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$514+ Cheap flights from Missouri 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 11/19. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SYD
Nov 21 — Nov 281
Fri 11/21
Fri 11/28
1 adult, Economy
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Find flight deals from Missouri to Australia

Cheapest flights from Missouri to Australia
Explore the most affordable flight options available from Missouri to Australia. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 22, 2025.

This Qantas Airways deal was found by Cheapflights users on 10/21. 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 Qantas Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/121:20 pmSTL - SYD
1 stop24h 35mQantas Airways
Sun 11/237:05 amSYD - STL
2 stops22h 32mQantas Airways
Deal found 10/21$1,144
This Air Canada deal was found by Cheapflights users on 10/22. 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 11/225:10 pmMCI - BNE
2 stops23h 35mMultiple Airlines
Fri 12/2610:45 amBNE - MCI
2 stops21h 22mMultiple Airlines
Deal found 10/22$1,179
This American Airlines deal was found by Cheapflights users on 10/19. 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.
Tue 12/27:00 amSTL - BNE
1 stop30h 00mAmerican Airlines
Tue 12/912:10 pmBNE - STL
1 stop27h 47mAmerican Airlines
Deal found 10/19$1,191
This Delta deal was found by Cheapflights users on 10/20. 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.
Fri 10/313:55 pmMCI - SYD
1 stop23h 35mDelta
Fri 11/710:40 amSYD - MCI
1 stop21h 06mDelta
Deal found 10/20$1,229
This Air Canada deal was found by Cheapflights users on 10/21. 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 12/54:05 pmSTL - SYD
2 stops45h 50mMultiple Airlines
Fri 12/1211:20 amSYD - STL
2 stops22h 08mMultiple Airlines
Deal found 10/21$1,232
This American Airlines deal was found by Cheapflights users on 10/21. 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 11/249:40 amBNE - STL
1 stop22h 47mAmerican Airlines
Deal found 10/21$1,241
This oojo deal was found by Cheapflights users on 10/21. 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.
Fri 11/287:00 amSTL - SYD
2 stops33h 20mQantas Airways
Sun 12/142:05 pmSYD - STL
1 stop22h 22mQantas Airways
Deal found 10/21$1,241
This oojo deal was found by Cheapflights users on 10/20. 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 11/195:49 pmMCI - SYD
2 stops35h 36mQantas Airways
Wed 11/262:05 pmSYD - MCI
1 stop19h 38mQantas Airways
Deal found 10/20$1,245
This FlightHub deal was found by Cheapflights users on 10/21. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/221:47 pmMCI - BNE
2 stops50h 58mAir Canada
Fri 12/2610:45 amBNE - MCI
2 stops28h 28mAir Canada
Deal found 10/21$1,263
This Air Canada deal was found by Cheapflights users on 10/21. 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 11/221:35 pmSTL - BNE
2 stops51h 10mAir Canada
Fri 12/2610:45 amBNE - STL
2 stops27h 37mAir Canada
Deal found 10/21$1,264
This American Airlines deal was found by Cheapflights users on 10/20. 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 12/282:00 pmMCI - MEL
2 stops26h 30mAmerican Airlines
Tue 1/1312:00 pmMEL - MCI
2 stops26h 27mAmerican Airlines
Deal found 10/20$1,265
This American Airlines deal was found by Cheapflights users on 10/21. 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 11/57:00 amSTL - SYD
1 stop31h 25mAmerican Airlines
Sun 11/232:05 pmSYD - STL
1 stop25h 29mAmerican Airlines
Deal found 10/21$1,275

Cheap flight deals from Missouri to Australia

Keep the following information in mind while searching for Missouri to Australia flight deals. Data was last updated October 22, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$1,136
(Air Canada)

One-way from

$514
(Trip.com)

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.
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From Missouri to Australia
Search Deals
One-way flight from Missouri to Australia
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($89 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($28 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 Missouri 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 22, 2025.
Use the filters below to find and compare flights from Missouri to Australia that are best for you.

