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Cheap flights from St. Louis to Australia from $554

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Australia departing on 3/5. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to Australia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
2:45 pm - 8:45 amSTL-BNE
26h 00m2 stops
Multiple Airlines Logo
10:45 am - 3:29 pmBNE-STL
44h 44m2 stops
$931Multiple Airlines
Find Deal
Sun, Feb 1 - Sun, Feb 15
Multiple Airlines Logo
2:45 pm - 8:45 amSTL-BNE
26h 00m2 stops
Multiple Airlines Logo
6:10 am - 3:29 pmBNE-STL
49h 19m3 stops
$949Multiple Airlines
Find Deal
Sun, Feb 1 - Sun, Feb 15
Qantas Airways Logo
5:04 pm - 5:10 pmSTL-BNE
32h 06m2 stops
Qantas Airways Logo
7:40 pm - 11:48 pmBNE-STL
20h 08m1 stop
$967Qantas Airways
Find Deal
Tue, Jan 27 - Fri, Feb 13
Qantas Airways Logo
7:04 am - 8:50 pmSTL-SYD
44h 46m2 stops
Qantas Airways Logo
5:45 pm - 11:48 pmSYD-STL
23h 03m1 stop
$988Qantas Airways
Find Deal
Sat, Jan 31 - Sat, Feb 28
Air Canada Logo
4:05 pm - 9:35 amSTL-SYD
48h 30m2 stops
Air Canada Logo
11:20 am - 8:26 pmSYD-STL
26h 06m2 stops
$1,010Air Canada
Find Deal
Sat, Jan 31 - Sat, Feb 28
American Airlines Logo
7:04 am - 5:00 amSTL-BNE
29h 56m1 stop
American Airlines Logo
7:40 pm - 11:48 pmBNE-STL
20h 08m1 stop
$1,014American Airlines
Find Deal
Sun, Feb 1 - Sun, Feb 15
American Airlines Logo
9:25 am - 5:00 amSTL-BNE
27h 35m2 stops
American Airlines Logo
7:40 pm - 11:48 pmBNE-STL
20h 08m1 stop
$1,018American Airlines
Find Deal
Sun, Feb 1 - Sun, Feb 15
Air Canada Logo
1:30 pm - 7:20 amSTL-SYD
50h 50m3 stops
Air Canada Logo
9:20 am - 3:16 pmSYD-STL
44h 56m2 stops
$1,028Air Canada
Find Deal
Mon, May 4 - Mon, May 18
United Airlines Logo
1:30 pm - 7:00 amSTL-SYD
26h 30m2 stops
United Airlines Logo
10:20 am - 6:22 pmSYD-STL
23h 02m1 stop
$1,165United Airlines
Find Deal
Mon, May 4 - Mon, May 18
United Airlines Logo
6:00 am - 11:55 amSTL-HBA
36h 55m2 stops
United Airlines Logo
6:20 am - 5:11 amHBA-STL
39h 51m2 stops
$4,881United Airlines
Find Deal
Thu, Jan 8 - Thu, Jan 15

Air Canada flights from St. Louis to Australia

Our best Air Canada deals on St. Louis to Australia flight tickets
Air Canada
Jan 31
STL4:05 pmLambert-St Louis
48h 30m
2 stops
SYD9:35 amSydney Kingsford Smith
Feb 28
SYD11:20 amSydney Kingsford Smith
26h 06m
2 stops
STL8:26 pmLambert-St Louis
$1,010
Find similar
Air Canada
Jan 10
STL4:05 pmLambert-St Louis
48h 40m
2 stops
BNE8:45 amBrisbane
Jan 27
BNE10:45 amBrisbane
44h 44m
2 stops
STL3:29 pmLambert-St Louis
$1,034
Find similar
Air Canada
Feb 6
STL6:00 pmLambert-St Louis
46h 45m
2 stops
BNE8:45 amBrisbane
Feb 10
BNE10:45 amBrisbane
26h 13m
2 stops
STL8:58 pmLambert-St Louis
$1,035
Find similar

Qantas Airways flights from St. Louis to Australia

Our best Qantas Airways deals on St. Louis to Australia flight tickets
Qantas Airways
Jan 27
STL5:04 pmLambert-St Louis
32h 06m
2 stops
BNE5:10 pmBrisbane
Feb 13
BNE7:40 pmBrisbane
20h 08m
1 stop
STL11:48 pmLambert-St Louis
$967
Find similar
Qantas Airways
Jan 31
STL7:04 amLambert-St Louis
44h 46m
2 stops
SYD8:50 pmSydney Kingsford Smith
Feb 28
SYD5:45 pmSydney Kingsford Smith
23h 03m
1 stop
STL11:48 pmLambert-St Louis
$988
Find similar
Qantas Airways
Feb 6
STL7:04 amLambert-St Louis
29h 56m
1 stop
BNE5:00 amBrisbane
Feb 10
BNE6:30 pmBrisbane
37h 44m
2 stops
STL4:14 pmLambert-St Louis
$997
Find similar

momondo 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, momondo users made 832,500 searches. Data last updated November 26, 2025.
Use the filters below to find and compare flights from St. Louis to Australia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 2/1

