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$1,151+ Cheap flights from St. Louis (STL) to Australia

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/5. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Mar 31 — Apr 71
Mon 3/31
Mon 4/7
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 March 26, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,167
(Jetabroad)

Popular in

December

Cheapest in

November

Average price

$1,454
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
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($123 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($29 potential savings vs. average RT price).
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Average for round-trip flights in March 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 March 26, 2025.

This Fiji Airways deal was found by Cheapflights users on 3/25. 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 Fiji Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/55:27 pmSTL - SYD
2 stops27h 18mMultiple Airlines
Tue 8/121:15 pmSYD - STL
2 stops24h 15mMultiple Airlines
Deal found 3/25$1,151
This oojo deal was found by Cheapflights users on 3/25. 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.
Tue 5/67:19 pmSTL - SYD
2 stops35h 51mFiji Airways
Sat 5/171:45 pmSYD - STL
2 stops24h 01mFiji Airways
Deal found 3/25$1,203
This Air Canada deal was found by Cheapflights users on 3/24. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/71:30 pmSTL - SYD
2 stops26h 50mAir Canada
Sun 6/159:20 amSYD - STL
2 stops25h 38mAir Canada
Deal found 3/24$1,242
This Air Canada deal was found by Cheapflights users on 3/25. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/107:30 amSTL - AVV
3 stops41h 35mMultiple Airlines
Wed 6/188:55 pmAVV - STL
3 stops54h 41mMultiple Airlines
Deal found 3/25$1,391
This BYOjet deal was found by Cheapflights users on 3/24. 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 BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/88:30 amSTL - MEL
2 stops45h 05mAir New Zealand
Thu 5/158:35 amMEL - STL
2 stops27h 01mAir New Zealand
Deal found 3/24$1,406
This Justfly.com deal was found by Cheapflights users on 3/24. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/11:30 pmSTL - BNE
2 stops26h 35mAir Canada
Mon 6/3010:00 amBNE - STL
2 stops48h 40mAir Canada
Deal found 3/24$1,426
This American Airlines deal was found by Cheapflights users on 3/25. 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.
Sun 5/186:52 amSTL - SYD
1 stop33h 13mAmerican Airlines
Sun 6/19:10 amSYD - STL
1 stop28h 54mAmerican Airlines
Deal found 3/25$1,442
This United Airlines deal was found by Cheapflights users on 3/25. 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.
Tue 6/106:30 amSTL - MEL
2 stops34h 45mUnited Airlines
Wed 6/1810:55 amMEL - STL
1 stop22h 05mUnited Airlines
Deal found 3/25$1,444
This Gurufare deal was found by Cheapflights users on 3/25. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/197:19 pmSTL - SYD
1 stop20h 36mQantas Airways
Wed 5/285:45 pmSYD - STL
1 stop20h 19mQantas Airways
Deal found 3/25$1,450
This United deal was found by Cheapflights users on 3/25. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/2211:20 amSTL - BNE
2 stops28h 10mUnited Airlines
Fri 12/2611:40 amBNE - STL
2 stops43h 41mUnited Airlines
Deal found 3/25$1,456
This United Airlines deal was found by Cheapflights users on 3/25. 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.
Sun 5/186:11 pmSTL - SYD
1 stop21h 44mUnited Airlines
Mon 5/2610:20 amSYD - STL
1 stop22h 40mUnited Airlines
Deal found 3/25$1,456
This Fareboom deal was found by Cheapflights users on 3/24. 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 Fareboom is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 7/135:51 pmSTL - SYD
2 stops25h 44mAir New Zealand
Sun 7/2011:50 amSYD - STL
2 stops25h 25mAir New Zealand
Deal found 3/24$1,503

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 March 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. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 5/6

