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Cheap flights from Australia to St. Louis from $1,145

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 15/7. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — STL
7 May — 14 May1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Australia to St. Louis

Enter your travel dates to find the best prices.

Cheapest flights from Australia to St. Louis
Explore the most affordable flight options available from Australia to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 7 April 2026.

Wed 20/509:20
SYD
-
STL
2 stops41h 46m
Air Canada
Thu 28/513:05
STL
-
SYD
2 stops27h 15m
Air Canada
Deal found 2/4$1,723
Sun 17/509:20
SYD
-
STL
2 stops50h 23m
Air Canada
Sun 24/507:05
STL
-
SYD
2 stops57h 15m
Air Canada
Deal found 2/4$1,846
Wed 20/509:20
SYD
-
STL
2 stops22h 37m
Air Canada
Sun 24/507:05
STL
-
SYD
2 stops33h 15m
Air Canada
Deal found 2/4$1,852
Tue 19/513:15
SYD
-
STL
2 stops25h 44m
Multiple Airlines
Tue 16/606:35
STL
-
SYD
2 stops38h 15m
Multiple Airlines
Deal found 4/4$1,934
Tue 19/509:10
SYD
-
STL
1 stop29h 49m
Qantas Airways
Tue 16/606:35
STL
-
SYD
1 stop33h 30m
Qantas Airways
Deal found 7/4$2,020
Sun 17/510:00
MEL
-
STL
2 stops28h 59m
Delta
Fri 22/513:27
STL
-
MEL
2 stops27h 23m
Delta
Deal found 3/4$2,021
Sun 17/510:00
MEL
-
STL
2 stops24h 03m
Delta
Thu 21/514:27
STL
-
MEL
2 stops50h 23m
Delta
Deal found 3/4$2,025
Tue 19/518:30
SYD
-
STL
2 stops40h 00m
Qantas Airways
Tue 9/606:35
STL
-
SYD
1 stop33h 55m
Qantas Airways
Deal found 7/4$2,064
Tue 19/509:10
SYD
-
STL
2 stops23h 11m
American Airlines
Tue 16/615:01
STL
-
SYD
2 stops25h 04m
American Airlines
Deal found 6/4$2,067
Tue 19/509:10
SYD
-
STL
2 stops22h 31m
American Airlines
Tue 9/617:18
STL
-
SYD
2 stops22h 47m
American Airlines
Deal found 7/4$2,073
Thu 15/1007:00
MEL
-
STL
3 stops29h 00m
Multiple Airlines
Mon 19/1014:40
STL
-
MEL
3 stops29h 30m
Multiple Airlines
Deal found 6/4$2,189
Thu 23/706:00
MEL
-
STL
3 stops29h 07m
Air Canada
Mon 27/708:55
STL
-
MEL
3 stops35h 10m
Air Canada
Deal found 5/4$2,199

Find flight deals from Australia to St. Louis

Keep the following information in mind while searching for Australia to St. Louis flight deals. Data was last updated 7 April 2026.

Round-trip from

$1,723

One-way from

$1,145

Popular in

July

Cheapest in

September

Average price

$2,371
Air Canada
  • Air Canada
  • 20/5-28/5
  • 4 total stops
  • 69h 01m total
  • Australia to St. Louis
Search Deals
15/7
  • 15/7
  • 3 total stops
  • 58h 33m total
  • Australia to St. Louis
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($233 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($66 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Australia to St. Louis that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 7 April 2026.
Use the filters below to find and compare flights from Australia to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 17/5

09:20-12:06

2 stops41h 46m

Lambert-St Louis

Sun 24/5

13:05-07:20

3 stops51h 15m

$1,855

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Sun 17/5

10:00-19:03

2 stops24h 03m

Lambert-St Louis

Thu 21/5

14:27-07:50

2 stops50h 23m

$2,025

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 19/5

06:25-23:59

2 stops32h 34m

Lambert-St Louis

Tue 16/6

06:35-07:05

1 stop33h 30m

$2,051

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 19/5

09:30-16:39

2 stops22h 09m

Lambert-St Louis

Tue 16/6

13:38-07:00

2 stops26h 22m

$2,093

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 19/5

10:20-18:22

1 stop23h 02m

Lambert-St Louis

Tue 9/6

19:23-06:55

1 stop20h 32m

$2,099

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:10-23:59

1 stop29h 49m

Lambert-St Louis

Thu 28/5

19:20-06:55

1 stop20h 35m

$2,157

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Sun 17/5

10:20-18:22

1 stop23h 02m

Lambert-St Louis

Sun 24/5

19:23-06:55

1 stop20h 32m

$2,168

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Mon 7/9

10:55-21:22

2 stops25h 27m

Lambert-St Louis

Sun 27/9

13:27-08:15

2 stops27h 48m

$2,429

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Wed 20/5

09:20-12:06

2 stops41h 46m

Lambert-St Louis

Thu 28/5

13:05-07:20

3 stops51h 15m

$2,473

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Thu 14/5

10:55-18:22

1 stop46h 27m

Lambert-St Louis

Fri 22/5

19:23-08:15

1 stop21h 52m

$2,664

Flights are sorted by cheapest return flights first.

