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$596+ 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 1/30. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Dec 9 — Dec 161
Tue 12/9
Tue 12/16
1 adult, Economy
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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 November 9, 2025.

This Air Canada deal was found by Cheapflights users on 11/9. 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 11/221:35 pmSTL - BNE
2 stops27h 10mMultiple Airlines
Fri 12/2610:45 amBNE - STL
2 stops44h 44mMultiple Airlines
Deal found 11/9$1,006
This FlightHub deal was found by Cheapflights users on 11/8. 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.
Sat 11/226:13 pmSTL - BNE
1 stop20h 17mQantas Airways
Fri 12/267:40 pmBNE - STL
1 stop20h 11mQantas Airways
Deal found 11/8$1,040
This American Airlines deal was found by Cheapflights users on 11/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/227:00 amSTL - BNE
1 stop30h 00mAmerican Airlines
Fri 12/267:40 pmBNE - STL
2 stops20h 11mAmerican Airlines
Deal found 11/8$1,049
This American Airlines deal was found by Cheapflights users on 11/8. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/119:30 amSTL - BNE
1 stop29h 00mAmerican Airlines
Sun 12/149:40 amBNE - STL
1 stop18h 54mAmerican Airlines
Deal found 11/8$1,058
This oojo deal was found by Cheapflights users on 11/7. 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 11/127:00 amSTL - SYD
2 stops33h 20mQantas Airways
Sun 11/232:05 pmSYD - STL
1 stop19h 27mQantas Airways
Deal found 11/7$1,071
This oojo deal was found by Cheapflights users on 11/7. 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 11/283:59 pmSTL - SYD
2 stops37h 26mQantas Airways
Sun 12/142:05 pmSYD - STL
1 stop22h 22mQantas Airways
Deal found 11/7$1,094
This Gotogate deal was found by Cheapflights users on 11/8. 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 12/111:35 pmSTL - BNE
2 stops27h 10mAir Canada
Sun 12/1410:45 amBNE - STL
2 stops41h 54mAir Canada
Deal found 11/8$1,097
This oojo deal was found by Cheapflights users on 11/8. 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.
Sat 11/153:59 pmSTL - SYD
1 stop21h 56mQantas Airways
Sat 11/226:05 amSYD - STL
2 stops26h 24mQantas Airways
Deal found 11/8$1,103
This oojo deal was found by Cheapflights users on 11/8. 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 11/127:00 amSTL - SYD
2 stops33h 20mQantas Airways
Fri 11/142:05 pmSYD - STL
1 stop22h 25mQantas Airways
Deal found 11/8$1,251
This Justfly.com deal was found by Cheapflights users on 11/9. 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.
Thu 12/111:20 pmSTL - SYD
2 stops38h 30mQantas Airways
Thu 12/1811:20 amSYD - STL
1 stop29h 31mQantas Airways
Deal found 11/9$1,259
This oojo deal was found by Cheapflights users on 11/9. 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.
Tue 11/113:59 pmSTL - MEL
2 stops38h 01mCathay Pacific
Wed 12/33:35 pmMEL - STL
2 stops49h 22mCathay Pacific
Deal found 11/9$1,385
This oojo deal was found by Cheapflights users on 11/9. 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 12/101:20 pmSTL - MEL
1 stop22h 40mQantas Airways
Thu 1/86:30 pmMEL - STL
2 stops37h 17mQantas Airways
Deal found 11/9$1,404

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 November 9, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$969
(Expedia)

One-way from

$596
(Kiwi.com)

Popular in

December

Cheapest in

August

Average price

$1,361
Provider with most accurate pricing for Lambert-St Louis-Sydney Kingsford Smith flight deals.
Search Deals
Provider most trusted by Cheapflights users for Lambert-St Louis-Sydney Kingsford Smith flights.
Search Deals
From Lambert-St Louis to Australia
Search Deals
One-way flight from Lambert-St Louis to Australia
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($87 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in November 2025
Search Deals

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 November 9, 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 1/19

