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Cheap flights from St. Louis to Australia from $622

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 4/4. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
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.
Qantas Airways Logo
6:50 pm - 8:50 pm
STL
-
SYD
34h 00m
2 stops
Qantas Airways Logo
11:20 am - 11:58 pm
SYD
-
STL
28h 38m
1 stop
$903Qantas Airways
Mon, Mar 9 - Mon, Mar 16
Qantas Airways Logo
6:50 pm - 8:50 pm
STL
-
SYD
34h 00m
2 stops
Qantas Airways Logo
6:50 pm - 11:58 pm
SYD
-
STL
21h 08m
1 stop
$911Qantas Airways
Mon, Mar 23 - Mon, Mar 30
Air Canada Logo
1:00 pm - 7:05 am
STL
-
BNE
51h 05m
2 stops
Air Canada Logo
10:00 am - 8:05 pm
BNE
-
STL
49h 05m
2 stops
$937Air Canada
Sat, May 23 - Fri, Jun 5
Air Canada Logo
7:30 am - 11:30 am
STL
-
BNE
37h 00m
3 stops
Air Canada Logo
10:00 am - 8:05 pm
BNE
-
STL
25h 05m
2 stops
$1,084Air Canada
Sat, May 23 - Fri, Jun 5
American Airlines Logo
12:45 pm - 5:00 am
STL
-
BNE
25h 15m
2 stops
American Airlines Logo
8:35 pm - 8:31 am
BNE
-
STL
26h 56m
2 stops
$1,146American Airlines
Wed, Jul 1 - Wed, Jul 29
American Airlines Logo
6:36 am - 5:00 am
STL
-
BNE
31h 24m
1 stop
American Airlines Logo
8:35 pm - 8:31 am
BNE
-
STL
26h 56m
2 stops
$1,156American Airlines
Wed, Jul 1 - Wed, Jul 29
Multiple Airlines Logo
6:08 pm - 1:15 pm
STL
-
HBA
51h 07m
2 stops
Multiple Airlines Logo
9:00 pm - 11:58 pm
HBA
-
STL
42h 58m
2 stops
$1,447Multiple Airlines
Tue, Mar 24 - Tue, Mar 31
Multiple Airlines Logo
6:38 am - 4:50 pm
STL
-
CNS
43h 12m
2 stops
Multiple Airlines Logo
6:10 pm - 11:58 pm
CNS
-
STL
44h 48m
2 stops
$1,515Multiple Airlines
Sun, Mar 22 - Sun, Mar 29
United Airlines Logo
5:25 pm - 1:40 pm
STL
-
CBR
27h 15m
2 stops
United Airlines Logo
6:30 am - 4:44 pm
CBR
-
STL
27h 14m
2 stops
$1,630United Airlines
Mon, Feb 23 - Fri, Feb 27
United Airlines Logo
5:25 pm - 1:40 pm
STL
-
CBR
27h 15m
2 stops
United Airlines Logo
6:30 am - 4:44 pm
CBR
-
STL
27h 14m
2 stops
$1,631United Airlines
Mon, Feb 23 - Fri, Feb 27

Qantas Airways flights from St. Louis to Australia

Our best Qantas Airways deals on St. Louis to Australia flight tickets
Qantas Airways
Feb 11
STL7:04 amLambert-St Louis
32h 56m
1 stop
SYD9:00 amSydney Kingsford Smith
Feb 20
SYD7:05 amSydney Kingsford Smith
33h 54m
2 stops
STL11:59 pmLambert-St Louis
$892
Qantas Airways
Mar 9
STL6:50 pmLambert-St Louis
34h 00m
2 stops
SYD8:50 pmSydney Kingsford Smith
Mar 16
SYD11:20 amSydney Kingsford Smith
28h 38m
1 stop
STL11:58 pmLambert-St Louis
$903
Qantas Airways
Mar 23
STL6:50 pmLambert-St Louis
34h 00m
2 stops
SYD8:50 pmSydney Kingsford Smith
Mar 30
SYD6:50 pmSydney Kingsford Smith
21h 08m
1 stop
STL11:58 pmLambert-St Louis
$911

