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$1,215+ 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 11/7. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
May 5 — May 121
Mon 5/5
Mon 5/12
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 30, 2025.

Most accurate provider

AranGrant
3 stars

Most trusted provider

AranGrant
3 stars

Round-trip from

$1,255
(StudentUniverse)

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
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($133 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 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 30, 2025.

This Air Canada deal was found by Cheapflights users on 4/29. 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.
Fri 11/74:15 pmSTL - BNE
2 stops48h 25mAir Canada
Fri 11/1410:45 amBNE - STL
2 stops44h 41mAir Canada
Deal found 4/29$1,215
This StudentUniverse deal was found by Cheapflights users on 4/28. 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.
Mon 6/97:47 pmSTL - SYD
1 stop20h 08mQantas Airways
Fri 6/209:10 amSYD - STL
1 stop28h 49mQantas Airways
Deal found 4/28$1,255
This Gurufare deal was found by Cheapflights users on 4/28. 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.
Wed 8/205:49 pmSTL - SYD
2 stops23h 56mAir New Zealand
Wed 9/39:55 amSYD - STL
2 stops27h 21mAir New Zealand
Deal found 4/28$1,261
This United Airlines deal was found by Cheapflights users on 4/29. 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 11/73:15 pmSTL - BNE
2 stops24h 15mUnited Airlines
Fri 11/1411:40 amBNE - STL
1 stop28h 47mUnited Airlines
Deal found 4/29$1,317
This Air Canada deal was found by Cheapflights users on 4/28. 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 6/57:30 amSTL - SYD
2 stops32h 50mAir Canada
Thu 6/129:20 amSYD - STL
2 stops42h 16mAir Canada
Deal found 4/28$1,346
This Air New Zealand deal was found by Cheapflights users on 4/28. 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 New Zealand is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/204:40 pmSTL - SYD
3 stops26h 55mMultiple Airlines
Wed 9/39:55 amSYD - STL
2 stops27h 21mMultiple Airlines
Deal found 4/28$1,356
This United Airlines deal was found by Cheapflights users on 4/28. 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 6/91:42 pmSTL - SYD
2 stops26h 13mUnited Airlines
Fri 6/2010:20 amSYD - STL
1 stop22h 40mUnited Airlines
Deal found 4/28$1,357
This Delta deal was found by Cheapflights users on 4/28. 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.
Mon 6/99:28 amSTL - SYD
2 stops30h 07mDelta
Mon 6/239:25 amSYD - STL
2 stops27h 09mDelta
Deal found 4/28$1,371
This Fiji Airways deal was found by Cheapflights users on 4/29. 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.
Thu 10/234:12 pmSTL - BNE
2 stops27h 13mMultiple Airlines
Fri 11/711:20 amBNE - STL
2 stops28h 37mMultiple Airlines
Deal found 4/29$1,437
This Gurufare deal was found by Cheapflights users on 4/29. 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.
Wed 10/225:43 pmSTL - BNE
2 stops25h 17mAir New Zealand
Fri 11/711:10 amBNE - STL
2 stops29h 17mAir New Zealand
Deal found 4/29$1,469
This Gurufare deal was found by Cheapflights users on 4/29. 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.
Wed 10/224:12 pmSTL - BNE
2 stops25h 03mQantas Airways
Fri 11/77:25 pmBNE - STL
1 stop20h 32mQantas Airways
Deal found 4/29$1,498
This American Airlines deal was found by Cheapflights users on 4/27. 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 10/17:00 amSTL - SYD
1 stop33h 05mAmerican Airlines
Sat 10/1110:10 amSYD - STL
1 stop28h 43mAmerican Airlines
Deal found 4/27$1,504

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 30, 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

Mon 6/9

7:47 pm-6:55 am

1 stop20h 08m

Sydney Kingsford Smith

Fri 6/20

9:10 am-10:59 pm

1 stop28h 49m

$1,255

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 8/20

5:49 pm-8:45 am

2 stops23h 56m

Sydney Kingsford Smith

Wed 9/3

9:55 am-10:16 pm

2 stops27h 21m

$1,261

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 6/5

7:30 am-7:20 am

2 stops32h 50m

Sydney Kingsford Smith

Thu 6/12

9:20 am-12:36 pm

2 stops42h 16m

$1,346

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 8/20

4:40 pm-8:45 am

3 stops25h 05m

Sydney Kingsford Smith

Wed 9/3

11:50 am-10:16 pm

2 stops25h 26m

$1,356

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 6/9

1:42 pm-6:55 am

2 stops26h 13m

Sydney Kingsford Smith

Fri 6/20

10:20 am-6:00 pm

1 stop22h 40m

$1,357

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 6/9

9:28 am-6:35 am

2 stops30h 07m

Sydney Kingsford Smith

Mon 6/23

9:25 am-9:34 pm

2 stops27h 09m

$1,371

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 10/1

7:00 am-7:05 am

1 stop33h 05m

Sydney Kingsford Smith

Sat 10/11

10:10 am-10:53 pm

1 stop28h 43m

$1,504

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 6/10

1:42 pm-8:15 am

2 stops27h 33m

Melbourne

Tue 6/24

10:55 am-8:48 pm

2 stops24h 53m

$1,595

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 5/14

6:30 am-6:40 pm

2 stops47h 10m

Perth

Wed 5/21

10:45 pm-12:04 am

2 stops38h 19m

$1,743

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 5/14

6:52 am-10:40 pm

2 stops50h 48m

Perth

Tue 5/20

12:10 am-6:33 pm

2 stops31h 23m

$1,815

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/28

Showing 1-10 of 25 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 $1,043). 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 30, 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 30, 2025.
Get a feel of what it's like to fly with Fiji Airways, Delta and Air New Zealand 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.
Fiji Airways
8.1
Very good
190 reviews

