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$499+ Cheap flights from Australia to St. Louis (STL)

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 12/15. Fares are subject to change and may not be available on all flights or dates of travel.
SYD — STL
Aug 24 — Aug 311
Sun 8/24
Sun 8/31
1 adult, Economy
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Cheap flight deals from Australia to St. Louis

Keep the following information in mind while searching for Australia to St. Louis flight deals. Data was last updated August 19, 2025.

Round-trip from

$827
(United Airlines)

One-way from

$499
(Delta)

Popular in

December

Cheapest in

November

Average price

$1,388
From Australia to Lambert-St Louis
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One-way flight from Australia to Lambert-St Louis
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Highest demand for flights based on searches. 0% potential increase in price ($6 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($21 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Australia to St. Louis

Cheapest flights from Australia to St. Louis
Explore the most affordable flight options available from Australia to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 19, 2025.

This American Airlines deal was found by Cheapflights users on 8/17. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/189:10 amSYD - STL
2 stops24h 19mAmerican Airlines
Sat 11/88:40 amSTL - SYD
2 stops31h 20mAmerican Airlines
Deal found 8/17$817
This United Airlines deal was found by Cheapflights users on 8/18. 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 11/112:00 pmMEL - STL
2 stops25h 49mUnited Airlines
Mon 11/108:20 amSTL - MEL
2 stops32h 10mUnited Airlines
Deal found 8/18$827
This United Airlines deal was found by Cheapflights users on 8/17. 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.
Mon 8/1810:20 amSYD - STL
1 stop21h 25mUnited Airlines
Sat 11/88:20 amSTL - SYD
1 stop29h 40mUnited Airlines
Deal found 8/17$834
This United Airlines deal was found by Cheapflights users on 8/19. 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 12/131:00 pmMEL - STL
2 stops38h 46mUnited Airlines
Thu 1/13:10 pmSTL - MEL
2 stops25h 50mUnited Airlines
Deal found 8/19$841
This Delta deal was found by Cheapflights users on 8/19. 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.
Thu 9/119:25 amSYD - STL
2 stops26h 50mDelta
Sat 9/1310:40 amSTL - SYD
2 stops28h 55mDelta
Deal found 8/19$865
This American Airlines deal was found by Cheapflights users on 8/19. 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 9/119:10 amSYD - STL
1 stop28h 49mAmerican Airlines
Sat 9/132:01 pmSTL - SYD
2 stops26h 04mAmerican Airlines
Deal found 8/19$935
This United Airlines deal was found by Cheapflights users on 8/17. 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.
Mon 9/810:55 amMEL - STL
1 stop20h 58mUnited Airlines
Tue 9/305:35 pmSTL - MEL
2 stops39h 15mUnited Airlines
Deal found 8/17$1,056
This Booking.com deal was found by Cheapflights users on 8/18. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/18:20 pmMEL - STL
3 stops60h 09mMultiple Airlines
Mon 11/104:05 pmSTL - MEL
3 stops56h 15mMultiple Airlines
Deal found 8/18$1,102
This United Airlines deal was found by Cheapflights users on 8/16. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/110:55 amMEL - STL
1 stop20h 59mUnited Airlines
Wed 10/86:15 amSTL - MEL
2 stops34h 15mUnited Airlines
Deal found 8/16$1,183
This Gurufare deal was found by Cheapflights users on 8/19. 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.
Sat 12/136:05 amMEL - STL
2 stops22h 35mMultiple Airlines
Thu 1/16:30 amSTL - MEL
1 stop34h 00mMultiple Airlines
Deal found 8/19$1,246
This Booking.com deal was found by Cheapflights users on 8/18. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/29:20 amSYD - STL
2 stops49h 18mAir Canada
Fri 9/54:05 pmSTL - SYD
2 stops48h 15mAir Canada
Deal found 8/18$1,266
This Trip.com deal was found by Cheapflights users on 8/18. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/29:20 amSYD - STL
2 stops25h 18mMultiple Airlines
Thu 10/96:39 amSTL - SYD
1 stop32h 51mMultiple Airlines
Deal found 8/18$1,281

Cheapflights Fare Finder

 
Customize your flight search to find flights from Australia to St. Louis 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 August 19, 2025.
Use the filters below to find and compare flights from Australia to St. Louis that are best for you.