Air Canada flights from St. Louis to Australia

Our best Air Canada deals on St. Louis to Australia flight tickets
Air Canada
May 23
STL1:00 pmLambert-St Louis
51h 05m
2 stops
BNE7:05 amBrisbane
Jun 5
BNE10:00 amBrisbane
49h 05m
2 stops
STL8:05 pmLambert-St Louis
$937
Air Canada
May 23
STL7:30 amLambert-St Louis
37h 00m
3 stops
BNE11:30 amBrisbane
Jun 5
BNE10:00 amBrisbane
25h 05m
2 stops
STL8:05 pmLambert-St Louis
$1,084
Air Canada
Mar 6
STL6:05 pmLambert-St Louis
46h 40m
2 stops
BNE8:45 amBrisbane
Mar 13
BNE9:45 amBrisbane
44h 44m
2 stops
STL3:29 pmLambert-St Louis
$1,117

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 February 8, 2026.
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. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 3/9

6:50 pm-8:50 pm

2 stops34h 00m

Sydney Kingsford Smith

Mon 3/16

11:20 am-11:58 pm

1 stop28h 38m

$903

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 3/23

6:50 pm-8:50 pm

2 stops34h 00m

Sydney Kingsford Smith

Mon 3/30

6:50 pm-11:58 pm

1 stop21h 08m

$911

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 5/23

1:00 pm-7:05 am

2 stops51h 05m

Brisbane

Fri 6/5

10:00 am-8:05 pm

2 stops49h 05m

$937

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 5/23

7:30 am-11:30 am

3 stops37h 00m

Brisbane

Fri 6/5

10:00 am-8:05 pm

2 stops25h 05m

$1,084

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Wed 7/1

12:45 pm-5:00 am

2 stops25h 15m

Brisbane

Wed 7/29

8:35 pm-8:31 am

2 stops26h 56m

$1,146

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Wed 7/1

6:36 am-5:00 am

1 stop31h 24m

Brisbane

Wed 7/29

8:35 pm-8:31 am

2 stops26h 56m

$1,156

St. LouisHobart

STL - HBA

STLHBA

Lambert-St Louis

Tue 3/24

6:08 pm-1:15 pm

2 stops51h 07m

Hobart

Tue 3/31

9:00 pm-11:58 pm

2 stops42h 58m

$1,447

St. LouisCairns

STL - CNS

STLCNS

Lambert-St Louis

Sun 3/22

6:38 am-4:50 pm

2 stops43h 12m

Cairns

Sun 3/29

6:10 pm-11:58 pm

2 stops44h 48m

$1,515

St. LouisCanberra

STL - CBR

STLCBR

Lambert-St Louis

Mon 2/23

5:25 pm-1:40 pm

2 stops27h 15m

Canberra

Fri 2/27

6:30 am-4:44 pm

2 stops27h 14m

$1,630

St. LouisCanberra

STL - CBR

STLCBR

Lambert-St Louis

Mon 2/23

5:25 pm-1:40 pm

2 stops27h 15m

Canberra

Fri 2/27

6:30 am-4:44 pm

2 stops27h 14m

$1,631

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 March instead. Flights to Australia in March, while not as cheap as those in August, still average around $1,299.

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 42m

Direct flights

None
The fastest flight from St. Louis to Australia takes 21h 42m
There are no direct flights from St. Louis to Australia. There are no popular flight routes from St. Louis to Australia.
Search flight deals

  • 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 $608Free CancellationRating
7.1
10,697 reviews
Search Air Canada flights
Qantas AirwaysPriceFrom $975Free CancellationRating
7.5
988 reviews
Search Qantas Airways flights
United AirlinesPriceFrom $1,027Free CancellationRating
7.4
9,254 reviews
Search United Airlines flights
American AirlinesPriceFrom $1,118Free CancellationRating
7.2
11,249 reviews
Search American Airlines flights
Fiji AirwaysPriceFrom $1,132Free CancellationRating
8.0
223 reviews
Search Fiji Airways 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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