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

United Airlines, Air New Zealand, and Singapore Airlines 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 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.

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 June 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.

$625 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.

7:00 am - 9:00 am

STL

SYD

33h 00m

1 stop

5:50 pm - 12:37 pm

SYD

STL

35h 47m

2 stops

$1,042Qantas Airways

Mon, Nov 16 - Sat, Nov 21

6:13 pm - 8:50 pm

STL

SYD

33h 37m

2 stops

11:15 am - 11:42 pm

SYD

STL

29h 27m

1 stop

$1,076Qantas Airways

Sun, Nov 15 - Wed, Nov 25

12:43 pm - 6:45 am

STL

MEL

26h 02m

2 stops

11:15 pm - 8:58 am

MEL

STL

26h 43m

2 stops

$1,084American Airlines

Tue, Oct 20 - Tue, Nov 3

12:43 pm - 6:45 am

STL

MEL

26h 02m

2 stops

12:00 pm - 7:30 pm

MEL

STL

24h 30m

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 - 10:29 pm

MEL

STL

27h 29m

1 stop

$1,088American Airlines

Tue, Oct 20 - Tue, Nov 3

9:00 am - 8:15 am

STL

MEL

32h 15m

2 stops

10:55 am - 6:39 pm

MEL

STL

22h 44m

1 stop

$1,095United Airlines

Sun, Aug 16 - Sun, Aug 23

11:51 am - 8:50 am

STL

MEL

28h 59m

2 stops

12:00 pm - 6:56 pm

MEL

STL

23h 56m

2 stops

$1,103Delta

Sat, Oct 24 - Tue, Nov 10

12:10 pm - 7:05 am

STL

BNE

27h 55m

2 stops

10:00 am - 2:02 pm

BNE

STL

43h 02m

2 stops

$1,416Air Canada

Mon, Aug 3 - Mon, Aug 31

12:10 pm - 7:05 am

STL

BNE

27h 55m

2 stops

10:00 am - 2:02 pm

BNE

STL

43h 02m

2 stops

$1,418Air Canada

Mon, Aug 3 - Mon, Aug 31

7:23 pm - 2:40 pm

STL

PER

30h 17m

2 stops

11:45 pm - 6:17 pm

PER

STL

31h 32m

2 stops

$1,821United Airlines

Thu, Jul 23 - Thu, Jul 30

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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

Nov 15

STL6:13 pmLambert-St Louis

33h 37m

2 stops

SYD8:50 pmSydney Kingsford Smith

Nov 25

SYD11:15 amSydney Kingsford Smith

29h 27m

1 stop

STL11:42 pmLambert-St Louis

$1,041

Qantas Airways

Nov 16

STL7:00 amLambert-St Louis

33h 00m

1 stop

SYD9:00 amSydney Kingsford Smith

Nov 21

SYD5:50 pmSydney Kingsford Smith

35h 47m

2 stops

STL12:37 pmLambert-St Louis

$1,042

Qantas Airways

Nov 15

STL6:13 pmLambert-St Louis

33h 37m

2 stops

SYD8:50 pmSydney Kingsford Smith

Nov 25

SYD11:15 amSydney Kingsford Smith

29h 27m

1 stop

STL11:42 pmLambert-St Louis

$1,076

Air Canada flights from St. Louis to Australia

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

Air Canada

Sep 23

STL5:10 amLambert-St Louis

35h 10m

2 stops

SYD7:20 amSydney Kingsford Smith

Oct 7

SYD10:20 amSydney Kingsford Smith

41h 53m

3 stops

STL12:13 pmLambert-St Louis

$1,405

Air Canada

Oct 13

STL4:39 pmLambert-St Louis

23h 41m

2 stops

SYD8:20 amSydney Kingsford Smith

Nov 13

SYD11:20 amSydney Kingsford Smith

42h 00m

3 stops

STL12:20 pmLambert-St Louis

$1,406

Air Canada

Oct 13

STL9:00 amLambert-St Louis

31h 20m

2 stops

SYD8:20 amSydney Kingsford Smith

Nov 13

SYD11:20 amSydney Kingsford Smith

42h 00m

3 stops

STL12:20 pmLambert-St Louis

$1,407

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 11/16

7:00 am-9:00 am

1 stop33h 00m

Sydney Kingsford Smith

Sat 11/21

5:50 pm-12:37 pm

2 stops35h 47m

$1,042

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 11/15

6:13 pm-8:50 pm

2 stops33h 37m

Sydney Kingsford Smith

Wed 11/25

11:15 am-11:42 pm

1 stop29h 27m

$1,076

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 10/20

12:43 pm-6:45 am

2 stops26h 02m

Melbourne

Tue 11/3

11:15 pm-8:58 am

2 stops26h 43m

$1,084

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-7:30 pm

1 stop24h 30m

$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-10:29 pm

1 stop27h 29m

$1,088

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sun 8/16

9:00 am-8:15 am

2 stops32h 15m

Melbourne

Sun 8/23

10:55 am-6:39 pm

1 stop22h 44m

$1,095

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sat 10/24

11:51 am-8:50 am

2 stops28h 59m

Melbourne

Tue 11/10

12:00 pm-6:56 pm

2 stops23h 56m

$1,103

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 8/3

12:10 pm-7:05 am

2 stops27h 55m

Brisbane

Mon 8/31

10:00 am-2:02 pm

2 stops43h 02m

$1,416

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Mon 8/3

12:10 pm-7:05 am

2 stops27h 55m

Brisbane

Mon 8/31

10:00 am-2:02 pm

2 stops43h 02m

$1,418

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 7/23

7:23 pm-2:40 pm

2 stops30h 17m

Perth

Thu 7/30

11:45 pm-6:17 pm

2 stops31h 32m

$1,821

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	21h 52m
Direct flights	None

The fastest flight from St. Louis to Australia takes 21h 52m

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 June 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 1,046 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 11,172 reviews	Search Air Canada flights
United Airlines	PriceFrom $1,029	Free Cancellation	Rating 7.4 9,813 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,056	Free Cancellation	Rating 7.1 11,647 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.