2:45 pm-8:45 am

2 stops26h 00m

Brisbane

Sun 2/15

10:45 am-3:29 pm

2 stops44h 44m

$931

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 2/1

2:45 pm-8:45 am

2 stops26h 00m

Brisbane

Sun 2/15

6:10 am-3:29 pm

3 stops49h 19m

$949

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Tue 1/27

5:04 pm-5:10 pm

2 stops32h 06m

Brisbane

Fri 2/13

7:40 pm-11:48 pm

1 stop20h 08m

$967

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 1/31

7:04 am-8:50 pm

2 stops44h 46m

Sydney Kingsford Smith

Sat 2/28

5:45 pm-11:48 pm

1 stop23h 03m

$988

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 1/31

4:05 pm-9:35 am

2 stops48h 30m

Sydney Kingsford Smith

Sat 2/28

11:20 am-8:26 pm

2 stops26h 06m

$1,010

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 2/1

7:04 am-5:00 am

1 stop29h 56m

Brisbane

Sun 2/15

7:40 pm-11:48 pm

1 stop20h 08m

$1,014

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 2/1

9:25 am-5:00 am

2 stops27h 35m

Brisbane

Sun 2/15

7:40 pm-11:48 pm

1 stop20h 08m

$1,018

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

1:30 pm-7:20 am

3 stops50h 50m

Sydney Kingsford Smith

Mon 5/18

9:20 am-3:16 pm

2 stops44h 56m

$1,028

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 5/4

1:30 pm-7:00 am

2 stops26h 30m

Sydney Kingsford Smith

Mon 5/18

10:20 am-6:22 pm

1 stop23h 02m

$1,165

St. LouisHobart

STL - HBA

STLHBA

Lambert-St Louis

Thu 1/8

6:00 am-11:55 am

2 stops36h 55m

Hobart

Thu 1/15

6:20 am-5:11 am

2 stops39h 51m

$4,881

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Australia from

How to get the cheapest flight ticket from St. Louis to Australia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Australia?

The month of August is, on average, the cheapest month to fly to Australia from St. Louis, with most prices found around $1,275. If you aren’t able to travel during the month of August, then book flights to Australia from St. Louis during October instead. Flights to Australia in October, while not as cheap as those in August, still average around $1,331.

What is the cheapest day to depart on your flight to Australia?

The cheapest day to depart from St. Louis to Australia is on a Wednesday. Travelers who choose to depart for Australia on a Wednesday will often find tickets for as low as $1,392. On the other hand, Saturday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,518.

What is the cheapest time of day to depart on your flight to Australia?

Flying to Australia from St. Louis in the evening is the least expensive time of day to depart. momondo users have found prices as low as $1,440 when looking at flights departing in the evening. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,882 on average. Flights to Australia from St. Louis at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to Australia?

You are more likely to see cheaper flights to Australia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Australia for around $1,458 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Australia from St. Louis for as low as $948 on momondo.

Can stopping save me money on St. Louis to Australia flights?

You could potentially save up to 14% on your flight if you consider stops on a St. Louis to Australia flight.

Cheap St. Louis to Australia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Australia

Fastest flight time

21h 56m

Direct flights

None
The fastest flight from St. Louis to Australia takes 21h 56m
There are no direct flights from St. Louis to Australia. There are no popular flight routes from St. Louis to Australia.
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  • When did momondo last update prices for flights from Lambert-St Louis Airport to Australia?

    Prices for flights from Lambert-St Louis Airport to Australia refresh daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Australia?

  • How old do you have to be to fly from Lambert-St Louis Airport to Australia?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Lambert-St Louis Airport to Australia.

  • What documentation or ID do you need to fly to Australia?

    The travel and health documents required for your trip to Australia can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Australia. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Best airlines flying from St. Louis to Australia

Compare and see reviews for airlines that fly from St. Louis to Australia with momondo
Airline
Rating
Free Cancellation
Price
Air CanadaPriceFrom $897Free CancellationRating
7.1
10,481 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $975Free CancellationRating
7.5
946 reviews
Search Qantas Airways flights
United AirlinesPriceFrom $1,027Free CancellationRating
7.4
9,049 reviews
Search United Airlines flights
Fiji AirwaysPriceFrom $1,132Free CancellationRating
8.1
209 reviews
Search Fiji Airways flights
American AirlinesPriceFrom $1,260Free CancellationRating
7.2
11,039 reviews
Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Australia?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Australia from St. Louis.

Can I find flights from St. Louis to Australia with flexible booking policies on momondo?

All flight searches from St. Louis to Australia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Australia?

Once you have performed a search for St. Louis to Australia flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from St. Louis to Australia right now. Can momondo alert me if prices change?

If you are not ready to book a flight from St. Louis to Australia now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Australia and let you know when they change.

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Find better results for your trip to Australia

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