Fly from

Australia

Fly to

St. Louis

Route

Depart

Return

Price

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Sat 11/1

12:00 pm-4:27 pm

1 stop20h 27m

Lambert-St Louis

Mon 11/10

1:35 pm-9:30 am

2 stops26h 55m

$827

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Sat 12/13

1:00 pm-10:46 am

2 stops38h 46m

Lambert-St Louis

Thu 1/1

3:10 pm-10:00 am

2 stops25h 50m

$841

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Mon 9/8

10:55 am-4:53 pm

1 stop20h 58m

Lambert-St Louis

Tue 9/30

5:35 pm-11:50 pm

2 stops39h 15m

$1,056

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Sat 11/1

8:20 pm-4:29 pm

3 stops60h 09m

Lambert-St Louis

Mon 11/10

4:05 pm-5:20 pm

3 stops56h 15m

$1,102

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Wed 10/1

10:55 am-8:46 pm

2 stops24h 51m

Lambert-St Louis

Wed 10/8

9:00 am-8:30 am

2 stops31h 30m

$1,183

MelbourneSt. Louis

MEL - STL

MELSTL

Melbourne

Sat 12/13

6:05 am-11:40 am

2 stops22h 35m

Lambert-St Louis

Thu 1/1

6:30 am-9:30 am

1 stop34h 00m

$1,246

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 9/2

9:20 am-7:38 pm

2 stops49h 18m

Lambert-St Louis

Fri 9/5

4:05 pm-7:20 am

2 stops48h 15m

$1,266

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Thu 10/2

9:20 am-7:38 pm

2 stops25h 18m

Lambert-St Louis

Thu 10/9

6:39 am-7:30 am

1 stop32h 51m

$1,281

LauncestonSt. Louis

LST - STL

LSTSTL

Launceston

Thu 11/20

6:20 am-4:27 pm

2 stops27h 07m

Lambert-St Louis

Mon 11/24

5:29 pm-3:25 pm

2 stops28h 56m

$1,347

SydneySt. Louis

SYD - STL

SYDSTL

Sydney Kingsford Smith

Tue 9/2

12:10 pm-4:08 pm

1 stop18h 58m

Lambert-St Louis

Fri 9/5

6:20 am-7:05 am

1 stop33h 45m

$1,397

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/19

Showing 1-10 of 32 results
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Best time to book a flight from Australia to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis from Australia 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 Australia to St. Louis

What is the cheapest month to book a flight from Australia to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Australia to St. Louis (average of $311). Flying from Australia to St. Louis in March is currently the most expensive (average of $356). 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 AU to STL?

Find hourly flight availability from Australia to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 19, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Australia to St. Louis as you normally would.

Reviews of airlines servicing St. Louis

Get insights into the airlines that provide service to St. Louis. 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 St. Louis. Reviews last updated August 19, 2025.
Peruse reviews from past customers who have flown with Qantas Airways and United Airlines from Australia to St. Louis to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Qantas Airways
7.5
Good
896 reviews

Entertainment

7.2

Food

6.9

Boarding

7.7

Comfort

7.4

Overall

7.5

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jul 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.
Qantas Airways
7.5
Good
896 reviews
Qantas Airways
7.5
Good
896 reviews

Entertainment

7.2

Food

6.9

Boarding

7.7

Comfort

7.4

Overall

7.5

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jul 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.
United Airlines
7.4
Good
8,922 reviews
Qantas Airways
7.5
Good
896 reviews

Entertainment

7.2

Food

6.9

Boarding

7.7

Comfort

7.4

Overall

7.5

Crew

8.2

Reviews

1 / 20
2.0
Mediocre

Anonymous,Jul 2025

MEL - SYD

Flight cancelled 2hours before take off after checking in. Booked by airline on flight 6 hours later. No compensation or vouchers till we asked just before the flight took off.

Related info for your journey

Find useful and relevant information for your journey from Australia to St. Louis. 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 into for flights to St. Louis from Australia?

    For a flight from Australia to St. Louis, you will be flying into Lambert-St Louis. Lambert-St Louis (STL) is just 12.7 mi from the center of the city.

  • How long is the flight from Australia to St. Louis?

    A quick flight from Australia to St. Louis can take about 18h 58m. United Airlines provides one of the quickest options available for as low as $1,397. The distance from Australia to St. Louis is about 9054 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • What are the most popular routes from Australia to St. Louis?

    When deciding which route to take from Australia to St. Louis consider Melbourne - Lambert-St Louis, Devonport - Lambert-St Louis or Launceston - Lambert-St Louis as they are the most popular.

  • Can I find deals for flights from Australia to St. Louis that include hotel bookings?

    Yes. In addition to deals on Australia to St. Louis flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Australia to St. Louis?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Australia to St. Louis.

  • Can I find deals for business class flights from Australia to St. Louis?

    Yes. Cheapflights offers flight deals from Australia to St. Louis 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 Australia to St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Australia to St. Louis (average of $311). Flying from Australia to St. Louis in March is currently the most expensive (average of $356). 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

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Chesterfield
Farmington
Festus

Browse thousands of different options on Cheapflights for your next trip

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Top 2 airlines flying from Australia to St. Louis

Discover the top 2 airlines that operate flights from Australia to St. Louis. 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 August 19, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$822Average$1,307FlexibilityNo cancel feeOn-time69%
Qantas AirwaysCheapest$1,110Average$1,789FlexibilityNo cancel feeOn-time74%

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