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$659+ 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 6/3. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Apr 20 — Apr 271
Sun 4/20
Sun 4/27
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 April 15, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,196
(oojo)

One-way from

$659
(Kiwi.com)

Popular in

December

Cheapest in

November

Average price

$1,504
Provider with most accurate pricing for Lambert-St Louis-Sydney Kingsford Smith flight deals.
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Provider most trusted by Cheapflights users for Lambert-St Louis-Sydney Kingsford Smith flights.
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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 ($126 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($28 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 15, 2025.

This oojo deal was found by Cheapflights users on 4/15. 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.
Sat 5/107:19 pmSTL - MEL
2 stops33h 01mMultiple Airlines
Sat 5/247:30 amMEL - STL
2 stops30h 15mMultiple Airlines
Deal found 4/15$1,196
This StudentUniverse deal was found by Cheapflights users on 4/15. 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 StudentUniverse is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/117:59 pmSTL - SYD
2 stops25h 16mFiji Airways
Tue 9/301:15 pmSYD - STL
2 stops24h 12mFiji Airways
Deal found 4/15$1,248
This Justfly.com deal was found by Cheapflights users on 4/15. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/101:30 pmSTL - SYD
2 stops50h 50mAir Canada
Tue 9/309:20 amSYD - STL
2 stops49h 37mAir Canada
Deal found 4/15$1,252
This KAYAK deal was found by Cheapflights users on 4/15. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/105:45 pmSTL - SYD
2 stops24h 00mAir New Zealand
Sun 9/2810:50 amSYD - STL
2 stops44h 52mAir New Zealand
Deal found 4/15$1,263
This Gurufare deal was found by Cheapflights users on 4/15. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/67:19 pmSTL - SYD
2 stops35h 51mMultiple Airlines
Fri 5/164:20 pmSYD - STL
2 stops22h 44mMultiple Airlines
Deal found 4/15$1,346
This Air Canada deal was found by Cheapflights users on 4/15. 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.
Thu 10/234:05 pmSTL - BNE
2 stops48h 00mAir Canada
Fri 11/710:45 amBNE - STL
2 stops44h 41mAir Canada
Deal found 4/15$1,387
This United deal was found by Cheapflights users on 4/14. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/227:00 pmSTL - BNE
1 stop20h 30mUnited Airlines
Fri 12/2611:40 amBNE - STL
1 stop28h 47mUnited Airlines
Deal found 4/14$1,431
This American Airlines deal was found by Cheapflights users on 4/14. 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.
Tue 6/33:58 pmSTL - SYD
2 stops24h 07mAmerican Airlines
Wed 6/189:10 amSYD - STL
1 stop28h 49mAmerican Airlines
Deal found 4/14$1,444
This Gurufare deal was found by Cheapflights users on 4/14. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/37:19 pmSTL - SYD
1 stop20h 36mQantas Airways
Wed 6/189:10 amSYD - STL
1 stop28h 49mQantas Airways
Deal found 4/14$1,448
This United Airlines deal was found by Cheapflights users on 4/15. 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.
Mon 9/85:45 pmSTL - SYD
1 stop22h 10mUnited Airlines
Wed 10/110:20 amSYD - STL
1 stop21h 22mUnited Airlines
Deal found 4/15$1,456
This United Airlines deal was found by Cheapflights users on 4/15. 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.
Tue 6/101:10 pmSTL - MEL
2 stops28h 05mUnited Airlines
Tue 6/2410:55 amMEL - STL
2 stops44h 58mUnited Airlines
Deal found 4/15$1,463
This Expedia deal was found by Cheapflights users on 4/14. 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.
Thu 10/239:15 amSTL - BNE
3 stops35h 15mMultiple Airlines
Fri 11/710:45 amBNE - STL
2 stops44h 41mMultiple Airlines
Deal found 4/14$1,485

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 April 15, 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. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sat 5/10

