What airlines fly to Australia?

United Airlines, Qantas Airways and American Airlines are the top three most popular airlines that fly to Australia from St. Louis according to our data. United Airlines is the first choice among our users, with 38% of people opting to fly with this airline when traveling to Australia. Keep in mind that there are 5 different airlines that fly to Australia on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Lambert-St Louis to Australia?

Qantas Airways and American Airlines are the most popular carriers operating from Lambert-St Louis to Australia

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?

There are 5 operators available for flights from Lambert-St Louis Airport to Australia as of February 2026.

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.

$603 Cheap Flights from St. Louis to Australia in 2026

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Find the cheapest flights from St. Louis to Australia

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:50 pm - 8:20 am

STL

MEL

45h 30m

2 stops

12:00 pm - 11:58 pm

MEL

STL

27h 58m

1 stop

$906Qantas Airways

Wed, Mar 18 - Wed, Mar 25

4:13 pm - 8:50 pm

STL

SYD

35h 37m

2 stops

11:20 am - 11:58 pm

SYD

STL

28h 38m

1 stop

$906Qantas Airways

Tue, Mar 3 - Tue, Mar 10

1:00 pm - 7:05 am

STL

BNE

51h 05m

2 stops

10:00 am - 8:05 pm

BNE

STL

25h 05m

2 stops

$960Air Canada

Sat, May 23 - Tue, Jun 9

1:00 pm - 7:05 am

STL

BNE

51h 05m

2 stops

10:00 am - 8:05 pm

BNE

STL

25h 05m

2 stops

$1,003Air Canada

Sat, May 23 - Fri, Jun 5

2:22 pm - 8:00 am

STL

MEL

24h 38m

2 stops

9:10 am - 11:58 pm

MEL

STL

30h 48m

2 stops

$1,175Delta

Wed, Mar 4 - Wed, Mar 11

10:12 am - 8:50 am

STL

MEL

30h 38m

2 stops

10:00 am - 9:19 pm

MEL

STL

26h 19m

2 stops

$1,225Delta

Fri, Apr 3 - Sun, Apr 19

4:13 pm - 9:30 am

STL

MEL

25h 17m

2 stops

12:00 pm - 11:58 pm

MEL

STL

27h 58m

1 stop

$1,274American Airlines

Thu, Mar 12 - Sat, Mar 21

6:38 am - 9:30 am

STL

MEL

34h 52m

1 stop

12:00 pm - 11:58 pm

MEL

STL

27h 58m

1 stop

$1,280American Airlines

Thu, Mar 12 - Sat, Mar 21

7:05 pm - 9:15 am

STL

MEL

22h 10m

1 stop

10:55 am - 6:24 pm

MEL

STL

22h 29m

1 stop

$1,293United Airlines

Fri, Apr 3 - Sun, Apr 19

9:00 am - 9:00 am

STL

MEL

32h 00m

2 stops

12:00 pm - 9:05 pm

MEL

STL

25h 05m

2 stops

$1,296United Airlines

Thu, Mar 12 - Sat, Mar 21

Qantas Airways flights from St. Louis to Australia

Our best Qantas Airways deals on St. Louis to Australia flight tickets

Qantas Airways

Mar 3

STL4:13 pmLambert-St Louis

35h 37m

2 stops

SYD8:50 pmSydney Kingsford Smith

Mar 10

SYD11:20 amSydney Kingsford Smith

28h 38m

1 stop

STL11:58 pmLambert-St Louis

$906

Qantas Airways

Feb 4

STL5:04 pmLambert-St Louis

34h 46m

2 stops

SYD8:50 pmSydney Kingsford Smith

Feb 10

SYD5:45 pmSydney Kingsford Smith

23h 14m

1 stop

STL11:59 pmLambert-St Louis

$914

Qantas Airways

Feb 5

STL7:04 amLambert-St Louis

32h 56m

1 stop

SYD9:00 amSydney Kingsford Smith

Feb 7

SYD1:05 pmSydney Kingsford Smith

42h 42m

2 stops

STL2:47 pmLambert-St Louis

$915

American Airlines flights from St. Louis to Australia

Our best American Airlines deals on St. Louis to Australia flight tickets

American Airlines

May 24

STL6:36 amLambert-St Louis

31h 24m

1 stop

BNE5:00 amBrisbane

Jun 8

BNE8:35 pmBrisbane

26h 56m

2 stops

STL8:31 amLambert-St Louis

$1,157

American Airlines

Feb 13

STL6:38 amLambert-St Louis

30h 22m

1 stop

BNE5:00 amBrisbane

Feb 20

BNE9:40 amBrisbane

25h 49m

1 stop

STL7:29 pmLambert-St Louis

$1,199

American Airlines

Feb 13

STL6:38 amLambert-St Louis

30h 22m

1 stop

BNE5:00 amBrisbane

Feb 20

BNE9:40 amBrisbane

25h 49m

1 stop

STL7:29 pmLambert-St Louis

$1,200

Fly from

Fly to

Route

Depart

Return

Price

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Wed 3/18

6:50 pm-8:20 am

2 stops45h 30m

Melbourne

Wed 3/25

12:00 pm-11:58 pm

1 stop27h 58m

$906

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 3/3

4:13 pm-8:50 pm

2 stops35h 37m

Sydney Kingsford Smith

Tue 3/10

11:20 am-11:58 pm

1 stop28h 38m

$906

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sat 5/23

1:00 pm-7:05 am

2 stops51h 05m

Brisbane

Tue 6/9

10:00 am-8:05 pm

2 stops25h 05m

$960

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 stops25h 05m

$1,003

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Wed 3/4

2:22 pm-8:00 am

2 stops24h 38m

Melbourne

Wed 3/11

9:10 am-11:58 pm

2 stops30h 48m

$1,175

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Fri 4/3

10:12 am-8:50 am

2 stops30h 38m

Melbourne

Sun 4/19

10:00 am-9:19 pm

2 stops26h 19m

$1,225

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Thu 3/12

4:13 pm-9:30 am

2 stops25h 17m

Melbourne

Sat 3/21

12:00 pm-11:58 pm

1 stop27h 58m

$1,274

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Thu 3/12

6:38 am-9:30 am

1 stop34h 52m

Melbourne

Sat 3/21

12:00 pm-11:58 pm

1 stop27h 58m

$1,280

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Fri 4/3

7:05 pm-9:15 am

1 stop22h 10m

Melbourne

Sun 4/19

10:55 am-6:24 pm

1 stop22h 29m

$1,293

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Thu 3/12

9:00 am-9:00 am

2 stops32h 00m

Melbourne

Sat 3/21

12:00 pm-9:05 pm

2 stops25h 05m

$1,296

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

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

Prices

Airlines

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 $1,205. 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 $1,344.

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 $1,436 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 $948 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

Fastest flight time	23h 57m
Direct flights	None

The fastest flight from St. Louis to Australia takes 23h 57m

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?
There are 5 operators available for flights from Lambert-St Louis Airport to Australia as of February 2026.
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 Canada	PriceFrom $608	Free Cancellation	Rating 7.1 10,684 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $975	Free Cancellation	Rating 7.5 986 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $1,027	Free Cancellation	Rating 7.4 9,236 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,118	Free Cancellation	Rating 7.2 11,218 reviews	Search American Airlines flights
Fiji Airways	PriceFrom $1,132	Free Cancellation	Rating 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.