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

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

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.

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.

$491 Cheap Flights from St. Louis to Australia in 2026

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

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.

4:13 pm - 8:50 pm

STL

SYD

35h 37m

2 stops

11:20 am - 11:58 pm

SYD

STL

28h 38m

1 stop

$898Qantas Airways

Tue, Mar 3 - Tue, Mar 10

4:13 pm - 8:50 pm

STL

SYD

36h 37m

2 stops

11:20 am - 11:58 pm

SYD

STL

28h 38m

1 stop

$899Qantas Airways

Thu, Mar 19 - Wed, Mar 25

4:05 pm - 7:45 am

STL

BNE

48h 40m

2 stops

10:00 am - 4:56 pm

BNE

STL

21h 56m

2 stops

$961Multiple Airlines

Sun, Mar 22 - Wed, Apr 29

1:00 pm - 7:05 am

STL

BNE

51h 05m

2 stops

10:00 am - 8:05 pm

BNE

STL

25h 05m

2 stops

$971Air Canada

Sat, May 23 - Tue, Jun 9

4:05 pm - 1:30 pm

STL

BNE

54h 25m

3 stops

10:00 am - 4:56 pm

BNE

STL

21h 56m

2 stops

$995Multiple Airlines

Sun, Mar 22 - Wed, Apr 29

4:05 pm - 8:45 am

STL

BNE

48h 40m

2 stops

10:45 am - 3:29 pm

BNE

STL

43h 44m

2 stops

$1,036Air Canada

Mon, Mar 2 - Mon, Mar 9

4:13 pm - 5:00 am

STL

MEL

20h 47m

1 stop

12:00 pm - 11:58 pm

MEL

STL

27h 58m

1 stop

$1,270American Airlines

Mon, Mar 9 - Fri, Mar 20

4:13 pm - 9:30 am

STL

MEL

25h 17m

2 stops

12:00 pm - 11:58 pm

MEL

STL

27h 58m

1 stop

$1,273American 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

6:51 am - 11:40 am

STL

CBR

36h 49m

2 stops

8:10 am - 5:50 am

CBR

STL

37h 40m

2 stops

$2,180United Airlines

Fri, Mar 27 - Fri, Apr 3

American Airlines flights from St. Louis to Australia

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

American Airlines

Jun 25

STL7:20 pmLambert-St Louis

24h 35m

2 stops

BNE10:55 amBrisbane

Jul 5

BNE7:40 amBrisbane

23h 53m

2 stops

STL4:33 pmLambert-St Louis

$1,259

American Airlines

Mar 4

STL6:38 amLambert-St Louis

33h 22m

1 stop

SYD9:00 amSydney Kingsford Smith

Mar 10

SYD11:20 amSydney Kingsford Smith

28h 38m

1 stop

STL11:58 pmLambert-St Louis

$1,263

American Airlines

Feb 25

STL7:00 amLambert-St Louis

30h 55m

1 stop

SYD6:55 amSydney Kingsford Smith

Mar 2

SYD2:05 pmSydney Kingsford Smith

20h 08m

1 stop

STL5:13 pmLambert-St Louis

$1,264

Air Canada flights from St. Louis to Australia

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

Air Canada

May 23

STL1:00 pmLambert-St Louis

51h 05m

2 stops

BNE7:05 amBrisbane

Jun 9

BNE10:00 amBrisbane

25h 05m

2 stops

STL8:05 pmLambert-St Louis

$971

Air Canada

Mar 2

STL4:05 pmLambert-St Louis

48h 40m

2 stops

BNE8:45 amBrisbane

Mar 9

BNE10:45 amBrisbane

43h 44m

2 stops

STL3:29 pmLambert-St Louis

$1,036

Air Canada

May 23

STL7:30 amLambert-St Louis

37h 00m

3 stops

BNE11:30 amBrisbane

Jun 9

BNE10:00 amBrisbane

25h 05m

2 stops

STL8:05 pmLambert-St Louis

$1,043

Fly from

Fly to

Route

Depart

Return

Price

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

$898

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 3/19

4:13 pm-8:50 pm

2 stops36h 37m

Sydney Kingsford Smith

Wed 3/25

11:20 am-11:58 pm

1 stop28h 38m

$899

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 3/22

4:05 pm-7:45 am

2 stops48h 40m

Brisbane

Wed 4/29

10:00 am-4:56 pm

2 stops21h 56m

$961

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

$971

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 3/22

4:05 pm-1:30 pm

3 stops54h 25m

Brisbane

Wed 4/29

10:00 am-4:56 pm

2 stops21h 56m

$995

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 3/2

4:05 pm-8:45 am

2 stops48h 40m

Brisbane

Mon 3/9

10:45 am-3:29 pm

2 stops43h 44m

$1,036

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 3/9

4:13 pm-5:00 am

1 stop20h 47m

Melbourne

Fri 3/20

12:00 pm-11:58 pm

1 stop27h 58m

$1,270

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

$1,273

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. LouisCanberra

STL - CBR

STLCBR

Lambert-St Louis

Fri 3/27

6:51 am-11:40 am

2 stops36h 49m

Canberra

Fri 4/3

8:10 am-5:50 am

2 stops37h 40m

$2,180

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 $1,275. If you aren’t able to travel during the month of August, then book flights to Australia from St. Louis during March instead. Flights to Australia in March, while not as cheap as those in August, still average around $1,299.

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	19h 40m
Direct flights	None

The fastest flight from St. Louis to Australia takes 19h 40m

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 10,717 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $975	Free Cancellation	Rating 7.5 989 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $1,027	Free Cancellation	Rating 7.4 9,285 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,078	Free Cancellation	Rating 7.2 11,277 reviews	Search American Airlines flights
Fiji Airways	PriceFrom $1,132	Free Cancellation	Rating 8.0 225 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.