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Cheap flights from St. Louis to Australia from $527

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 10/31. 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 round-trip flights

Air Canada Logo
9:00 am - 8:45 amSTL-BNE
31h 45m2 stops
Air Canada Logo
10:45 am - 3:29 pmBNE-STL
44h 44m2 stops
$992Air Canada
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Wed, Nov 19 - Tue, Nov 25
Air Canada Logo
4:05 pm - 8:45 amSTL-BNE
48h 40m2 stops
Air Canada Logo
10:45 am - 3:29 pmBNE-STL
44h 44m2 stops
$994Air Canada
Find Deal
Fri, Nov 7 - Mon, Nov 24
Qantas Airways Logo
1:20 pm - 6:30 amSTL-BNE
25h 10m1 stop
Qantas Airways Logo
9:40 am - 12:37 pmBNE-STL
18h 57m1 stop
$1,021Qantas Airways
Find Deal
Fri, Nov 7 - Mon, Nov 24
Qantas Airways Logo
6:00 am - 9:00 amSTL-SYD
34h 00m1 stop
Qantas Airways Logo
7:15 pm - 4:14 pmSYD-STL
37h 59m2 stops
$1,031Qantas Airways
Find Deal
Mon, Jan 26 - Mon, Feb 9
United Airlines Logo
5:29 pm - 7:30 amSTL-BNE
22h 01m1 stop
United Airlines Logo
11:40 am - 4:27 pmBNE-STL
20h 47m1 stop
$1,067United Airlines
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Mon, Nov 17 - Thu, Nov 27
United Airlines Logo
1:35 pm - 7:30 amSTL-BNE
25h 55m2 stops
United Airlines Logo
11:40 am - 4:27 pmBNE-STL
20h 47m1 stop
$1,071United Airlines
Find Deal
Mon, Nov 17 - Wed, Nov 26
Fiji Airways Logo
5:54 pm - 9:50 pmSTL-SYD
34h 56m2 stops
Fiji Airways Logo
6:00 am - 11:08 pmSYD-STL
34h 08m2 stops
$1,195Fiji Airways
Find Deal
Sat, Jan 31 - Tue, Feb 17
American Airlines Logo
12:23 pm - 5:25 amSTL-BNE
26h 02m2 stops
American Airlines Logo
7:25 pm - 11:50 pmBNE-STL
20h 25m2 stops
$1,258American Airlines
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Thu, Oct 23 - Fri, Nov 7
American Airlines Logo
8:50 am - 5:00 amSTL-MEL
29h 10m1 stop
American Airlines Logo
3:05 pm - 8:16 pmMEL-STL
20h 11m1 stop
$1,260American Airlines
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Wed, Sep 17 - Sun, Sep 28
Fiji Airways Logo
5:54 pm - 12:30 pmSTL-SYD
25h 36m2 stops
Fiji Airways Logo
6:00 am - 11:08 pmSYD-STL
34h 08m2 stops
$1,270Fiji Airways
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Thu, Jan 29 - Tue, Feb 17

Air New Zealand flights from St. Louis to Australia

Our best Air New Zealand deals on St. Louis to Australia flight tickets
Air New Zealand
Jan 26
STL4:17 pmLambert-St Louis
25h 13m
2 stops
SYD10:30 amSydney Kingsford Smith
Feb 9
SYD11:45 amSydney Kingsford Smith
27h 21m
2 stops
STL10:06 pmLambert-St Louis
$1,132
Find similar
Air New Zealand
Nov 28
STL4:35 pmLambert-St Louis
24h 55m
2 stops
SYD10:30 amSydney Kingsford Smith
Dec 14
SYD11:45 amSydney Kingsford Smith
27h 13m
2 stops
STL9:58 pmLambert-St Louis
$1,140
Find similar
Air New Zealand
Nov 24
STL4:35 pmLambert-St Louis
27h 05m
2 stops
SYD12:40 pmSydney Kingsford Smith
Dec 8
SYD1:55 pmSydney Kingsford Smith
43h 32m
2 stops
STL4:27 pmLambert-St Louis
$1,226
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Fiji Airways flights from St. Louis to Australia

