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 35% 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?

American Airlines, United Airlines, and Qantas Airways 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 May 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.

$551 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.

12:43 pm - 6:45 am

STL

MEL

26h 02m

2 stops

12:00 pm - 3:29 pm

MEL

STL

20h 29m

1 stop

$1,086American Airlines

Tue, Oct 20 - Tue, Nov 3

6:30 am - 6:45 am

STL

MEL

32h 15m

1 stop

12:00 pm - 3:29 pm

MEL

STL

20h 29m

1 stop

$1,090American Airlines

Tue, Oct 20 - Tue, Nov 3

3:33 pm - 5:00 am

STL

MEL

21h 27m

1 stop

11:15 pm - 11:42 pm

MEL

STL

41h 27m

1 stop

$1,097Qantas Airways

Tue, Oct 27 - Wed, Nov 11

3:33 pm - 5:00 am

STL

MEL

21h 27m

1 stop

11:15 pm - 11:42 pm

MEL

STL

41h 27m

1 stop

$1,121Qantas Airways

Tue, Oct 27 - Wed, Nov 11

8:40 am - 7:20 am

STL

SYD

31h 40m

2 stops

9:20 am - 6:41 pm

SYD

STL

48h 21m

2 stops

$1,195Air Canada

Tue, Jun 9 - Wed, Sep 9

2:15 pm - 7:20 am

STL

SYD

26h 05m

2 stops

9:20 am - 6:41 pm

SYD

STL

48h 21m

3 stops

$1,203Air Canada

Tue, Jun 9 - Wed, Sep 9

8:55 am - 7:20 am

STL

SYD

31h 25m

1 stop

9:20 am - 8:39 am

SYD

STL

38h 19m

2 stops

$1,228Multiple Airlines

Sun, Aug 9 - Sun, Aug 23

9:20 am - 7:20 am

STL

SYD

31h 00m

2 stops

9:20 am - 8:39 am

SYD

STL

38h 19m

2 stops

$1,232Multiple Airlines

Sun, Aug 9 - Sun, Aug 23

6:01 am - 12:55 pm

STL

PER

41h 54m

3 stops

11:55 pm - 6:17 pm

PER

STL

31h 22m

2 stops

$2,115United Airlines

Wed, Jul 8 - Wed, Jul 15

6:01 am - 1:15 pm

STL

CBR

40h 14m

3 stops

8:10 am - 6:39 pm

CBR

STL

25h 29m

2 stops

$2,370United Airlines

Sat, Aug 8 - Wed, Aug 12

Air Canada flights from St. Louis to Australia

Our best Air Canada deals on St. Louis to Australia flight tickets

Air Canada

Jun 9

STL8:40 amLambert-St Louis

31h 40m

2 stops

SYD7:20 amSydney Kingsford Smith

Sep 9

SYD9:20 amSydney Kingsford Smith

48h 21m

2 stops

STL6:41 pmLambert-St Louis

$1,195

Air Canada

Jun 9

STL2:15 pmLambert-St Louis

26h 05m

2 stops

SYD7:20 amSydney Kingsford Smith

Sep 9

SYD9:20 amSydney Kingsford Smith

48h 21m

3 stops

STL6:41 pmLambert-St Louis

$1,203

Air Canada

Jun 9

STL2:15 pmLambert-St Louis

26h 05m

1 stop

SYD7:20 amSydney Kingsford Smith

Sep 9

SYD9:20 amSydney Kingsford Smith

24h 21m

2 stops

STL6:41 pmLambert-St Louis

$1,205

Qantas Airways flights from St. Louis to Australia

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

Qantas Airways

Oct 27

STL3:33 pmLambert-St Louis

21h 27m

1 stop

MEL5:00 amMelbourne

Nov 11

MEL11:15 pmMelbourne

41h 27m

1 stop

STL11:42 pmLambert-St Louis

$1,097

Qantas Airways

Oct 27

STL3:33 pmLambert-St Louis

21h 27m

1 stop

MEL5:00 amMelbourne

Nov 11

MEL11:15 pmMelbourne

41h 27m

1 stop

STL11:42 pmLambert-St Louis

$1,121

Qantas Airways

Oct 21

STL6:30 amLambert-St Louis

32h 15m

1 stop

MEL6:45 amMelbourne

Nov 4

MEL11:15 pmMelbourne

41h 27m

1 stop

STL11:42 pmLambert-St Louis

$1,144

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 10/20

12:43 pm-6:45 am

2 stops26h 02m

Melbourne

Tue 11/3

12:00 pm-3:29 pm

1 stop20h 29m

$1,086

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 10/20

6:30 am-6:45 am

1 stop32h 15m

Melbourne

Tue 11/3

12:00 pm-3:29 pm

1 stop20h 29m

$1,090

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 10/27

3:33 pm-5:00 am

1 stop21h 27m

Melbourne

Wed 11/11

11:15 pm-11:42 pm

1 stop41h 27m

$1,097

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 10/27

3:33 pm-5:00 am

1 stop21h 27m

Melbourne

Wed 11/11

11:15 pm-11:42 pm

1 stop41h 27m

$1,121

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 6/9

8:40 am-7:20 am

2 stops31h 40m

Sydney Kingsford Smith

Wed 9/9

9:20 am-6:41 pm

2 stops48h 21m

$1,195

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 6/9

2:15 pm-7:20 am

2 stops26h 05m

Sydney Kingsford Smith

Wed 9/9

9:20 am-6:41 pm

3 stops48h 21m

$1,203

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 8/9

8:55 am-7:20 am

1 stop31h 25m

Sydney Kingsford Smith

Sun 8/23

9:20 am-8:39 am

2 stops38h 19m

$1,228

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 8/9

9:20 am-7:20 am

2 stops31h 00m

Sydney Kingsford Smith

Sun 8/23

9:20 am-8:39 am

2 stops38h 19m

$1,232

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 7/8

6:01 am-12:55 pm

3 stops41h 54m

Perth

Wed 7/15

11:55 pm-6:17 pm

2 stops31h 22m

$2,115

St. LouisCanberra

STL - CBR

STLCBR

Lambert-St Louis

Sat 8/8

6:01 am-1:15 pm

3 stops40h 14m

Canberra

Wed 8/12

8:10 am-6:39 pm

2 stops25h 29m

$2,370

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 May is, on average, the cheapest month to fly to Australia from St. Louis, with most prices found around $310. If you aren’t able to travel during the month of May, then book flights to Australia from St. Louis during December instead. Flights to Australia in December, while not as cheap as those in May, still average around $509.

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

You could potentially save up to 24% 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 32m
Direct flights	None

The fastest flight from St. Louis to Australia takes 20h 32m

There are no direct flights from St. Louis to Australia. There are no popular flight routes from St. Louis to Australia.

Search flight deals

Frequently asked questions about flying from 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 May 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
Qantas Airways	PriceFrom $857	Free Cancellation	Rating 7.5 1,043 reviews	Search Qantas Airways flights
Fiji Airways	PriceFrom $887	Free Cancellation	Rating 8.1 243 reviews	Search Fiji Airways flights
Air Canada	PriceFrom $894	Free Cancellation	Rating 7.1 11,096 reviews	Search Air Canada flights
United Airlines	PriceFrom $1,029	Free Cancellation	Rating 7.4 9,761 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,056	Free Cancellation	Rating 7.1 11,645 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.