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?

United Airlines, American 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 July 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

Discover deals from 900+ travel sites with momondo.

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.

6:00 am - 7:05 am

STL

SYD

34h 05m

1 stop

9:10 am - 10:59 pm

SYD

STL

28h 49m

1 stop

$1,131Qantas Airways

Wed, Aug 12 - Sun, Aug 30

7:22 pm - 6:55 am

STL

SYD

20h 33m

1 stop

5:50 pm - 10:59 pm

SYD

STL

20h 09m

1 stop

$1,146Qantas Airways

Mon, Aug 3 - Mon, Aug 10

8:42 am - 6:55 am

STL

SYD

31h 13m

1 stop

10:20 am - 5:59 pm

SYD

STL

22h 39m

1 stop

$1,186United Airlines

Wed, Aug 12 - Sun, Aug 30

10:16 am - 5:00 am

STL

MEL

27h 44m

1 stop

9:45 am - 10:59 pm

MEL

STL

28h 14m

1 stop

$1,188American Airlines

Wed, Aug 19 - Wed, Aug 26

1:13 pm - 6:55 am

STL

SYD

26h 42m

2 stops

9:30 am - 5:06 pm

SYD

STL

22h 36m

2 stops

$1,190United Airlines

Wed, Jul 29 - Wed, Aug 19

12:52 pm - 6:50 am

STL

SYD

26h 58m

2 stops

9:15 am - 11:58 pm

SYD

STL

29h 43m

2 stops

$1,191Delta

Wed, Aug 12 - Sun, Aug 30

8:48 am - 5:00 am

STL

MEL

28h 12m

1 stop

11:15 pm - 8:58 am

MEL

STL

26h 43m

2 stops

$1,193American Airlines

Tue, Oct 27 - Wed, Nov 11

7:20 pm - 8:50 am

STL

MEL

45h 30m

2 stops

12:00 pm - 8:41 pm

MEL

STL

25h 41m

2 stops

$1,211Delta

Tue, Oct 20 - Tue, Nov 3

12:10 pm - 7:05 am

STL

BNE

51h 55m

2 stops

10:00 am - 12:40 pm

BNE

STL

41h 40m

2 stops

$1,392Air Canada

Mon, Aug 3 - Mon, Aug 31

12:10 pm - 7:05 am

STL

BNE

51h 55m

2 stops

10:00 am - 12:40 pm

BNE

STL

41h 40m

2 stops

$1,393Air Canada

Mon, Aug 3 - Mon, Aug 31

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Qantas Airways flights from St. Louis to Australia

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

Qantas Airways

Aug 12

STL6:00 amLambert-St Louis

34h 05m

1 stop

SYD7:05 amSydney Kingsford Smith

Aug 30

SYD9:10 amSydney Kingsford Smith

28h 49m

1 stop

STL10:59 pmLambert-St Louis

$1,131

Qantas Airways

Aug 3

STL7:22 pmLambert-St Louis

20h 33m

1 stop

SYD6:55 amSydney Kingsford Smith

Aug 10

SYD5:50 pmSydney Kingsford Smith

20h 09m

1 stop

STL10:59 pmLambert-St Louis

$1,146

Qantas Airways

Aug 12

STL6:00 amLambert-St Louis

34h 30m

1 stop

SYD7:30 amSydney Kingsford Smith

Aug 30

SYD9:10 amSydney Kingsford Smith

28h 49m

1 stop

STL10:59 pmLambert-St Louis

$1,150

United Airlines flights from St. Louis to Australia

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

United Airlines

Aug 12

STL8:42 amLambert-St Louis

31h 13m

1 stop

SYD6:55 amSydney Kingsford Smith

Aug 30

SYD10:20 amSydney Kingsford Smith

22h 39m

1 stop

STL5:59 pmLambert-St Louis

$1,186

United Airlines

Jul 29

STL1:13 pmLambert-St Louis

26h 42m

2 stops

SYD6:55 amSydney Kingsford Smith

Aug 19

SYD9:30 amSydney Kingsford Smith

22h 36m

2 stops

STL5:06 pmLambert-St Louis

$1,190

United Airlines

Oct 27

STL7:05 pmLambert-St Louis

22h 25m

1 stop

MEL9:30 amMelbourne

Nov 11

MEL12:45 pmMelbourne

26h 25m

1 stop

STL10:10 pmLambert-St Louis

$1,199

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 8/12

6:00 am-7:05 am

1 stop34h 05m

Sydney Kingsford Smith

Sun 8/30

9:10 am-10:59 pm

1 stop28h 49m

$1,131

Quickest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 8/3

7:22 pm-6:55 am

1 stop20h 33m

Sydney Kingsford Smith

Mon 8/10

5:50 pm-10:59 pm

1 stop20h 09m

$1,146

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 8/12

8:42 am-6:55 am

1 stop31h 13m

Sydney Kingsford Smith

Sun 8/30

10:20 am-5:59 pm

1 stop22h 39m

$1,186

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Wed 8/19

10:16 am-5:00 am

1 stop27h 44m

Melbourne

Wed 8/26

9:45 am-10:59 pm

1 stop28h 14m

$1,188

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 7/29

1:13 pm-6:55 am

2 stops26h 42m

Sydney Kingsford Smith

Wed 8/19

9:30 am-5:06 pm

2 stops22h 36m

$1,190

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 8/12

12:52 pm-6:50 am

2 stops26h 58m

Sydney Kingsford Smith

Sun 8/30

9:15 am-11:58 pm

2 stops29h 43m

$1,191

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 10/27

8:48 am-5:00 am

1 stop28h 12m

Melbourne

Wed 11/11

11:15 pm-8:58 am

2 stops26h 43m

$1,193

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 10/20

7:20 pm-8:50 am

2 stops45h 30m

Melbourne

Tue 11/3

12:00 pm-8:41 pm

2 stops25h 41m

$1,211

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 8/3

12:10 pm-7:05 am

2 stops51h 55m

Brisbane

Mon 8/31

10:00 am-12:40 pm

2 stops41h 40m

$1,392

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 8/3

12:10 pm-7:05 am

2 stops51h 55m

Brisbane

Mon 8/31

10:00 am-12:40 pm

2 stops41h 40m

$1,393

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 24m
Direct flights	None

The fastest flight from St. Louis to Australia takes 20h 24m

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 July 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 $894	Free Cancellation	Rating 7.1 11,323 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $998	Free Cancellation	Rating 7.5 1,059 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $1,029	Free Cancellation	Rating 7.4 9,965 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,056	Free Cancellation	Rating 7.1 11,797 reviews	Search American Airlines flights
Fiji Airways	PriceFrom $1,265	Free Cancellation	Rating 8.1 246 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.