7:19 pm-10:10 pm

2 stops35h 51m

Sydney Kingsford Smith

Sat 5/17

1:45 pm-10:46 pm

2 stops24h 01m

$1,203

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 6/7

1:30 pm-7:20 am

2 stops26h 50m

Sydney Kingsford Smith

Sun 6/15

9:20 am-7:58 pm

2 stops25h 38m

$1,242

St. LouisMelbourne

STL - AVV

STLAVV

Lambert-St Louis

Tue 6/10

7:30 am-4:05 pm

3 stops41h 35m

Melbourne Avalon

Wed 6/18

8:55 pm-12:36 pm

3 stops54h 41m

$1,391

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Thu 5/8

8:30 am-8:35 pm

2 stops45h 05m

Melbourne

Thu 5/15

8:35 am-8:36 pm

2 stops27h 01m

$1,406

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 6/1

1:30 pm-7:05 am

2 stops26h 35m

Brisbane

Mon 6/30

10:00 am-7:40 pm

2 stops48h 40m

$1,426

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 5/18

6:52 am-7:05 am

1 stop33h 13m

Sydney Kingsford Smith

Sun 6/1

9:10 am-11:04 pm

1 stop28h 54m

$1,442

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 6/10

9:50 am-8:15 am

2 stops31h 25m

Melbourne

Tue 6/24

10:55 am-6:00 pm

1 stop22h 05m

$1,444

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/19

7:19 pm-6:55 am

1 stop20h 36m

Sydney Kingsford Smith

Wed 5/28

5:45 pm-11:04 pm

1 stop20h 19m

$1,450

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 5/18

6:11 pm-6:55 am

1 stop21h 44m

Sydney Kingsford Smith

Mon 5/26

10:20 am-6:00 pm

1 stop22h 40m

$1,456

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 6/10

7:30 am-11:05 am

3 stops36h 35m

Melbourne

Wed 6/18

8:30 pm-12:36 pm

3 stops55h 06m

$1,516

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/25

Showing 1-10 of 30 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 $1,044). 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 March 26, 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 March 26, 2025.
Get a feel of what it's like to fly with ANA, Fiji Airways and Emirates 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.
ANA
8.3
Very good
826 reviews

Boarding

8.5

Comfort

8.2

Overall

8.3

Food

7.6

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
ANA
8.3
Very good
826 reviews
ANA
8.3
Very good
826 reviews

Boarding

8.5

Comfort

8.2

Overall

8.3

Food

7.6

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Fiji Airways
8.0
Very good
182 reviews
ANA
8.3
Very good
826 reviews

Boarding

8.5

Comfort

8.2

Overall

8.3

Food

7.6

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Emirates
8.0
Very good
3,190 reviews
ANA
8.3
Very good
826 reviews

Boarding

8.5

Comfort

8.2

Overall

8.3

Food

7.6

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Air New Zealand
7.9
Good
455 reviews
ANA
8.3
Very good
826 reviews

Boarding

8.5

Comfort

8.2

Overall

8.3

Food

7.6

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.
Qantas Airways
7.5
Good
811 reviews
ANA
8.3
Very good
826 reviews

Boarding

8.5

Comfort

8.2

Overall

8.3

Food

7.6

Entertainment

7.9

Crew

8.7

Reviews

1 / 20
4.0
Okay

Anonymous,Mar 2025

SFO - HND

Don't bother with economy, it's so small!!! I'm a small person and I was cramped in the middle seat on a 11 hour flight. Not fun. Go for business or first class for such a long flight if you can or be prepared to have trouble moving when you stand up. Also be prepared to have trouble sleeping too. Crew was awesome though, they were helpful and provided excellent service.

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 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 - Melbourne and Lambert-St Louis - Brisbane.

  • 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 $1,044). 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 March 26, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$687Average$2,042FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$962Average$1,339FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$1,010Average$1,670FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$1,164Average$1,529FlexibilityNo cancel feeOn-time71%
Air New ZealandCheapest$1,173Average$1,830FlexibilityNo cancel feeOn-time78%
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