Our best Fiji Airways deals on St. Louis to Australia flight tickets
Fiji Airways
Jan 31
STL5:54 pmLambert-St Louis
34h 56m
2 stops
SYD9:50 pmSydney Kingsford Smith
Feb 17
SYD6:00 amSydney Kingsford Smith
34h 08m
2 stops
STL11:08 pmLambert-St Louis
$1,195
Find similar
Fiji Airways
Jan 29
STL5:54 pmLambert-St Louis
25h 36m
2 stops
SYD12:30 pmSydney Kingsford Smith
Feb 17
SYD6:00 amSydney Kingsford Smith
34h 08m
2 stops
STL11:08 pmLambert-St Louis
$1,270
Find similar
Fiji Airways
Nov 13
STL6:13 pmLambert-St Louis
25h 22m
2 stops
CNS11:35 amCairns
Nov 17
CNS12:35 pmCairns
27h 07m
2 stops
STL11:42 pmLambert-St Louis
$1,287
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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 August 18, 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

Wed 11/19

9:00 am-8:45 am

2 stops31h 45m

Brisbane

Tue 11/25

10:45 am-3:29 pm

2 stops44h 44m

$992

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Fri 11/7

4:05 pm-8:45 am

2 stops48h 40m

Brisbane

Mon 11/24

10:45 am-3:29 pm

2 stops44h 44m

$994

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Fri 11/7

1:20 pm-6:30 am

1 stop25h 10m

Brisbane

Mon 11/24

9:40 am-12:37 pm

1 stop18h 57m

$1,021

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 1/26

6:00 am-9:00 am

1 stop34h 00m

Sydney Kingsford Smith

Mon 2/9

7:15 pm-4:14 pm

2 stops37h 59m

$1,031

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 11/17

5:29 pm-7:30 am

1 stop22h 01m

Brisbane

Thu 11/27

11:40 am-4:27 pm

1 stop20h 47m

$1,067

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 11/17

1:35 pm-7:30 am

2 stops25h 55m

Brisbane

Wed 11/26

11:40 am-4:27 pm

1 stop20h 47m

$1,071

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 1/31

5:54 pm-9:50 pm

2 stops34h 56m

Sydney Kingsford Smith

Tue 2/17

6:00 am-11:08 pm

2 stops34h 08m

$1,195

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Thu 10/23

12:23 pm-5:25 am

2 stops26h 02m

Brisbane

Fri 11/7

7:25 pm-11:50 pm

2 stops20h 25m

$1,258

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Wed 9/17

8:50 am-5:00 am

1 stop29h 10m

Melbourne

Sun 9/28

3:05 pm-8:16 pm

1 stop20h 11m

$1,260

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 1/29

5:54 pm-12:30 pm

2 stops25h 36m

Sydney Kingsford Smith

Tue 2/17

6:00 am-11:08 pm

2 stops34h 08m

$1,270

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 $1,257. If you aren’t able to travel during the month of August, then book flights to Australia from St. Louis during November instead. Flights to Australia in November, while not as cheap as those in August, still average around $1,370.

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 $1,465 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 $1,272 on momondo.

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

You could potentially save up to 44% 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

Best Price Found

$527

Fastest flight time

20h 36m

Direct flights

None

Airports in Australia

5 airports
The best one-way flight to Australia from St. Louis in the past 72 hours is $527. The best round-trip flight deal from St. Louis to Australia found on momondo in the last 72 hours is $992.
The fastest flight from St. Louis to Australia takes 20h 36m
There are no direct flights from St. Louis to Australia. Popular non-direct routes for this connection are Lambert-St Louis Airport - Sydney Kingsford Smith Airport, Lambert-St Louis Airport - Melbourne Airport and Lambert-St Louis Airport - Melbourne Avalon Airport.
There are 5 airports near Australia: Melbourne Avalon (AVV), Canberra (CBR), Melbourne (MEL), Brisbane (BNE), Sydney Kingsford Smith (SYD)
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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
Qantas AirwaysPriceFrom $687Free CancellationRating
7.5
896 reviews
Search Qantas Airways flights
Fiji AirwaysPriceFrom $887Free CancellationRating
8.0
204 reviews
Search Fiji Airways flights
United AirlinesPriceFrom $1,029Free CancellationRating
7.4
8,925 reviews
Search United Airlines flights
Air CanadaPriceFrom $1,078Free CancellationRating
7.1
9,992 reviews
Search Air Canada flights
Air New ZealandPriceFrom $1,173Free CancellationRating
8.0
504 reviews
Search Air New Zealand flights
American AirlinesPriceFrom $1,240Free CancellationRating
7.2
10,000 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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