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Cheap flights from St. Louis to Australia from $940

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 22/1. 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.
Air Canada Logo
16:05 - 08:45STL-BNE
48h 40m2 stops
Air Canada Logo
10:45 - 15:29BNE-STL
44h 44m2 stops
$1,436Air Canada
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Tue, 27 Jan - Fri, 13 Feb
Air Canada Logo
16:05 - 08:45STL-BNE
48h 40m2 stops
Air Canada Logo
10:45 - 15:29BNE-STL
44h 44m2 stops
$1,437Air Canada
Find Deal
Tue, 27 Jan - Fri, 13 Feb
Air Canada Logo
16:05 - 08:45STL-BNE
48h 40m2 stops
Air Canada Logo
10:45 - 15:29BNE-STL
44h 44m2 stops
$1,439Air Canada
Find Deal
Tue, 27 Jan - Fri, 13 Feb
Multiple Airlines Logo
13:30 - 07:20STL-SYD
26h 50m2 stops
Multiple Airlines Logo
09:20 - 18:25SYD-STL
48h 05m2 stops
$1,458Multiple Airlines
Find Deal
Wed, 6 May - Tue, 26 May
Multiple Airlines Logo
13:30 - 07:20STL-SYD
26h 50m2 stops
Multiple Airlines Logo
09:20 - 18:25SYD-STL
48h 05m3 stops
$1,469Multiple Airlines
Find Deal
Wed, 6 May - Tue, 26 May
Qantas Airways Logo
17:04 - 17:10STL-BNE
32h 06m2 stops
Qantas Airways Logo
19:40 - 23:48BNE-STL
20h 08m1 stop
$1,472Qantas Airways
Find Deal
Tue, 27 Jan - Fri, 13 Feb
Qantas Airways Logo
17:04 - 17:10STL-BNE
32h 06m2 stops
Qantas Airways Logo
19:40 - 23:48BNE-STL
20h 08m1 stop
$1,477Qantas Airways
Find Deal
Tue, 27 Jan - Fri, 13 Feb
American Airlines Logo
15:37 - 09:30STL-MEL
24h 53m2 stops
American Airlines Logo
16:05 - 23:28MEL-STL
24h 23m2 stops
$1,732American Airlines
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Mon, 2 Feb - Mon, 2 Mar
United Airlines Logo
19:06 - 09:15STL-MEL
22h 09m1 stop
United Airlines Logo
10:55 - 18:22MEL-STL
22h 27m1 stop
$1,761United Airlines
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Tue, 31 Mar - Sun, 19 Apr
United Airlines Logo
19:06 - 09:15STL-MEL
22h 09m1 stop
United Airlines Logo
09:30 - 19:26MEL-STL
24h 56m2 stops
$1,768United Airlines
Find Deal
Tue, 31 Mar - Sun, 19 Apr

Delta flights from St. Louis to Australia

Our best Delta deals on St. Louis to Australia flight tickets
Delta
28 Jan
STL07:10Lambert-St Louis
33h 10m
2 stops
BNE08:20Brisbane
11 Feb
BNE11:05Brisbane
25h 32m
2 stops
STL20:37Lambert-St Louis
$1,570
Find similar
Delta
28 Jan
STL13:00Lambert-St Louis
27h 20m
2 stops
BNE08:20Brisbane
15 Feb
BNE10:40Brisbane
29h 45m
2 stops
STL00:25Lambert-St Louis
$1,577
Find similar
Delta
4 May
STL14:18Lambert-St Louis
25h 17m
2 stops
SYD06:35Sydney Kingsford Smith
18 May
SYD09:25Sydney Kingsford Smith
29h 13m
2 stops
STL23:38Lambert-St Louis
$1,779
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American Airlines flights from St. Louis to Australia

Our best American Airlines deals on St. Louis to Australia flight tickets
American Airlines
27 Jan
STL15:40Lambert-St Louis
22h 50m
1 stop
BNE06:30Brisbane
13 Feb
BNE19:40Brisbane
20h 08m
1 stop
STL23:48Lambert-St Louis
$1,559
Find similar
American Airlines
5 Dec
STL09:30Lambert-St Louis
29h 00m
1 stop
BNE06:30Brisbane
18 Dec
BNE12:10Brisbane
27h 41m
1 stop
STL23:51Lambert-St Louis
$1,568
Find similar
American Airlines
5 Dec
STL14:37Lambert-St Louis
23h 08m
2 stops
BNE05:45Brisbane
18 Dec
BNE12:10Brisbane
26h 46m
2 stops
STL22:56Lambert-St Louis
$1,574
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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 1 December 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

Tue 27/1

16:05-08:45

2 stops48h 40m

Brisbane

Fri 13/2

10:45-15:29

2 stops44h 44m

$1,436

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Tue 27/1

16:05-08:45

2 stops48h 40m

Brisbane

Fri 13/2

10:45-15:29

2 stops44h 44m

$1,437

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Tue 27/1

16:05-08:45

2 stops48h 40m

Brisbane

Fri 13/2

10:45-15:29

2 stops44h 44m

$1,439

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 6/5

13:30-07:20

2 stops26h 50m

Sydney Kingsford Smith

Tue 26/5

09:20-18:25

2 stops48h 05m

$1,458

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 6/5

13:30-07:20

2 stops26h 50m

Sydney Kingsford Smith

Tue 26/5

09:20-18:25

3 stops48h 05m

$1,469

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Tue 27/1

17:04-17:10

2 stops32h 06m

Brisbane

Fri 13/2

19:40-23:48

1 stop20h 08m

$1,472

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Tue 27/1

17:04-17:10

2 stops32h 06m

Brisbane

Fri 13/2

19:40-23:48

1 stop20h 08m

$1,477

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 2/2

15:37-09:30

2 stops24h 53m

Melbourne

Mon 2/3

16:05-23:28

2 stops24h 23m

$1,732

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 31/3

19:06-09:15

1 stop22h 09m

Melbourne

Sun 19/4

10:55-18:22

1 stop22h 27m

$1,761

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 31/3

19:06-09:15

1 stop22h 09m

Melbourne

Sun 19/4

09:30-19:26

2 stops24h 56m

$1,768

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 $1,945. 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 $2,031.

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 $1,912. 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 $2,691. 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 $2,224 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 $1,446 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

20h 51m

Direct flights

None
The fastest flight from St. Louis to Australia takes 20h 51m
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 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 $2,158Free cancellationRating
7.4
9,056 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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