2:45 pm-8:45 am

2 stops26h 00m

Brisbane

Wed 2/4

10:45 am-3:29 pm

2 stops44h 44m

$969

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 1/19

2:45 pm-8:45 am

2 stops26h 00m

Brisbane

Wed 2/4

6:10 am-3:29 pm

3 stops49h 19m

$986

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 11/22

1:35 pm-8:45 am

2 stops27h 10m

Brisbane

Fri 12/26

10:45 am-3:29 pm

2 stops44h 44m

$1,006

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 2/16

2:22 pm-8:20 am

2 stops25h 58m

Brisbane

Fri 2/20

10:40 am-8:41 pm

2 stops26h 01m

$1,041

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-3:00 pm

1 stop21h 20m

$1,046

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 11/22

7:00 am-5:00 am

1 stop30h 00m

Brisbane

Fri 12/26

9:40 am-4:23 pm

2 stops22h 43m

$1,056

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Thu 12/11

9:30 am-6:30 am

1 stop29h 00m

Brisbane

Sun 12/14

9:40 am-12:34 pm

1 stop18h 54m

$1,058

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/12

7:00 am-9:20 am

2 stops33h 20m

Sydney Kingsford Smith

Sun 11/23

2:05 pm-4:32 pm

1 stop19h 27m

$1,071

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 11/28

3:59 pm-10:25 pm

2 stops37h 26m

Sydney Kingsford Smith

Sun 12/14

2:05 pm-5:05 pm

1 stop20h 00m

$1,094

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 11/15

3:59 pm-6:55 am

1 stop21h 56m

Sydney Kingsford Smith

Sat 11/22

6:05 am-3:29 pm

2 stops26h 24m

$1,103

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/8

Showing 1-10 of 39 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, August is the cheapest month in which you can book a flight from St. Louis to Australia (average of $705). Flying from St. Louis to Australia in June is currently the most expensive (average of $1,257). 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 November 9, 2025.

When flying from St. Louis to Australia, the time of day you fly usually plays a role in the price. Save by searching for a flight at noon, which can drop the price by up to 11% versus a flight in the morning.

What is the cheapest day to fly from St. Louis to Australia?

Use this chart to determine the cheapest time to fly round-trip from St. Louis to Australia. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their St. Louis to Australia flight should consider departing on Sunday afternoons when fares are most often at their lowest. Saturday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

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 November 9, 2025.
Read reviews from past customers who have flown Fiji Airways, Qantas Airways, and United Airlines 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
8.1
Very good
209 reviews

Food

7.5

Entertainment

7.5

Overall

8.1

Comfort

8.0

Boarding

8.2

Crew

8.5

Reviews

1 / 17
10.0
Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.
Fiji Airways
8.1
Very good
209 reviews
Fiji Airways
8.1
Very good
209 reviews

Food

7.5

Entertainment

7.5

Overall

8.1

Comfort

8.0

Boarding

8.2

Crew

8.5

Reviews

1 / 17
10.0
Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.
Qantas Airways
7.5
Good
930 reviews
Fiji Airways
8.1
Very good
209 reviews

Food

7.5

Entertainment

7.5

Overall

8.1

Comfort

8.0

Boarding

8.2

Crew

8.5

Reviews

1 / 17
10.0
Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.
United Airlines
7.4
Good
9,012 reviews
Fiji Airways
8.1
Very good
209 reviews

Food

7.5

Entertainment

7.5

Overall

8.1

Comfort

8.0

Boarding

8.2

Crew

8.5

Reviews

1 / 17
10.0
Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.
American Airlines
7.2
Good
11,044 reviews
Fiji Airways
8.1
Very good
209 reviews

Food

7.5

Entertainment

7.5

Overall

8.1

Comfort

8.0

Boarding

8.2

Crew

8.5

Reviews

1 / 17
10.0
Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.
Air Canada
7.1
Good
10,428 reviews
Fiji Airways
8.1
Very good
209 reviews

Food

7.5

Entertainment

7.5

Overall

8.1

Comfort

8.0

Boarding

8.2

Crew

8.5

Reviews

1 / 17
10.0
Excellent

Anonymous,Oct 2025

CNS - NAN

Food service: Outstanding. Comfort of seating and usual things: Also outstanding.

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 25h 58m. 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 cheapest airlines to fly from St. Louis to Australia one-way?

    To fly one-way, consider booking your trip with Qantas Airways, which is currently one of the cheapest options available, starting at $722. American Airlines flights start at $862 while deals on United Airlines start at $1,039 one-way.

  • 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, August is the cheapest month in which you can book a flight from St. Louis to Australia (average of $705). Flying from St. Louis to Australia in June is currently the most expensive (average of $1,257). 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 November 9, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$897Average$1,281FlexibilityNo cancel feeOn-time67%
Qantas AirwaysCheapest$975Average$1,370FlexibilityNo cancel feeOn-time74%
Fiji AirwaysCheapest$1,132Average$1,296FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$1,165Average$1,556FlexibilityNo cancel feeOn-time69%
Air New ZealandCheapest$1,259Average$1,437FlexibilityNo cancel feeOn-time78%
American AirlinesCheapest$1,260Average$1,501FlexibilityNo cancel feeOn-time71%

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