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

Air Canada, Qantas Airways, and United 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 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 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.

$506 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.

7:03 am - 5:00 am

STL

MEL

30h 57m

1 stop

9:45 am - 11:56 pm

MEL

STL

29h 11m

1 stop

$1,266American Airlines

Mon, Jun 8 - Mon, Jun 15

1:19 pm - 6:45 am

STL

MEL

26h 26m

2 stops

9:45 am - 11:56 pm

MEL

STL

29h 11m

1 stop

$1,271American Airlines

Mon, Jun 8 - Mon, Jun 15

3:10 pm - 7:30 am

STL

MEL

25h 20m

2 stops

9:30 am - 8:43 pm

MEL

STL

26h 13m

2 stops

$1,282United Airlines

Wed, Jun 10 - Wed, Jun 17

6:30 am - 6:45 am

STL

MEL

32h 15m

1 stop

1:55 pm - 12:37 pm

MEL

STL

39h 42m

2 stops

$1,286Qantas Airways

Thu, Oct 15 - Thu, Nov 5

6:30 am - 9:00 am

STL

SYD

34h 30m

1 stop

5:50 pm - 12:37 pm

SYD

STL

35h 47m

2 stops

$1,287Qantas Airways

Sat, Oct 24 - Mon, Nov 2

7:23 pm - 8:15 am

STL

MEL

21h 52m

1 stop

10:00 am - 6:17 pm

MEL

STL

47h 17m

2 stops

$1,298United Airlines

Sun, Jun 7 - Sat, Jun 13

6:51 pm - 7:20 pm

STL

MEL

33h 29m

2 stops

7:30 am - 10:00 pm

MEL

STL

30h 30m

2 stops

$1,302Multiple Airlines

Sat, Sep 26 - Sat, Oct 10

1:05 pm - 7:20 am

STL

SYD

51h 15m

3 stops

9:20 am - 12:06 pm

SYD

STL

41h 46m

2 stops

$1,395Air Canada

Tue, Jun 9 - Tue, Jun 16

12:10 pm - 7:05 am

STL

BNE

27h 55m

2 stops

10:45 am - 4:30 pm

BNE

STL

44h 45m

2 stops

$1,423Air Canada

Sun, Oct 18 - Sun, Nov 1

1:36 pm - 7:05 am

STL

BNE

26h 29m

2 stops

10:00 am - 6:41 pm

BNE

STL

47h 41m

2 stops

$1,429Multiple Airlines

Fri, Sep 25 - Tue, Oct 6

Air Canada flights from St. Louis to Australia

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

Air Canada

Jun 9

STL1:05 pmLambert-St Louis

51h 15m

3 stops

SYD7:20 amSydney Kingsford Smith

Jun 16

SYD9:20 amSydney Kingsford Smith

41h 46m

2 stops

STL12:06 pmLambert-St Louis

$1,395

Air Canada

Oct 15

STL12:10 pmLambert-St Louis

52h 10m

2 stops

SYD8:20 amSydney Kingsford Smith

Oct 22

SYD10:20 amSydney Kingsford Smith

48h 21m

2 stops

STL6:41 pmLambert-St Louis

$1,420

Air Canada

May 8

STL2:35 pmLambert-St Louis

25h 45m

2 stops

SYD7:20 amSydney Kingsford Smith

May 22

SYD9:20 amSydney Kingsford Smith

29h 37m

2 stops

STL11:57 pmLambert-St Louis

$1,421

Qantas Airways flights from St. Louis to Australia

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

Qantas Airways

Oct 15

STL6:30 amLambert-St Louis

32h 15m

1 stop

MEL6:45 amMelbourne

Nov 5

MEL1:55 pmMelbourne

39h 42m

2 stops

STL12:37 pmLambert-St Louis

$1,286

Qantas Airways

Oct 24

STL6:30 amLambert-St Louis

34h 30m

1 stop

SYD9:00 amSydney Kingsford Smith

Nov 2

SYD5:50 pmSydney Kingsford Smith

35h 47m

2 stops

STL12:37 pmLambert-St Louis

$1,287

Qantas Airways

Jun 6

STL2:58 pmLambert-St Louis

28h 22m

2 stops

BNE10:20 amBrisbane

Jun 13

BNE7:40 amBrisbane

25h 49m

2 stops

STL6:29 pmLambert-St Louis

$1,316

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 6/8

7:03 am-5:00 am

1 stop30h 57m

Melbourne

Mon 6/15

9:45 am-11:56 pm

1 stop29h 11m

$1,266

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Mon 6/8

1:19 pm-6:45 am

2 stops26h 26m

Melbourne

Mon 6/15

9:45 am-11:56 pm

1 stop29h 11m

$1,271

Quickest round-trip

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Wed 6/10

3:10 pm-7:30 am

2 stops25h 20m

Melbourne

Wed 6/17

9:30 am-8:43 pm

2 stops26h 13m

$1,282

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Thu 10/15

6:30 am-6:45 am

1 stop32h 15m

Melbourne

Thu 11/5

1:55 pm-12:37 pm

2 stops39h 42m

$1,286

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 10/24

6:30 am-9:00 am

1 stop34h 30m

Sydney Kingsford Smith

Mon 11/2

5:50 pm-12:37 pm

2 stops35h 47m

$1,287

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sun 6/7

7:23 pm-8:15 am

1 stop21h 52m

Melbourne

Sat 6/13

10:00 am-6:17 pm

2 stops47h 17m

$1,298

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Sat 9/26

6:51 pm-7:20 pm

2 stops33h 29m

Melbourne

Sat 10/10

7:30 am-10:00 pm

2 stops30h 30m

$1,302

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 6/9

1:05 pm-7:20 am

3 stops51h 15m

Sydney Kingsford Smith

Tue 6/16

9:20 am-12:06 pm

2 stops41h 46m

$1,395

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 10/18

12:10 pm-7:05 am

2 stops27h 55m

Brisbane

Sun 11/1

10:45 am-4:30 pm

2 stops44h 45m

$1,423

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Fri 9/25

1:36 pm-7:05 am

2 stops26h 29m

Brisbane

Tue 10/6

10:00 am-6:41 pm

2 stops47h 41m

$1,429

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 49m
Direct flights	None

The fastest flight from St. Louis to Australia takes 20h 49m

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 8.1 240 reviews	Search Fiji Airways flights
Air Canada	PriceFrom $894	Free Cancellation	Rating 7.1 10,977 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $998	Free Cancellation	Rating 7.5 1,028 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $1,029	Free Cancellation	Rating 7.4 9,678 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,056	Free Cancellation	Rating 7.1 11,678 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.