7:19 pm-7:20 pm

2 stops33h 01m

Melbourne

Sat 5/24

7:30 am-10:45 pm

2 stops30h 15m

$1,196

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 9/11

7:59 pm-12:15 pm

2 stops25h 16m

Sydney Kingsford Smith

Tue 9/30

1:15 pm-10:27 pm

2 stops24h 12m

$1,248

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 9/10

1:30 pm-7:20 am

2 stops50h 50m

Sydney Kingsford Smith

Tue 9/30

9:20 am-7:57 pm

2 stops49h 37m

$1,252

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 9/10

5:45 pm-8:45 am

2 stops24h 00m

Sydney Kingsford Smith

Sun 9/28

10:50 am-4:42 pm

2 stops44h 52m

$1,263

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 5/6

7:19 pm-10:10 pm

2 stops35h 51m

Sydney Kingsford Smith

Fri 5/16

4:20 pm-12:04 am

2 stops22h 44m

$1,346

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 6/3

3:58 pm-7:05 am

2 stops24h 07m

Sydney Kingsford Smith

Wed 6/18

9:10 am-10:59 pm

1 stop28h 49m

$1,444

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 6/3

7:19 pm-6:55 am

1 stop20h 36m

Sydney Kingsford Smith

Wed 6/18

9:10 am-10:59 pm

1 stop28h 49m

$1,448

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/8

5:45 pm-6:55 am

1 stop22h 10m

Sydney Kingsford Smith

Wed 10/1

10:20 am-4:42 pm

1 stop21h 22m

$1,456

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 6/10

1:10 pm-8:15 am

2 stops28h 05m

Melbourne

Tue 6/24

10:55 am-4:53 pm

2 stops44h 58m

$1,463

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 5/11

1:30 pm-7:05 am

2 stops26h 35m

Brisbane

Sun 5/18

10:00 am-7:58 pm

2 stops48h 58m

$1,495

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/14

Showing 1-10 of 41 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 $1,046). Flying from St. Louis to Australia in December is currently the most expensive (average of $1,643). 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 April 15, 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.

Rainfall in Australia by month

Plan your trip to Australia by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Australia ranges from 2.0 - 5.1 inches per month. March is typically the wettest month, when rainfall can reach 5.1 in. September is typically the driest time to visit Australia when rainfall is around 2.0 in.

Temperature in Australia by month

Plan your trip to Australia by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Australia, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 71.6 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 51.8 F).

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 April 15, 2025.
Get a feel of what it's like to fly with Japan Airlines, ANA and Asiana Airlines from St. Louis to Australia by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Japan Airlines
8.3
Very good
1,440 reviews

Entertainment

7.8

Overall

8.3

Comfort

8.2

Food

7.7

Boarding

8.4

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!
Japan Airlines
8.3
Very good
1,440 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Entertainment

7.8

Overall

8.3

Comfort

8.2

Food

7.7

Boarding

8.4

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!
ANA
8.3
Very good
841 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Entertainment

7.8

Overall

8.3

Comfort

8.2

Food

7.7

Boarding

8.4

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!
Asiana Airlines
8.2
Very good
438 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Entertainment

7.8

Overall

8.3

Comfort

8.2

Food

7.7

Boarding

8.4

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!
Fiji Airways
8.0
Very good
183 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Entertainment

7.8

Overall

8.3

Comfort

8.2

Food

7.7

Boarding

8.4

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!
Emirates
8.0
Very good
3,198 reviews
Japan Airlines
8.3
Very good
1,440 reviews

Entertainment

7.8

Overall

8.3

Comfort

8.2

Food

7.7

Boarding

8.4

Crew

8.7

Reviews

1 / 20
8.0
Excellent

Diego,Nov 2024

HKG - NRT

overall very good; just found a bit poor the food options in Narita airport but the in the flight it was good but limited (no real choice to avoid seafood or clearly stay away from pork..); most of the food was tasty tho and the choice was nice, specially their snacks and dessert and drinks. The in-flight systems was so-so (too complicated interface; they should rehaul with a proper UIX), and I specially appreciated their segments of videos capsules about the behind the scenes including an overview of technicalities of their aircraft and days in the life of their pilots. It was refreshing and give a good ideas of the efforts and challenges every employees has to deal with. Loved it!

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.

  • What are the cheapest airlines to fly from St. Louis to Australia one-way?

    To fly one-way, consider booking your trip with Fiji Airways, which is currently one of the cheapest options available, starting at $698. American Airlines flights start at $846 while deals on Air Canada start at $849 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 - Sydney Kingsford Smith, Lambert-St Louis - Perth and Lambert-St Louis - Melbourne.

  • 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 $1,046). Flying from St. Louis to Australia in December is currently the most expensive (average of $1,643). 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 5 airlines flying from St. Louis to Australia

Discover the top 5 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 April 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$687Average$1,935FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$962Average$1,339FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$1,010Average$1,665FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$1,164Average$1,469FlexibilityNo cancel feeOn-time71%
Air New ZealandCheapest$1,173Average$1,844FlexibilityNo cancel feeOn-time78%

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