Crew

8.5

Boarding

8.2

Comfort

8.1

Entertainment

7.5

Food

7.5

Overall

8.1

Reviews

1 / 15
6.0
Good

Anonymous,Dec 2024

NAN - LAX

Asked for water before dinner was served, didn’t get it. Dinner served but no drinks was asked or served with dinner. When asked if I wanted my seat made for bedtime, asked for water again. This time I got it. Filled the breakfast form but was still asked what I wanted. Comparing this experience with Fiji air flight from LA to Melbourne. Worse was missing my flight connection to Baltimore since Fiji air opted to wait for a passenger that couldn’t pass security. Instead of leaving at 9:40 pm, we left at 11. So spent overnight at a hotel for next day’s flight. Another expense!
Fiji Airways
8.1
Very good
190 reviews
Fiji Airways
8.1
Very good
190 reviews

Crew

8.5

Boarding

8.2

Comfort

8.1

Entertainment

7.5

Food

7.5

Overall

8.1

Reviews

1 / 15
6.0
Good

Anonymous,Dec 2024

NAN - LAX

Asked for water before dinner was served, didn’t get it. Dinner served but no drinks was asked or served with dinner. When asked if I wanted my seat made for bedtime, asked for water again. This time I got it. Filled the breakfast form but was still asked what I wanted. Comparing this experience with Fiji air flight from LA to Melbourne. Worse was missing my flight connection to Baltimore since Fiji air opted to wait for a passenger that couldn’t pass security. Instead of leaving at 9:40 pm, we left at 11. So spent overnight at a hotel for next day’s flight. Another expense!
Delta
8.0
Very good
7,929 reviews
Fiji Airways
8.1
Very good
190 reviews

Crew

8.5

Boarding

8.2

Comfort

8.1

Entertainment

7.5

Food

7.5

Overall

8.1

Reviews

1 / 15
6.0
Good

Anonymous,Dec 2024

NAN - LAX

Asked for water before dinner was served, didn’t get it. Dinner served but no drinks was asked or served with dinner. When asked if I wanted my seat made for bedtime, asked for water again. This time I got it. Filled the breakfast form but was still asked what I wanted. Comparing this experience with Fiji air flight from LA to Melbourne. Worse was missing my flight connection to Baltimore since Fiji air opted to wait for a passenger that couldn’t pass security. Instead of leaving at 9:40 pm, we left at 11. So spent overnight at a hotel for next day’s flight. Another expense!
Air New Zealand
8.0
Very good
471 reviews
Fiji Airways
8.1
Very good
190 reviews

Crew

8.5

Boarding

8.2

Comfort

8.1

Entertainment

7.5

Food

7.5

Overall

8.1

Reviews

1 / 15
6.0
Good

Anonymous,Dec 2024

NAN - LAX

Asked for water before dinner was served, didn’t get it. Dinner served but no drinks was asked or served with dinner. When asked if I wanted my seat made for bedtime, asked for water again. This time I got it. Filled the breakfast form but was still asked what I wanted. Comparing this experience with Fiji air flight from LA to Melbourne. Worse was missing my flight connection to Baltimore since Fiji air opted to wait for a passenger that couldn’t pass security. Instead of leaving at 9:40 pm, we left at 11. So spent overnight at a hotel for next day’s flight. Another expense!
Qantas Airways
7.5
Good
829 reviews
Fiji Airways
8.1
Very good
190 reviews

Crew

8.5

Boarding

8.2

Comfort

8.1

Entertainment

7.5

Food

7.5

Overall

8.1

Reviews

1 / 15
6.0
Good

Anonymous,Dec 2024

NAN - LAX

Asked for water before dinner was served, didn’t get it. Dinner served but no drinks was asked or served with dinner. When asked if I wanted my seat made for bedtime, asked for water again. This time I got it. Filled the breakfast form but was still asked what I wanted. Comparing this experience with Fiji air flight from LA to Melbourne. Worse was missing my flight connection to Baltimore since Fiji air opted to wait for a passenger that couldn’t pass security. Instead of leaving at 9:40 pm, we left at 11. So spent overnight at a hotel for next day’s flight. Another expense!
Cathay Pacific
7.5
Good
852 reviews
Fiji Airways
8.1
Very good
190 reviews

Crew

8.5

Boarding

8.2

Comfort

8.1

Entertainment

7.5

Food

7.5

Overall

8.1

Reviews

1 / 15
6.0
Good

Anonymous,Dec 2024

NAN - LAX

Asked for water before dinner was served, didn’t get it. Dinner served but no drinks was asked or served with dinner. When asked if I wanted my seat made for bedtime, asked for water again. This time I got it. Filled the breakfast form but was still asked what I wanted. Comparing this experience with Fiji air flight from LA to Melbourne. Worse was missing my flight connection to Baltimore since Fiji air opted to wait for a passenger that couldn’t pass security. Instead of leaving at 9:40 pm, we left at 11. So spent overnight at a hotel for next day’s flight. Another expense!

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 - Perth.

  • 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 $1,043). 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

Browse thousands of different options on Cheapflights for your next trip

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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 April 30, 2025.
AirlineCheapestAverageFlexibilityOn-time
Qantas AirwaysCheapest$687Average$1,934FlexibilityNo cancel feeOn-time74%
Air CanadaCheapest$962Average$1,339FlexibilityNo cancel feeOn-time67%
United AirlinesCheapest$1,010Average$1,659FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$1,164Average$1,469FlexibilityNo cancel feeOn-time71%
Air New ZealandCheapest$1,173Average$1,875FlexibilityNo cancel feeOn-time78%
Qatar AirwaysCheapest$1,450Average$1,715FlexibilityNo cancel feeOn-time68%

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