Fly from

Missouri

Fly to

Australia

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 11/12

1:20 pm-6:55 am

1 stop24h 35m

Sydney Kingsford Smith

Sun 11/23

7:05 am-12:37 pm

2 stops22h 32m

$1,144

Kansas CityBrisbane

MCI - BNE

MCIBNE

Kansas City

Sat 11/22

5:10 pm-8:45 am

2 stops23h 35m

Brisbane

Fri 12/26

10:45 am-4:07 pm

2 stops21h 22m

$1,179

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Tue 2/24

5:49 pm-6:30 am

1 stop20h 41m

Brisbane

Mon 3/9

7:40 pm-11:09 pm

1 stop18h 29m

$1,191

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Tue 12/2

7:00 am-5:00 am

1 stop30h 00m

Brisbane

Tue 12/9

12:10 pm-11:57 pm

1 stop27h 47m

$1,191

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 12/5

4:05 pm-6:55 am

2 stops45h 50m

Sydney Kingsford Smith

Fri 12/12

11:20 am-4:28 pm

2 stops22h 08m

$1,232

Kansas CitySydney

MCI - SYD

MCISYD

Kansas City

Fri 10/31

10:48 am-7:30 am

2 stops28h 42m

Sydney Kingsford Smith

Fri 11/7

10:40 am-5:52 pm

2 stops24h 12m

$1,233

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 11/28

7:00 am-9:20 am

2 stops33h 20m

Sydney Kingsford Smith

Sun 12/14

2:05 pm-7:27 pm

1 stop22h 22m

$1,241

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Fri 11/14

2:29 pm-5:00 am

2 stops22h 31m

Brisbane

Mon 11/24

9:40 am-3:29 pm

1 stop21h 49m

$1,246

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

$1,253

Kansas CityBrisbane

MCI - BNE

MCIBNE

Kansas City

Sun 2/1

5:45 am-8:45 am

2 stops35h 00m

Brisbane

Sat 2/7

10:45 am-4:08 pm

2 stops21h 23m

$1,256

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/20

Showing 1-10 of 60 results
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Best time to book a flight from Missouri to Australia

Have a flexible travel schedule? Discover the best time to fly to Australia from Missouri 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 Missouri to Australia

What is the cheapest month to book a flight from Missouri to Australia?

Currently, May is the cheapest month in which you can book a flight from Missouri to Australia (average of $568). Flying from Missouri to Australia in July is currently the most expensive (average of $1,242). 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 MO to AU?

Find hourly flight availability from Missouri 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 22, 2025.

When flying from Missouri to Australia, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 13% versus a flight in the evening.

What is the cheapest day to fly from Missouri to Australia?

Use this chart to determine the cheapest time to fly round-trip from Missouri to Australia. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Missouri to Australia flight should consider departing on Wednesday at noon 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.

Related info for your journey

Find useful and relevant information for your journey from Missouri to Australia. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Missouri to Australia?

    Airlines like Qantas Airways, American Airlines, and Delta fly from Missouri to Australia in about 20h 41m. The time it takes to get you to your destination can typically vary by up to 8h 01m. Missouri and Australia are separated by a distance of 8745 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Missouri to Australia one-way?

    The cheapest airlines for a one-way flight from Missouri to Australia are United Airlines ($586), Qantas Airways ($605), and Air Canada ($671).

  • Can I find deals for flights from Missouri to Australia that include hotel bookings?

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

  • How can I find direct flights from Missouri to Australia?

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

  • Can I find deals for business class flights from Missouri to Australia?

    Yes. Cheapflights offers flight deals from Missouri 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 Missouri to Australia?

    Currently, May is the cheapest month in which you can book a flight from Missouri to Australia (average of $568). Flying from Missouri to Australia in July is currently the most expensive (average of $1,242). 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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Top 7 airlines flying from Missouri to Australia

Discover the top 7 airlines that operate flights from Missouri 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 22, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$822Average$1,399FlexibilityNo cancel feeOn-time69%
Air CanadaCheapest$897Average$1,202FlexibilityNo cancel feeOn-time67%
Qantas AirwaysCheapest$975Average$1,470FlexibilityNo cancel feeOn-time74%
American AirlinesCheapest$1,044Average$1,491FlexibilityNo cancel feeOn-time71%
Fiji AirwaysCheapest$1,132Average$1,296FlexibilityNo cancel feeOn-time74%
DeltaCheapest$1,211Average$1,442FlexibilityNo cancel feeOn-timeN/A
Air New ZealandCheapest$1,259Average$1,437FlexibilityNo cancel feeOn-time78%

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