stops58h 48m

$4,389

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 26/4

08:55-23:16

2 stops53h 21m

$5,506

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sat 26/4

10:20-16:54

1 stop21h 34m

$10,596

Flights are sorted by cheapest return flights first.

Deals found on 28/3

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 11 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 $968

Qantas Airways

Qantas Airways

From $1,127

Air Canada

Air Canada

From $984

American Airlines

American Airlines

From $965

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

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

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 March 2025.
Japan Airlines
8.3
Very Good
1,440 reviews
Check prices

Overall

8.3

Boarding

8.4

Entertainment

7.8

Comfort

8.2

Crew

8.7

Food

7.7

Reviews

1 / 20
10.0
Excellent

L,Nov 2024

SNA - SEA

Excellent crew, great food and decent audio selection. Seats are wide and have plenty of leg room but could use some more padding.
Japan Airlines
8.3
Very Good
1,440 reviews
Japan Airlines
8.3
Very Good
1,440 reviews
Check prices

Overall

8.3

Boarding

8.4

Entertainment

7.8

Comfort

8.2

Crew

8.7

Food

7.7

Reviews

1 / 20
10.0
Excellent

L,Nov 2024

SNA - SEA

Excellent crew, great food and decent audio selection. Seats are wide and have plenty of leg room but could use some more padding.
Qantas Airways
7.5
Good
811 reviews
Japan Airlines
8.3
Very Good
1,440 reviews
Check prices

Overall

8.3

Boarding

8.4

Entertainment

7.8

Comfort

8.2

Crew

8.7

Food

7.7

Reviews

1 / 20
10.0
Excellent

L,Nov 2024

SNA - SEA

Excellent crew, great food and decent audio selection. Seats are wide and have plenty of leg room but could use some more padding.
United Airlines
7.4
Good
8,609 reviews
Japan Airlines
8.3
Very Good
1,440 reviews
Check prices

Overall

8.3

Boarding

8.4

Entertainment

7.8

Comfort

8.2

Crew

8.7

Food

7.7

Reviews

1 / 20
10.0
Excellent

L,Nov 2024

SNA - SEA

Excellent crew, great food and decent audio selection. Seats are wide and have plenty of leg room but could use some more padding.
Air Canada
7.0
Good
8,990 reviews
Japan Airlines
8.3
Very Good
1,440 reviews
Check prices

Overall

8.3

Boarding

8.4

Entertainment

7.8

Comfort

8.2

Crew

8.7

Food

7.7

Reviews

1 / 20
10.0
Excellent

L,Nov 2024

SNA - SEA

Excellent crew, great food and decent audio selection. Seats are wide and have plenty of leg room but could use some more padding.

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, American 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 (22 hours 11 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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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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