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Cheap flights from St. Louis to Australia from $857

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 5/3. 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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Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
14:45 - 08:45STL-BNE
26h 00m2 stops
Multiple Airlines Logo
10:45 - 15:29BNE-STL
44h 44m2 stops
$1,441Multiple Airlines
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Sun, 1 Feb - Sun, 15 Feb
Multiple Airlines Logo
14:45 - 08:45STL-BNE
26h 00m2 stops
Multiple Airlines Logo
06:10 - 15:29BNE-STL
49h 19m3 stops
$1,469Multiple Airlines
Find Deal
Sun, 1 Feb - Sun, 15 Feb
Qantas Airways Logo
07:04 - 20:50STL-SYD
44h 46m2 stops
Qantas Airways Logo
17:45 - 23:48SYD-STL
23h 03m1 stop
$1,529Qantas Airways
Find Deal
Sat, 31 Jan - Sat, 28 Feb
Qantas Airways Logo
07:04 - 05:00STL-BNE
29h 56m1 stop
Qantas Airways Logo
18:30 - 16:14BNE-STL
37h 44m2 stops
$1,543Qantas Airways
Find Deal
Fri, 6 Feb - Tue, 10 Feb
Air Canada Logo
16:05 - 09:35STL-SYD
48h 30m2 stops
Air Canada Logo
11:20 - 20:26SYD-STL
26h 06m2 stops
$1,563Air Canada
Find Deal
Sat, 31 Jan - Sat, 28 Feb
American Airlines Logo
07:04 - 05:00STL-BNE
29h 56m1 stop
American Airlines Logo
19:40 - 23:48BNE-STL
20h 08m1 stop
$1,569American Airlines
Find Deal
Sun, 1 Feb - Sun, 15 Feb
American Airlines Logo
09:25 - 05:00STL-BNE
27h 35m2 stops
American Airlines Logo
19:40 - 23:48BNE-STL
20h 08m1 stop
$1,576American Airlines
Find Deal
Sun, 1 Feb - Sun, 15 Feb
Air Canada Logo
13:30 - 07:20STL-SYD
50h 50m3 stops
Air Canada Logo
09:20 - 15:16SYD-STL
44h 56m2 stops
$1,591Air Canada
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Mon, 4 May - Mon, 18 May
United Airlines Logo
17:00 - 07:30STL-BNE
22h 30m1 stop
United Airlines Logo
11:40 - 15:37BNE-STL
19h 57m1 stop
$1,604United Airlines
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Fri, 6 Feb - Tue, 10 Feb
United Airlines Logo
13:30 - 07:00STL-SYD
26h 30m2 stops
United Airlines Logo
10:20 - 18:22SYD-STL
23h 02m1 stop
$1,803United Airlines
Find Deal
Mon, 4 May - Mon, 18 May

Air Canada flights from St. Louis to Australia

Our best Air Canada deals on St. Louis to Australia flight tickets
Air Canada
31 Jan
STL16:05Lambert-St Louis
48h 30m
2 stops
SYD09:35Sydney Kingsford Smith
28 Feb
SYD11:20Sydney Kingsford Smith
26h 06m
2 stops
STL20:26Lambert-St Louis
$1,563
Find similar
Air Canada
4 May
STL13:30Lambert-St Louis
50h 50m
3 stops
SYD07:20Sydney Kingsford Smith
18 May
SYD09:20Sydney Kingsford Smith
44h 56m
2 stops
STL15:16Lambert-St Louis
$1,591
Find similar
Air Canada
10 Jan
STL16:05Lambert-St Louis
48h 40m
2 stops
BNE08:45Brisbane
27 Jan
BNE10:45Brisbane
44h 44m
2 stops
STL15:29Lambert-St Louis
$1,600
Find similar

Qantas Airways flights from St. Louis to Australia

Our best Qantas Airways deals on St. Louis to Australia flight tickets
Qantas Airways
27 Jan
STL17:04Lambert-St Louis
32h 06m
2 stops
BNE17:10Brisbane
13 Feb
BNE19:40Brisbane
20h 08m
1 stop
STL23:48Lambert-St Louis
$1,497
Find similar
Qantas Airways
31 Jan
STL07:04Lambert-St Louis
44h 46m
2 stops
SYD20:50Sydney Kingsford Smith
28 Feb
SYD17:45Sydney Kingsford Smith
23h 03m
1 stop
STL23:48Lambert-St Louis
$1,529
Find similar
Qantas Airways
6 Feb
STL07:04Lambert-St Louis
29h 56m
1 stop
BNE05:00Brisbane
10 Feb
BNE18:30Brisbane
37h 44m
2 stops
STL16:14Lambert-St Louis
$1,543
Find similar

momondo Fare Finder

 
Customise 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 78,305 searches. Data last updated 26 November 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 1/2

14:45-08:45

2 stops26h 00m

Brisbane

Sun 15/2

10:45-15:29

2 stops44h 44m

$1,441

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 1/2

14:45-08:45

2 stops26h 00m

Brisbane

Sun 15/2

06:10-15:29

3 stops49h 19m

$1,469

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 31/1

07:04-20:50

2 stops44h 46m

Sydney Kingsford Smith

Sat 28/2

17:45-23:48

1 stop23h 03m

$1,529

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Fri 6/2

07:04-05:00

1 stop29h 56m

Brisbane

Tue 10/2

18:30-16:14

2 stops37h 44m

$1,543

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 31/1

16:05-09:35

2 stops48h 30m

Sydney Kingsford Smith

Sat 28/2

11:20-20:26

2 stops26h 06m

$1,563

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 1/2

07:04-05:00

1 stop29h 56m

Brisbane

Sun 15/2

19:40-23:48

1 stop20h 08m

$1,569

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 1/2

09:25-05:00

2 stops27h 35m

Brisbane

Sun 15/2

19:40-23:48

1 stop20h 08m

$1,576

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

13:30-07:20

3 stops50h 50m

Sydney Kingsford Smith

Mon 18/5

09:20-15:16

2 stops44h 56m

$1,591

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Fri 6/2

17:00-07:30

1 stop22h 30m

Brisbane

Tue 10/2

11:40-15:37

1 stop19h 57m

$1,604

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

13:30-07:00

2 stops26h 30m

Sydney Kingsford Smith

Mon 18/5

10:20-18:22

1 stop23h 02m

$1,803

Flights are sorted by cheapest return 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?

In general, August is the cheapest month to fly from St. Louis to Australia. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,973. If you don’t want to visit Australia in August, then you should wait until October to fly from St. Louis, when ticket prices are also cheap, with an average price of $2,060.

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

According to our data, the cheapest time of day to fly to Australia is in the afternoon. momondo users have found flights departing from St. Louis to Australia in the afternoon for as low as $1,940. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights to Australia are more costly in the morning, with an average ticket price of $2,730. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

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 $2,256 when searching weeks before you fly. 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 $1,467 on momondo.

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

You could potentially save up to 2% 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 are refreshed on a daily basis.

  • 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 for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and stopovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Australia.

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

    The travel and health documents you'll need for your trip to Australia may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's licence and a passport that is valid for six months after your intended arrival at Australia. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

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
United AirlinesPriceFrom $2,190Free cancellationRating
7.4
9,046 reviews
Search United Airlines flights

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Australia. momondo saves you time and could save you money on your trip.

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?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Australia.

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

Price alerts on flights to Australia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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