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$578+ 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 11/18. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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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 September 17, 2025.

Round-trip from

$990
(lol.travel)

One-way from

$578
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$1,474
From Lambert-St Louis to Australia
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One-way flight from Lambert-St Louis to Australia
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Highest demand for flights based on searches. 7% potential increase in price ($118 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($34 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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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 September 17, 2025.

This lol.travel deal was found by Cheapflights users on 9/15. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/31:35 pmSTL - BNE
2 stops25h 55mUnited Airlines
Wed 11/1911:40 amBNE - STL
2 stops26h 14mUnited Airlines
Deal found 9/15$990
This United Airlines deal was found by Cheapflights users on 9/17. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/15:29 pmSTL - BNE
1 stop22h 01mUnited Airlines
Sat 11/811:40 amBNE - STL
1 stop20h 47mUnited Airlines
Deal found 9/17$1,069
This Qantas Airways deal was found by Cheapflights users on 9/15. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/226:13 pmSTL - BNE
1 stop20h 17mQantas Airways
Fri 12/269:40 amBNE - STL
2 stops23h 30mQantas Airways
Deal found 9/15$1,083
This oojo deal was found by Cheapflights users on 9/15. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/57:00 amSTL - SYD
2 stops33h 20mQantas Airways
Sun 11/232:05 pmSYD - STL
1 stop22h 25mQantas Airways
Deal found 9/15$1,104
This Expedia deal was found by Cheapflights users on 9/15. 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 12/36:55 amSTL - SYD
2 stops33h 25mQantas Airways
Wed 12/102:05 pmSYD - STL
1 stop19h 29mQantas Airways
Deal found 9/15$1,127
This oojo deal was found by Cheapflights users on 9/15. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/285:50 pmSTL - SYD
2 stops35h 05mQantas Airways
Sun 12/142:05 pmSYD - STL
1 stop22h 22mQantas Airways
Deal found 9/15$1,134
This Justfly.com deal was found by Cheapflights users on 9/17. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/296:39 amSTL - SYD
1 stop34h 21mQantas Airways
Sat 11/157:15 pmSYD - STL
2 stops34h 24mQantas Airways
Deal found 9/17$1,174
This Alaska Airlines deal was found by Cheapflights users on 9/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/304:14 pmSTL - SYD
2 stops35h 31mAlaska Airlines
Thu 11/69:40 pmSYD - STL
2 stops34h 38mAlaska Airlines
Deal found 9/15$1,176
This Gotogate deal was found by Cheapflights users on 9/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/301:35 pmSTL - SYD
2 stops27h 00mAir Canada
Thu 11/611:20 amSYD - STL
2 stops45h 09mAir Canada
Deal found 9/15$1,199
This Air Canada deal was found by Cheapflights users on 9/15. 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.
Sat 11/224:05 pmSTL - BNE
2 stops48h 40mAir Canada
Fri 12/2610:45 amBNE - STL
2 stops44h 44mAir Canada
Deal found 9/15$1,232
This United Airlines deal was found by Cheapflights users on 9/15. 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.
Sat 11/225:29 pmSTL - BNE
1 stop22h 01mUnited Airlines
Fri 12/2611:40 amBNE - STL
1 stop26h 50mUnited Airlines
Deal found 9/15$1,243
This Alaska Airlines deal was found by Cheapflights users on 9/16. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/163:57 pmSTL - SYD
2 stops35h 48mAlaska Airlines
Thu 10/239:40 pmSYD - STL
2 stops33h 21mAlaska Airlines
Deal found 9/16$1,248

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 September 17, 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

