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

United Airlines is the most popular carrier 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 36% 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.

$626 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.

6:30 am - 9:30 am

STL

MEL

35h 00m

1 stop

11:15 pm - 11:42 pm

MEL

STL

41h 27m

1 stop

$1,099Qantas Airways

Tue, Oct 27 - Wed, Nov 11

6:30 am - 9:30 am

STL

MEL

35h 00m

1 stop

11:15 pm - 11:42 pm

MEL

STL

41h 27m

1 stop

$1,130Qantas Airways

Tue, Oct 27 - Wed, Nov 11

6:30 am - 9:30 am

STL

MEL

35h 00m

1 stop

11:15 pm - 11:42 pm

MEL

STL

41h 27m

1 stop

$1,131Qantas Airways

Tue, Oct 27 - Wed, Nov 11

8:42 am - 6:55 am

STL

SYD

31h 13m

1 stop

10:20 am - 6:39 pm

SYD

STL

23h 19m

1 stop

$1,188United Airlines

Wed, Aug 12 - Sun, Aug 30

7:00 am - 6:50 am

STL

SYD

32h 50m

2 stops

9:15 am - 6:55 pm

SYD

STL

24h 40m

2 stops

$1,190Delta

Mon, Aug 10 - Mon, Aug 17

5:10 am - 7:00 am

STL

SYD

34h 50m

2 stops

10:20 am - 4:34 pm

SYD

STL

21h 14m

2 stops

$1,191United Airlines

Sun, Aug 9 - Sun, Aug 16

12:43 pm - 6:45 am

STL

MEL

26h 02m

2 stops

11:15 pm - 8:58 am

MEL

STL

26h 43m

2 stops

$1,194American Airlines

Tue, Oct 20 - Tue, Nov 3

6:00 am - 7:05 am

STL

SYD

34h 05m

1 stop

9:10 am - 6:05 pm

SYD

STL

23h 55m

2 stops

$1,195American Airlines

Mon, Aug 10 - Mon, Aug 17

12:10 pm - 7:05 am

STL

BNE

27h 55m

2 stops

10:00 am - 6:42 pm

BNE

STL

47h 42m

2 stops

$1,399Air Canada

Sun, Aug 9 - Sun, Aug 16

12:10 pm - 7:05 am

STL

BNE

27h 55m

2 stops

10:00 am - 6:42 pm

BNE

STL

47h 42m

2 stops

$1,401Air Canada

Wed, Aug 5 - Wed, Aug 12

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United Airlines flights from St. Louis to Australia

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

United Airlines

Jun 28

STL7:23 pmLambert-St Louis

20h 32m

1 stop

SYD6:55 amSydney Kingsford Smith

Jul 12

SYD10:20 amSydney Kingsford Smith

22h 57m

1 stop

STL6:17 pmLambert-St Louis

$1,177

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

23h 19m

1 stop

STL6:39 pmLambert-St Louis

$1,188

United Airlines

Aug 9

STL5:10 amLambert-St Louis

34h 50m

2 stops

SYD7:00 amSydney Kingsford Smith

Aug 16

SYD10:20 amSydney Kingsford Smith

21h 14m

2 stops

STL4:34 pmLambert-St Louis

$1,191

Air Canada flights from St. Louis to Australia

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

Air Canada

Aug 9

STL12:10 pmLambert-St Louis

27h 55m

2 stops

BNE7:05 amBrisbane

Aug 16

BNE10:00 amBrisbane

47h 42m

2 stops

STL6:42 pmLambert-St Louis

$1,399

Air Canada

Aug 5

STL12:10 pmLambert-St Louis

27h 55m

2 stops

BNE7:05 amBrisbane

Aug 12

BNE10:00 amBrisbane

47h 42m

2 stops

STL6:42 pmLambert-St Louis

$1,401

Air Canada

Sep 26

STL12:10 pmLambert-St Louis

52h 10m

2 stops

SYD7:20 amSydney Kingsford Smith

Sep 30

SYD9:20 amSydney Kingsford Smith

48h 21m

2 stops

STL6:41 pmLambert-St Louis

$1,403

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 10/27

6:30 am-9:30 am

1 stop35h 00m

Melbourne

Wed 11/11

11:15 pm-11:42 pm

1 stop41h 27m

$1,099

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 10/27

6:30 am-9:30 am

1 stop35h 00m

Melbourne

Wed 11/11

11:15 pm-11:42 pm

1 stop41h 27m

$1,130

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 10/27

6:30 am-9:30 am

1 stop35h 00m

Melbourne

Wed 11/11

11:15 pm-11:42 pm

1 stop41h 27m

$1,131

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-6:39 pm

1 stop23h 19m

$1,188

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 8/10

7:00 am-6:50 am

2 stops32h 50m

Sydney Kingsford Smith

Mon 8/17

9:15 am-6:55 pm

2 stops24h 40m

$1,190

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 8/9

5:10 am-7:00 am

2 stops34h 50m

Sydney Kingsford Smith

Sun 8/16

10:20 am-4:34 pm

2 stops21h 14m

$1,191

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

11:15 pm-8:58 am

2 stops26h 43m

$1,194

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 8/10

6:00 am-7:05 am

1 stop34h 05m

Sydney Kingsford Smith

Mon 8/17

9:10 am-6:05 pm

2 stops23h 55m

$1,195

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 8/9

12:10 pm-7:05 am

2 stops27h 55m

Brisbane

Sun 8/16

10:00 am-6:42 pm

2 stops47h 42m

$1,399

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Wed 8/5

12:10 pm-7:05 am

2 stops27h 55m

Brisbane

Wed 8/12

10:00 am-6:42 pm

2 stops47h 42m

$1,401

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
Air Canada	PriceFrom $894	Free Cancellation	Rating 7.1 11,267 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $998	Free Cancellation	Rating 7.5 1,050 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $1,029	Free Cancellation	Rating 7.4 9,898 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,056	Free Cancellation	Rating 7.1 11,776 reviews	Search American Airlines flights
Fiji Airways	PriceFrom $1,265	Free Cancellation	Rating 8.1 245 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.