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$545+ 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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Nov 25 — Dec 21
Tue 11/25
Tue 12/2
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 October 26, 2025.

This Air Canada deal was found by Cheapflights users on 10/26. 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 11/224:43 pmSTL - BNE
2 stops48h 02mAir Canada
Fri 12/2610:45 amBNE - STL
2 stops27h 37mAir Canada
Deal found 10/26$1,070
This United Airlines deal was found by Cheapflights users on 10/25. 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.
Fri 11/141:35 pmSTL - BNE
2 stops25h 55mUnited Airlines
Mon 11/2411:40 amBNE - STL
1 stop20h 47mUnited Airlines
Deal found 10/25$1,087
This United Airlines deal was found by Cheapflights users on 10/25. 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 11/228:20 amSTL - BNE
2 stops55h 10mUnited Airlines
Fri 12/2611:40 amBNE - STL
1 stop26h 50mUnited Airlines
Deal found 10/25$1,107
This Air Canada deal was found by Cheapflights users on 10/26. 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
3 stops53h 20mMultiple Airlines
Fri 12/2610:45 amBNE - STL
2 stops44h 44mMultiple Airlines
Deal found 10/26$1,115
This American Airlines deal was found by Cheapflights users on 10/25. 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.
Fri 11/147:00 amSTL - BNE
1 stop30h 00mAmerican Airlines
Mon 11/247:40 pmBNE - STL
1 stop20h 02mAmerican Airlines
Deal found 10/25$1,184
This Expedia deal was found by Cheapflights users on 10/24. 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.
Mon 10/274:43 pmSTL - SYD
2 stops47h 57mAir Canada
Mon 11/1011:20 amSYD - STL
2 stops42h 19mAir Canada
Deal found 10/24$1,217
This Delta deal was found by Cheapflights users on 10/25. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/22:38 pmSTL - BNE
2 stops49h 42mDelta
Fri 12/1210:40 amBNE - STL
2 stops24h 30mDelta
Deal found 10/25$1,227
This oojo deal was found by Cheapflights users on 10/24. 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 50mQantas Airways
Sun 11/232:05 pmSYD - STL
1 stop19h 27mQantas Airways
Deal found 10/24$1,241
This oojo deal was found by Cheapflights users on 10/25. 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 12/105:30 pmSTL - SYD
1 stop20h 25mQantas Airways
Wed 12/177:05 amSYD - STL
2 stops29h 24mQantas Airways
Deal found 10/25$1,254
This American Airlines deal was found by Cheapflights users on 10/24. 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.
Mon 10/276:39 amSTL - SYD
1 stop34h 21mAmerican Airlines
Mon 11/102:05 pmSYD - STL
1 stop22h 25mAmerican Airlines
Deal found 10/24$1,267
This American Airlines deal was found by Cheapflights users on 10/24. 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.
Wed 11/52:29 pmSTL - SYD
2 stops25h 31mAmerican Airlines
Sun 11/2311:20 amSYD - STL
2 stops25h 10mAmerican Airlines
Deal found 10/24$1,278
This United Airlines deal was found by Cheapflights users on 10/24. 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 10/275:29 pmSTL - SYD
1 stop23h 46mUnited Airlines
Mon 11/1012:10 pmSYD - STL
2 stops22h 29mUnited Airlines
Deal found 10/24$1,283

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 October 26, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$1,006
(Expedia)

One-way from

$545
(FlightHub)

Popular in

December

Cheapest in

August

Average price

$1,331
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. 6% potential increase in price ($94 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($29 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in October 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 October 26, 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 3/11

8:30 am-7:45 am

2 stops32h 15m

Brisbane

Mon 3/16

9:45 am-3:29 pm

2 stops44h 44m

$1,006

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Fri 11/14

5:29 pm-7:30 am

1 stop22h 01m

Brisbane

Mon 11/24

11:40 am-4:27 pm

1 stop20h 47m

$1,087

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 2/16

2:45 pm-8:45 am

2 stops26h 00m

Brisbane

Fri 2/20

10:45 am-3:29 pm

2 stops44h 44m

$1,103

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 11/22

8:20 am-7:30 am

2 stops55h 10m

Brisbane

Fri 12/26

11:40 am-10:30 pm

1 stop26h 50m

$1,107

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 11/22

4:05 pm-1:25 pm

3 stops53h 20m

Brisbane

Fri 12/26

10:45 am-3:29 pm

2 stops44h 44m

$1,115

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 2/16

6:00 pm-9:35 am

2 stops46h 35m

Sydney Kingsford Smith

Fri 2/20

11:20 am-4:58 pm

2 stops22h 38m

$1,194

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 11/28

7:00 am-9:50 am

2 stops33h 50m

Sydney Kingsford Smith

Sun 12/14

2:05 pm-7:27 pm

1 stop22h 22m

$1,241

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/5

1:20 pm-6:55 am

1 stop24h 35m

Sydney Kingsford Smith

Sun 11/23

2:05 pm-4:32 pm

1 stop19h 27m

$1,275

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/5

2:29 pm-9:00 am

2 stops25h 31m

Sydney Kingsford Smith

Sun 11/23

11:20 am-7:30 pm

2 stops25h 10m

$1,278

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 2/10

2:50 pm-9:00 am

2 stops25h 10m

Sydney Kingsford Smith

Tue 2/24

2:05 pm-10:24 pm

1 stop25h 19m

$1,279

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/25

Showing 1-10 of 60 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 $687). Flying from St. Louis to Australia in May 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 October 26, 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 October 26, 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
8.0
Very good
207 reviews

Overall

8.0

Crew

8.5

Food

7.5

Entertainment

7.4

Comfort

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!!
Fiji Airways
8.0
Very good
207 reviews
Fiji Airways
8.0
Very good
207 reviews

Overall

8.0

Crew

8.5

Food

7.5

Entertainment

7.4

Comfort

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!!
Qantas Airways
7.5
Good
923 reviews
Fiji Airways
8.0
Very good
207 reviews

Overall

8.0

Crew

8.5

Food

7.5

Entertainment

7.4

Comfort

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!!
United Airlines
7.4
Good
8,998 reviews
Fiji Airways
8.0
Very good
207 reviews

Overall

8.0

Crew

8.5

Food

7.5

Entertainment

7.4

Comfort

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!!
American Airlines
7.2
Good
11,035 reviews
Fiji Airways
8.0
Very good
207 reviews

Overall

8.0

Crew

8.5

Food

7.5

Entertainment

7.4

Comfort

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!!
Air Canada
7.1
Good
10,364 reviews
Fiji Airways
8.0
Very good
207 reviews

Overall

8.0

Crew

8.5

Food

7.5

Entertainment

7.4

Comfort

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 01m. 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 Air Canada, which is currently one of the cheapest options available, starting at $671. United Airlines flights start at $690 while deals on Qantas Airways start at $700 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, February is the cheapest month in which you can book a flight from St. Louis to Australia (average of $687). Flying from St. Louis to Australia in May 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 October 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapest$897Average$1,281FlexibilityNo cancel feeOn-time67%
Qantas AirwaysCheapest$975Average$1,370FlexibilityNo cancel feeOn-time74%
United AirlinesCheapest$1,029Average$1,556FlexibilityNo cancel feeOn-time69%
Fiji AirwaysCheapest$1,132Average$1,296FlexibilityNo cancel feeOn-time74%
Air New ZealandCheapest$1,259Average$1,437FlexibilityNo cancel feeOn-time78%
American AirlinesCheapest$1,260Average$1,501FlexibilityNo cancel feeOn-time71%

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