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Cheap flights from St. Louis to Australia from $578

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 11/18. 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

United Airlines Logo
1:35 pm - 7:30 amSTL-BNE
25h 55m2 stops
United Airlines Logo
11:40 am - 9:54 pmBNE-STL
26h 14m2 stops
$990United Airlines
Find Deal
Mon, Nov 3 - Wed, Nov 19
United Airlines Logo
10:00 am - 7:30 amSTL-BNE
29h 30m2 stops
United Airlines Logo
11:40 am - 4:27 pmBNE-STL
20h 47m1 stop
$994United Airlines
Find Deal
Mon, Nov 3 - Wed, Nov 19
Qantas Airways Logo
1:48 pm - 6:30 amSTL-BNE
24h 42m1 stop
Qantas Airways Logo
9:40 am - 1:58 pmBNE-STL
20h 18m1 stop
$1,023Qantas Airways
Find Deal
Sat, Feb 7 - Sat, Feb 21
Qantas Airways Logo
5:54 pm - 6:30 amSTL-BNE
20h 36m1 stop
Qantas Airways Logo
9:40 am - 1:58 pmBNE-STL
20h 18m1 stop
$1,075Qantas Airways
Find Deal
Sat, Feb 7 - Sun, Feb 22
Fiji Airways Logo
5:58 pm - 12:30 pmSTL-SYD
25h 32m2 stops
Fiji Airways Logo
2:10 pm - 7:30 pmSYD-STL
22h 20m2 stops
$1,145Fiji Airways
Find Deal
Tue, Nov 11 - Tue, Nov 25
American Airlines Logo
10:22 am - 5:00 amSTL-MEL
26h 38m2 stops
American Airlines Logo
4:05 pm - 10:29 pmMEL-STL
23h 24m1 stop
$1,256American Airlines
Find Deal
Fri, Oct 31 - Fri, Nov 7
American Airlines Logo
12:23 pm - 9:30 amSTL-MEL
29h 07m2 stops
American Airlines Logo
12:00 pm - 11:42 pmMEL-STL
28h 42m1 stop
$1,266American Airlines
Find Deal
Thu, Oct 30 - Thu, Nov 6
Air New Zealand Logo
8:25 am - 7:45 amSTL-BNE
32h 20m2 stops
Air New Zealand Logo
8:20 am - 6:47 pmBNE-STL
26h 27m2 stops
$1,328Air New Zealand
Find Deal
Thu, Oct 23 - Fri, Nov 7
Air New Zealand Logo
8:20 am - 10:55 amSTL-MEL
34h 35m2 stops
Air New Zealand Logo
10:35 am - 6:47 pmMEL-STL
25h 12m2 stops
$1,331Air New Zealand
Find Deal
Fri, Oct 31 - Fri, Nov 7
Fiji Airways Logo
6:13 pm - 11:35 amSTL-CNS
25h 22m2 stops
Fiji Airways Logo
12:35 pm - 11:42 pmCNS-STL
27h 07m2 stops
$1,446Fiji Airways
Find Deal
Thu, Nov 13 - Mon, Nov 17

Fiji Airways flights from St. Louis to Australia

Our best Fiji Airways deals on St. Louis to Australia flight tickets
Fiji Airways
Nov 11
STL5:58 pmLambert-St Louis
25h 32m
2 stops
SYD12:30 pmSydney Kingsford Smith
Nov 25
SYD2:10 pmSydney Kingsford Smith
22h 20m
2 stops
STL7:30 pmLambert-St Louis
$1,145
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
$1,446
Find similar
Fiji Airways
Sep 30
STL3:59 pmLambert-St Louis
27h 26m
2 stops
BNE10:25 amBrisbane
Oct 28
BNE11:35 amBrisbane
24h 18m
2 stops
STL8:53 pmLambert-St Louis
$1,455
Find similar

Alaska Airlines flights from St. Louis to Australia

Our best Alaska Airlines deals on St. Louis to Australia flight tickets
Alaska Airlines
Feb 1
STL2:55 pmLambert-St Louis
35h 50m
2 stops
SYD7:45 pmSydney Kingsford Smith
Feb 14
SYD9:40 pmSydney Kingsford Smith
33h 12m
2 stops
STL1:52 pmLambert-St Louis
$1,168
Find similar
Alaska Airlines
Oct 30
STL4:14 pmLambert-St Louis
35h 31m
2 stops
SYD7:45 pmSydney Kingsford Smith
Nov 6
SYD9:40 pmSydney Kingsford Smith
34h 38m
2 stops
STL3:18 pmLambert-St Louis
$1,176
Find similar
Alaska Airlines
Oct 16
STL3:57 pmLambert-St Louis
35h 48m
2 stops
SYD7:45 pmSydney Kingsford Smith
Oct 23
SYD9:40 pmSydney Kingsford Smith
33h 21m
2 stops
STL3:01 pmLambert-St Louis
$1,248
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 September 17, 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

Mon 11/3

1:35 pm-7:30 am

2 stops25h 55m

Brisbane

Wed 11/19

11:40 am-9:54 pm

2 stops26h 14m

$990

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 11/3

10:00 am-7:30 am

2 stops29h 30m

Brisbane

Wed 11/19

11:40 am-4:27 pm

1 stop20h 47m

$994

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 2/7

1:48 pm-6:30 am

1 stop24h 42m

Brisbane

Sat 2/21

9:40 am-1:58 pm

1 stop20h 18m

$1,023

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 2/7

5:54 pm-6:30 am

1 stop20h 36m

Brisbane

Sun 2/22

9:40 am-1:58 pm

1 stop20h 18m

$1,075

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 11/11

5:58 pm-12:30 pm

2 stops25h 32m

Sydney Kingsford Smith

Tue 11/25

2:10 pm-7:30 pm

2 stops22h 20m

$1,145

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Fri 10/31

10:22 am-5:00 am

2 stops26h 38m

Melbourne

Fri 11/7

4:05 pm-10:29 pm

1 stop23h 24m

$1,256

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Thu 10/30

12:23 pm-9:30 am

2 stops29h 07m

Melbourne

Thu 11/6

12:00 pm-11:42 pm

1 stop28h 42m

$1,266

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Thu 10/23

8:25 am-7:45 am

2 stops32h 20m

Brisbane

Fri 11/7

8:20 am-6:47 pm

2 stops26h 27m

$1,328

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Fri 10/31

8:20 am-10:55 am

2 stops34h 35m

Melbourne

Fri 11/7

10:35 am-6:47 pm

2 stops25h 12m

$1,331

St. LouisCairns

STL - CNS

STLCNS

Lambert-St Louis

Thu 11/13

6:13 pm-11:35 am

2 stops25h 22m

Cairns

Mon 11/17

12:35 pm-11:42 pm

2 stops27h 07m

$1,446

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 $1,266. 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 $1,359.

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 $1,472 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 $1,295 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

Direct flights

None
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
Qantas AirwaysPriceFrom $687Free CancellationRating
7.5
907 reviews
Search Qantas Airways flights
Fiji AirwaysPriceFrom $887Free CancellationRating
8.0
205 reviews
Search Fiji Airways flights
Air CanadaPriceFrom $897Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
United AirlinesPriceFrom $1,029Free CancellationRating
7.4
8,926 reviews
Search United Airlines flights
Air New ZealandPriceFrom $1,173Free CancellationRating
8.0
505 reviews
Search Air New Zealand flights
American AirlinesPriceFrom $1,260Free 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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