Mon 11/3

1:35 pm-7:30 am

2 stops25h 55m

Brisbane

Wed 11/19

11:40 am-9:54 pm

2 stops26h 14m

$990

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 11/1

5:29 pm-6:30 am

1 stop22h 01m

Brisbane

Sat 11/8

11:40 am-4:27 pm

1 stop20h 47m

$1,069

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 11/22

6:13 pm-6:30 am

1 stop20h 17m

Brisbane

Fri 12/26

9:40 am-5:10 pm

2 stops23h 30m

$1,083

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 10/29

6:39 am-9:00 am

1 stop34h 21m

Sydney Kingsford Smith

Sat 11/15

7:15 pm-5:08 pm

2 stops38h 53m

$1,175

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 11/22

4:05 pm-8:45 am

2 stops48h 40m

Brisbane

Fri 12/26

10:45 am-3:29 pm

2 stops44h 44m

$1,232

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 11/22

5:29 pm-7:30 am

1 stop22h 01m

Brisbane

Fri 12/26

11:40 am-10:30 pm

1 stop26h 50m

$1,243

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 10/16

3:57 pm-7:45 pm

2 stops35h 48m

Sydney Kingsford Smith

Thu 10/23

9:40 pm-3:01 pm

2 stops33h 21m

$1,248

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sat 11/1

4:34 pm-9:30 am

2 stops24h 56m

Melbourne

Sat 11/8

12:00 pm-11:42 pm

1 stop28h 42m

$1,269

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 10/29

6:39 am-12:45 pm

2 stops38h 06m

Sydney Kingsford Smith

Thu 11/13

2:00 pm-10:29 pm

2 stops25h 29m

$1,269

St. LouisCairns

STL - CNS

STLCNS

Lambert-St Louis

Sat 11/1

5:09 pm-11:00 am

2 stops26h 51m

Cairns

Sat 11/8

3:35 pm-11:42 pm

2 stops24h 07m

$1,309

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/17

Showing 1-10 of 46 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, March is the cheapest month in which you can book a flight from St. Louis to Australia (average of $1,032). Flying from St. Louis to Australia in December is currently the most expensive (average of $1,627). 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 September 17, 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 September 17, 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.
Fiji Airways
8.0
Very good
205 reviews

Overall

8.0

Boarding

8.1

Food

7.5

Comfort

8.0

Crew

8.5

Entertainment

7.4

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!!
Fiji Airways
8.0
Very good
205 reviews
Fiji Airways
8.0
Very good
205 reviews

Overall

8.0

Boarding

8.1

Food

7.5

Comfort

8.0

Crew

8.5

Entertainment

7.4

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!!
Air New Zealand
8.0
Very good
505 reviews
Fiji Airways
8.0
Very good
205 reviews

Overall

8.0

Boarding

8.1

Food

7.5

Comfort

8.0

Crew

8.5

Entertainment

7.4

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!!
Qantas Airways
7.5
Good
907 reviews
Fiji Airways
8.0
Very good
205 reviews

Overall

8.0

Boarding

8.1

Food

7.5

Comfort

8.0

Crew

8.5

Entertainment

7.4

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!!
United Airlines
7.4
Good
8,926 reviews
Fiji Airways
8.0
Very good
205 reviews

Overall

8.0

Boarding

8.1

Food

7.5

Comfort

8.0

Crew

8.5

Entertainment

7.4

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!!
American Airlines
7.2
Good
10,000 reviews
Fiji Airways
8.0
Very good
205 reviews

Overall

8.0

Boarding

8.1

Food

7.5

Comfort

8.0

Crew

8.5

Entertainment

7.4

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 20h 17m. 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?

    The most popular flight routes from St. Louis to Australia are Lambert-St Louis - Melbourne, Lambert-St Louis - Sydney Kingsford Smith and Lambert-St Louis - Melbourne Avalon.

  • 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, March is the cheapest month in which you can book a flight from St. Louis to Australia (average of $1,032). Flying from St. Louis to Australia in December is currently the most expensive (average of $1,627). 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

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Alternative routes for St. Louis to Australia

See prices for flight routes from nearby airports that may be better suited for you.
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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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$687Average$1,396FlexibilityNo cancel feeOn-time74%
Fiji AirwaysCheapest$887Average$1,296FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$897Average$1,281FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$1,029Average$1,558FlexibilityNo cancel feeOn-time69%
Air New ZealandCheapest$1,173Average$1,655FlexibilityNo cancel feeOn-time78%
American AirlinesCheapest$1,260Average$1,489FlexibilityNo cancel feeOn-time71%

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