Australia

$527+ Cheap flights from St. Louis (STL) to Australia

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 10/31. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Aug 23 — Aug 301
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Cheap flight deals from St. Louis to Australia

Keep the following information in mind while searching for St. Louis to Australia flight deals. Data was last updated August 18, 2025.

Round-trip from

$992
(Expedia)

One-way from

$527
(Trip.com)

Popular in

December

Cheapest in

August

Average price

$1,257
From Lambert-St Louis to Australia
One-way flight from Lambert-St Louis to Australia
Highest demand for flights based on searches. 5% potential increase in price ($92 potential increase over avg. RT price).
Cheapest flight prices on average. 2% potential price decrease ($34 potential savings vs. average RT price).
Average for round-trip flights in August 2025

Find flight deals from St. Louis to Australia

Cheapest flights from St. Louis to Australia
Explore the most affordable flight options available from St. Louis to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 18, 2025.

This Expedia deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/199:00 amSTL - BNE
2 stops31h 45mAir Canada
Tue 11/2510:45 amBNE - STL
2 stops44h 44mAir Canada
Deal found 8/18$992
This Air Canada deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/74:05 pmSTL - BNE
2 stops48h 40mAir Canada
Mon 11/2410:45 amBNE - STL
2 stops44h 44mAir Canada
Deal found 8/17$994
This FlightHub deal was found by Cheapflights users on 8/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/71:20 pmSTL - BNE
1 stop25h 10mQantas Airways
Mon 11/249:40 amBNE - STL
1 stop18h 57mQantas Airways
Deal found 8/17$1,021
This Air Canada deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/194:05 pmSTL - BNE
2 stops48h 40mMultiple Airlines
Tue 11/256:10 amBNE - STL
3 stops49h 19mMultiple Airlines
Deal found 8/18$1,047
This FlightHub deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/187:00 amSTL - BNE
1 stop30h 00mQantas Airways
Tue 11/257:25 pmBNE - STL
1 stop20h 17mQantas Airways
Deal found 8/18$1,060
This Air Canada deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/179:00 amSTL - BNE
2 stops31h 45mAir Canada
Thu 11/2710:45 amBNE - STL
2 stops44h 44mAir Canada
Deal found 8/18$1,063
This United Airlines deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/175:29 pmSTL - BNE
1 stop22h 01mUnited Airlines
Thu 11/2711:40 amBNE - STL
1 stop20h 47mUnited Airlines
Deal found 8/18$1,067
This FlightHub deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/111:55 pmSTL - MEL
1 stop22h 05mQantas Airways
Sat 1/178:50 amMEL - STL
2 stops32h 09mQantas Airways
Deal found 8/16$1,076
This Air Canada deal was found by Cheapflights users on 8/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/174:43 pmSTL - BNE
2 stops24h 02mAir Canada
Wed 11/2612:05 pmBNE - STL
3 stops67h 24mAir Canada
Deal found 8/18$1,086
This FlightHub deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/43:59 pmSTL - SYD
1 stop21h 56mQantas Airways
Tue 11/255:30 pmSYD - STL
2 stops23h 12mQantas Airways
Deal found 8/16$1,088
This FlightHub deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/284:07 pmSTL - SYD
1 stop21h 48mQantas Airways
Sun 12/147:20 amSYD - STL
2 stops25h 47mQantas Airways
Deal found 8/16$1,092
This FlightHub deal was found by Cheapflights users on 8/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/243:59 pmSTL - SYD
1 stop21h 56mQantas Airways
Mon 12/85:30 pmSYD - STL
2 stops23h 42mQantas Airways
Deal found 8/16$1,104

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Australia 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 2,558,603 searches. Data last updated August 18, 2025.
Use the filters below to find and compare flights from St. Louis to Australia that are best for you.