Deals found on 3/4

Showing 1-10 of 33 resultsSorted by cheapest first
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Best time to book a flight from Australia to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Australia 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 from Australia to St. Louis

What is the cheapest month to book a flight from Australia to St. Louis?

Currently, May is the cheapest month in which you can book a flight from Australia to St. Louis (average of $938). Flying from Australia to St. Louis in April is currently the most expensive (average of $1,649). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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. Louis. Reviews last updated 7 April 2026.
Read reviews from past customers who have flown with Qantas Airways,United Airlines, andAmerican Airlines from Australia to St. Louis. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
1,017 reviews
Check prices

Entertainment

7.2

Food

7.0

Boarding

7.7

Crew

8.1

Overall

7.5

Comfort

7.4

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
Qantas Airways
7.5
Good
1,017 reviews
Qantas Airways
7.5
Good
1,017 reviews
Check prices

Entertainment

7.2

Food

7.0

Boarding

7.7

Crew

8.1

Overall

7.5

Comfort

7.4

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
United Airlines
7.4
Good
9,546 reviews
Qantas Airways
7.5
Good
1,017 reviews
Check prices

Entertainment

7.2

Food

7.0

Boarding

7.7

Crew

8.1

Overall

7.5

Comfort

7.4

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
American Airlines
7.1
Good
11,550 reviews
Qantas Airways
7.5
Good
1,017 reviews
Check prices

Entertainment

7.2

Food

7.0

Boarding

7.7

Crew

8.1

Overall

7.5

Comfort

7.4

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.
Air Canada
7.1
Good
10,897 reviews
Qantas Airways
7.5
Good
1,017 reviews
Check prices

Entertainment

7.2

Food

7.0

Boarding

7.7

Crew

8.1

Overall

7.5

Comfort

7.4

Reviews

1 / 20
2.0
Mediocre

Midhat,Feb 2026

WYA - ADL

Frequent delays, 3rd week in a row. Flight attendants not at all friendly.

Related info for your journey

Find useful and relevant information for your journey from Australia to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to St. Louis from Australia?

    Most people fly into Lambert-St Louis (STL) if they book a flight to St. Louis from Australia. Lambert-St Louis is conveniently located just 20.4 km from St. Louis’s city centre.

  • How long is the flight from Australia to St. Louis?

    Air Canada, Delta, and Qantas Airways can get you from Australia to St. Louis in just under 24h 03m. Your travel time can differ by up to 17h 43m. Airlines will cover a distance of 15255 km. Both multi-stop and direct flights can be found to your destination and back.

  • What are the most popular routes from Australia to St. Louis?

    Most travellers choose Melbourne - Lambert-St Louis, Sydney Kingsford Smith - Lambert-St Louis or Launceston - Lambert-St Louis when deciding on the best route from Australia to St. Louis.

  • Can I find deals for flights from Australia to St. Louis that include hotel bookings?

    Yes. In addition to deals on Australia to St. Louis flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Australia to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Australia to St. Louis.

  • Can I find deals for business class flights from Australia to St. Louis?

    Yes. Cheapflights offers flight deals from Australia to St. Louis by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Australia to St. Louis?

    Currently, May is the cheapest month in which you can book a flight from Australia to St. Louis (average of $938). Flying from Australia to St. Louis in April is currently the most expensive (average of $1,649). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 4 airlines flying from Australia to St. Louis

Discover the top 4 airlines that operate flights from Australia to St. Louis. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 647,157 searches. Data last updated 7 April 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$770Average$1,854FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest$1,058Average$1,533FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
Qantas AirwaysCheapest$1,126Average$2,000FlexibilityNo cancel feeOn-time74%
Search Qantas Airways flights
American AirlinesCheapest$1,666Average$1,813FlexibilityNo cancel feeOn-time71%
Search American Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Australia to St. Louis?

When you search for this flight from Australia to St. Louis, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Australia to St. Louis?

Cheapflights simply makes it quick and affordable to book flights from Australia to St. Louis by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Australia to St. Louis with no change fees?

Users can book flights with no change fees policies with our dedicated filters. Book flights from Australia to St. Louis flexibly with Cheapflights today.

Can Cheapflights notify me if prices for flights from Australia to St. Louis become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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