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?

Air Canada, 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 April 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.

$523 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.

6:11 pm - 7:20 pm

STL

MEL

34h 09m

2 stops

7:30 am - 10:00 pm

MEL

STL

29h 30m

2 stops

$1,097Multiple Airlines

Sat, May 16 - Sat, Aug 15

7:05 am - 11:05 am

STL

MEL

37h 00m

3 stops

6:00 am - 12:06 pm

MEL

STL

45h 06m

3 stops

$1,200Air Canada

Tue, May 26 - Tue, Jun 2

6:35 am - 9:20 am

STL

SYD

35h 45m

2 stops

12:00 pm - 4:33 pm

SYD

STL

19h 33m

1 stop

$1,388Qantas Airways

Mon, Jun 22 - Wed, Jul 8

6:21 am - 9:35 am

STL

SYD

36h 14m

2 stops

12:00 pm - 5:21 pm

SYD

STL

20h 21m

1 stop

$1,397Qantas Airways

Wed, May 13 - Wed, May 20

3:12 pm - 7:30 am

STL

SYD

25h 18m

2 stops

6:50 pm - 2:26 pm

SYD

STL

35h 36m

2 stops

$1,424Alaska Airlines

Wed, Sep 23 - Wed, Oct 7

3:00 pm - 7:30 am

STL

SYD

25h 30m

2 stops

5:50 pm - 5:03 pm

SYD

STL

38h 13m

2 stops

$1,465Alaska Airlines

Sun, Aug 23 - Wed, Sep 2

7:06 pm - 8:15 am

STL

MEL

22h 09m

1 stop

10:55 am - 6:24 pm

MEL

STL

22h 29m

1 stop

$1,479United Airlines

Mon, May 18 - Tue, Aug 11

7:06 pm - 8:15 am

STL

MEL

22h 09m

1 stop

10:55 am - 6:22 pm

MEL

STL

22h 27m

1 stop

$1,481United Airlines

Sun, May 10 - Wed, May 20

6:02 am - 6:35 pm

STL

PER

47h 33m

2 stops

10:45 pm - 11:59 pm

PER

STL

38h 14m

2 stops

$1,522Qatar Airways

Tue, Aug 18 - Sun, Sep 20

6:02 am - 6:35 pm

STL

PER

47h 33m

2 stops

10:45 pm - 11:59 pm

PER

STL

38h 14m

2 stops

$1,610Qatar Airways

Tue, Aug 18 - Sun, Sep 20

American Airlines flights from St. Louis to Australia

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

American Airlines

May 24

STL2:33 pmLambert-St Louis

25h 32m

2 stops

SYD7:05 amSydney Kingsford Smith

May 31

SYD12:00 pmSydney Kingsford Smith

19h 33m

1 stop

STL4:33 pmLambert-St Louis

$1,496

American Airlines

May 24

STL2:33 pmLambert-St Louis

25h 32m

2 stops

SYD7:05 amSydney Kingsford Smith

May 31

SYD9:10 amSydney Kingsford Smith

22h 20m

2 stops

STL4:30 pmLambert-St Louis

$1,497

American Airlines

Jul 27

STL6:36 amLambert-St Louis

33h 29m

1 stop

SYD7:05 amSydney Kingsford Smith

Aug 15

SYD5:50 pmSydney Kingsford Smith

20h 18m

1 stop

STL11:08 pmLambert-St Louis

$1,566

ANA flights from St. Louis to Australia

Our best ANA deals on St. Louis to Australia flight tickets

ANA

Aug 23

STL1:18 pmLambert-St Louis

29h 07m

2 stops

SYD9:25 amSydney Kingsford Smith

Sep 1

SYD11:45 amSydney Kingsford Smith

40h 04m

2 stops

STL12:49 pmLambert-St Louis

$1,503

ANA

Sep 7

STL9:16 amLambert-St Louis

33h 09m

2 stops

SYD9:25 amSydney Kingsford Smith

Sep 14

SYD8:55 pmSydney Kingsford Smith

32h 13m

2 stops

STL2:08 pmLambert-St Louis

$1,508

ANA

Sep 7

STL9:16 amLambert-St Louis

33h 09m

2 stops

SYD9:25 amSydney Kingsford Smith

Sep 14

SYD8:55 pmSydney Kingsford Smith

32h 13m

2 stops

STL2:08 pmLambert-St Louis

$1,510

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sat 5/16

6:11 pm-7:20 pm

2 stops34h 09m

Melbourne

Sat 8/15

7:30 am-10:00 pm

2 stops29h 30m

$1,097

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 5/26

7:05 am-11:05 am

3 stops37h 00m

Melbourne

Tue 6/2

6:00 am-12:06 pm

3 stops45h 06m

$1,200

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 6/22

6:35 am-9:20 am

2 stops35h 45m

Sydney Kingsford Smith

Wed 7/8

12:00 pm-4:33 pm

1 stop19h 33m

$1,388

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/13

6:21 am-9:35 am

2 stops36h 14m

Sydney Kingsford Smith

Wed 5/20

12:00 pm-5:21 pm

1 stop20h 21m

$1,397

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 9/23

3:12 pm-7:30 am

2 stops25h 18m

Sydney Kingsford Smith

Wed 10/7

6:50 pm-2:26 pm

2 stops35h 36m

$1,424

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 8/23

3:00 pm-7:30 am

2 stops25h 30m

Sydney Kingsford Smith

Wed 9/2

5:50 pm-5:03 pm

2 stops38h 13m

$1,465

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 5/18

7:06 pm-8:15 am

1 stop22h 09m

Melbourne

Tue 8/11

10:55 am-6:24 pm

1 stop22h 29m

$1,479

Quickest round-trip

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sun 5/10

7:06 pm-8:15 am

1 stop22h 09m

Melbourne

Wed 5/20

10:55 am-6:22 pm

1 stop22h 27m

$1,481

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 8/18

6:02 am-6:35 pm

2 stops47h 33m

Perth

Sun 9/20

10:45 pm-11:59 pm

2 stops38h 14m

$1,522

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 8/18

6:02 am-6:35 pm

2 stops47h 33m

Perth

Sun 9/20

10:45 pm-11:59 pm

2 stops38h 14m

$1,610

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 March is, on average, the cheapest month to fly to Australia from St. Louis, with most prices found around $1,233. If you aren’t able to travel during the month of March, then book flights to Australia from St. Louis during October instead. Flights to Australia in October, while not as cheap as those in March, still average around $1,269.

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 04m
Direct flights	None

The fastest flight from St. Louis to Australia takes 20h 04m

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 April 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
Fiji Airways	PriceFrom $887	Free Cancellation	Rating 8.1 239 reviews	Search Fiji Airways flights
Air Canada	PriceFrom $894	Free Cancellation	Rating 7.1 10,916 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $975	Free Cancellation	Rating 7.5 1,018 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $1,029	Free Cancellation	Rating 7.4 9,579 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,056	Free Cancellation	Rating 7.1 11,567 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.