Fly from

St. Louis

Fly to

Australia

Route

Depart

Return

Price

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Wed 11/19

9:00 am-8:45 am

2 stops31h 45m

Brisbane

Tue 11/25

10:45 am-3:29 pm

2 stops44h 44m

$992

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Fri 11/7

4:05 pm-8:45 am

2 stops48h 40m

Brisbane

Mon 11/24

10:45 am-3:29 pm

2 stops44h 44m

$994

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Tue 2/3

4:05 pm-8:45 am

2 stops48h 40m

Brisbane

Tue 2/10

10:45 am-3:29 pm

2 stops44h 44m

$994

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Tue 2/3

4:07 pm-6:30 am

1 stop22h 23m

Brisbane

Tue 2/10

9:40 am-4:14 pm

1 stop22h 34m

$1,021

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Fri 11/7

1:20 pm-6:30 am

1 stop25h 10m

Brisbane

Mon 11/24

9:40 am-12:37 pm

1 stop18h 57m

$1,021

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Wed 11/19

4:05 pm-8:45 am

2 stops48h 40m

Brisbane

Tue 11/25

6:10 am-3:29 pm

3 stops49h 19m

$1,047

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Tue 11/18

7:00 am-5:00 am

1 stop30h 00m

Brisbane

Tue 11/25

7:25 pm-11:42 pm

1 stop20h 17m

$1,060

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 11/17

9:00 am-8:45 am

2 stops31h 45m

Brisbane

Thu 11/27

10:45 am-3:29 pm

2 stops44h 44m

$1,063

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 11/17

9:00 am-8:45 am

2 stops31h 45m

Brisbane

Mon 11/24

10:45 am-3:29 pm

2 stops44h 44m

$1,063

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Tue 11/18

4:55 pm-8:45 am

2 stops23h 50m

Brisbane

Tue 11/25

10:45 am-3:29 pm

2 stops44h 44m

$1,063

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/16

Showing 1-10 of 45 results
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Best time to book a flight from St. Louis to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia from St. Louis with our price prediction graph.
Estimated round-trip 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 St. Louis to Australia

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

Currently, February is the cheapest month in which you can book a flight from St. Louis to Australia (average of $1,031). Flying from St. Louis to Australia in December is currently the most expensive (average of $1,619). 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.

What is the cheapest time of day to fly from STL to AU?

Find hourly flight availability from St. Louis to Australia. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 18, 2025.

When flying from St. Louis to Australia, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing Australia

Get insights into the airlines that provide service to Australia. 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 Australia. Reviews last updated August 18, 2025.
Read reviews from past customers who have flown Fiji Airways, Air New Zealand, and Qantas Airways from St. Louis to Australia. 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.

Comfort

8.0

Entertainment

7.4

Food

7.5

Crew

8.5

Overall

8.0

Boarding

8.1

Reviews

1 / 16
6.0
Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!

Comfort

8.0

Entertainment

7.4

Food

7.5

Crew

8.5

Overall

8.0

Boarding

8.1

Reviews

1 / 16
6.0
Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!

Comfort

8.0

Entertainment

7.4

Food

7.5

Crew

8.5

Overall

8.0

Boarding

8.1

Reviews

1 / 16
6.0
Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!

Comfort

8.0

Entertainment

7.4

Food

7.5

Crew

8.5

Overall

8.0

Boarding

8.1

Reviews

1 / 16
6.0
Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!

Comfort

8.0

Entertainment

7.4

Food

7.5

Crew

8.5

Overall

8.0

Boarding

8.1

Reviews

1 / 16
6.0
Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!

Comfort

8.0

Entertainment

7.4

Food

7.5

Crew

8.5

Overall

8.0

Boarding

8.1

Reviews

1 / 16
6.0
Good

Christopher,Jun 2025

LAX - NAN

No attempt to make you comfortable. All they care about is how can they pack more people on the plane and how can they charge you for as much as possible. I find it invasive and discriminatory that you weigh my carryon (or any of my naggage frankly). If I physically weighed 15kilos more and my bag weighed under your stupid and arbitrary weight limit I would not be charged... but if I'm a person who is skinny and weighs less, well heaven forbid my bag is 1 kilo heavier than you wish!! $$$ VERY VERY DISCRIMINATORY POLICY!! NEXT TIME I'LL TRY TO EAT MY BAGGAGE SO THAT I CAN TAKE ON AS MUCH WEIGHT AS I WANT! Yeah... sounds ridiculous doesn't it!? No more ridiculous than you charging more for people who bring more baggage weight while letting obese people carry on all the weight they want! It just proves it has absolutely nothing to do with safety, or even your operating costs... Just squeezing as much money out of us as possible!!

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Australia. 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 from for flights from St. Louis to Australia?

    For a flight from St. Louis to Australia, you will be flying from Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city.

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

    Departing from St. Louis to Australia will take you 22h 23m. Airlines will cover a distance of 8745 mi. Both multi-stop and nonstop flights can be found to your destination and back.

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

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

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

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

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

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

    Yes. Cheapflights offers flight deals from St. Louis to Australia 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 St. Louis to Australia?

    Currently, February is the cheapest month in which you can book a flight from St. Louis to Australia (average of $1,031). Flying from St. Louis to Australia in December is currently the most expensive (average of $1,619). 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

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Top 6 airlines flying from St. Louis to Australia

Discover the top 6 airlines that operate flights from St. Louis to Australia. 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 2,558,603 searches. Data last updated August 18, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$687Average$1,526FlexibilityNo cancel feeOn-time74%
Fiji AirwaysCheapest$887Average$1,287FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$1,029Average$1,568FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$1,078Average$1,339FlexibilityNo cancel feeOn-time67%
Air New ZealandCheapest$1,173Average$1,655FlexibilityNo cancel feeOn-time78%
American AirlinesCheapest$1,240Average$1,450FlexibilityNo cancel feeOn-time71%

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