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 39% 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 and United Airlines 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 January 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.

$551 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.

4:05 pm - 7:45 am

STL

BNE

48h 40m

2 stops

9:45 am - 3:29 pm

BNE

STL

44h 44m

2 stops

$956Air Canada

Sun, Mar 8 - Sun, Mar 15

6:50 pm - 8:50 pm

STL

SYD

34h 00m

2 stops

11:20 am - 11:58 pm

SYD

STL

28h 38m

1 stop

$973Qantas Airways

Mon, Mar 9 - Mon, Mar 16

4:05 pm - 11:30 am

STL

BNE

52h 25m

3 stops

9:45 am - 3:29 pm

BNE

STL

44h 44m

2 stops

$976Multiple Airlines

Sun, Mar 8 - Sun, Mar 15

6:50 pm - 6:45 pm

STL

MEL

30h 55m

2 stops

7:00 am - 7:29 pm

MEL

STL

29h 29m

2 stops

$1,116Multiple Airlines

Thu, Feb 19 - Thu, Feb 26

2:19 pm - 9:30 am

STL

MEL

27h 11m

2 stops

12:00 pm - 11:58 pm

MEL

STL

27h 58m

1 stop

$1,270American Airlines

Thu, Mar 12 - Sat, Mar 21

2:37 pm - 9:30 am

STL

MEL

26h 53m

2 stops

12:00 pm - 9:11 pm

MEL

STL

25h 11m

2 stops

$1,271American Airlines

Tue, Mar 10 - Tue, Mar 17

10:37 am - 6:55 am

STL

PER

30h 18m

2 stops

8:30 am - 5:53 pm

PER

STL

46h 23m

2 stops

$1,457Cathay Pacific

Wed, Feb 25 - Wed, Mar 11

5:00 pm - 6:00 pm

STL

CBR

32h 00m

2 stops

6:30 am - 3:37 pm

CBR

STL

26h 07m

2 stops

$1,628United Airlines

Sat, Feb 7 - Tue, Feb 10

5:00 pm - 6:00 pm

STL

CBR

32h 00m

2 stops

6:30 am - 3:37 pm

CBR

STL

26h 07m

2 stops

$1,629United Airlines

Sat, Feb 7 - Tue, Feb 10

10:37 am - 10:55 pm

STL

PER

46h 18m

2 stops

8:30 am - 5:58 pm

PER

STL

46h 28m

2 stops

$1,769Cathay Pacific

Thu, Mar 5 - Mon, Mar 9

Qantas Airways flights from St. Louis to Australia

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

Qantas Airways

Mar 9

STL6:50 pmLambert-St Louis

34h 00m

2 stops

SYD8:50 pmSydney Kingsford Smith

Mar 16

SYD11:20 amSydney Kingsford Smith

28h 38m

1 stop

STL11:58 pmLambert-St Louis

$973

Qantas Airways

Mar 15

STL4:13 pmLambert-St Louis

36h 37m

2 stops

SYD8:50 pmSydney Kingsford Smith

Mar 24

SYD11:20 amSydney Kingsford Smith

28h 38m

1 stop

STL11:58 pmLambert-St Louis

$975

Qantas Airways

Feb 9

STL5:04 pmLambert-St Louis

31h 36m

2 stops

SYD5:40 pmSydney Kingsford Smith

Feb 16

SYD5:45 pmSydney Kingsford Smith

23h 14m

1 stop

STL11:59 pmLambert-St Louis

$982

Delta flights from St. Louis to Australia

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

Delta

Feb 13

STL2:22 pmLambert-St Louis

25h 58m

2 stops

BNE8:20 amBrisbane

Feb 20

BNE10:40 amBrisbane

28h 43m

2 stops

STL11:23 pmLambert-St Louis

$1,215

Delta

Feb 22

STL11:55 amLambert-St Louis

25h 55m

2 stops

SYD6:50 amSydney Kingsford Smith

Mar 2

SYD10:40 amSydney Kingsford Smith

24h 02m

2 stops

STL5:42 pmLambert-St Louis

$1,281

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 3/8

4:05 pm-7:45 am

2 stops48h 40m

Brisbane

Sun 3/15

9:45 am-3:29 pm

2 stops44h 44m

$956

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 3/9

6:50 pm-8:50 pm

2 stops34h 00m

Sydney Kingsford Smith

Mon 3/16

11:20 am-11:58 pm

1 stop28h 38m

$973

St. LouisBrisbane

STL - BNE

STLBNE

Lambert-St Louis

Sun 3/8

4:05 pm-11:30 am

3 stops52h 25m

Brisbane

Sun 3/15

9:45 am-3:29 pm

2 stops44h 44m

$976

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Thu 2/19

6:50 pm-6:45 pm

2 stops30h 55m

Melbourne

Thu 2/26

7:00 am-7:29 pm

2 stops29h 29m

$1,116

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Thu 3/12

2:19 pm-9:30 am

2 stops27h 11m

Melbourne

Sat 3/21

12:00 pm-11:58 pm

1 stop27h 58m

$1,270

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Tue 3/10

2:37 pm-9:30 am

2 stops26h 53m

Melbourne

Tue 3/17

12:00 pm-9:11 pm

2 stops25h 11m

$1,271

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 2/25

10:37 am-6:55 am

2 stops30h 18m

Perth

Wed 3/11

8:30 am-5:53 pm

2 stops46h 23m

$1,457

St. LouisCanberra

STL - CBR

STLCBR

Lambert-St Louis

Sat 2/7

5:00 pm-6:00 pm

2 stops32h 00m

Canberra

Tue 2/10

6:30 am-3:37 pm

2 stops26h 07m

$1,628

St. LouisCanberra

STL - CBR

STLCBR

Lambert-St Louis

Sat 2/7

5:00 pm-6:00 pm

2 stops32h 00m

Canberra

Tue 2/10

6:30 am-3:37 pm

2 stops26h 07m

$1,629

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 3/5

10:37 am-10:55 pm

2 stops46h 18m

Perth

Mon 3/9

8:30 am-5:58 pm

2 stops46h 28m

$1,769

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 $1,205. If you aren’t able to travel during the month of August, then book flights to Australia from St. Louis during November instead. Flights to Australia in November, while not as cheap as those in August, still average around $1,344.

How far in advance should I book a flight to Australia?

You are more likely to see cheaper flights to Australia from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Australia for around $1,436 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Australia from St. Louis for as low as $948 on momondo.

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	20h 42m
Direct flights	None

The fastest flight from St. Louis to Australia takes 20h 42m

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 January 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 10,655 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $975	Free Cancellation	Rating 7.5 975 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $1,027	Free Cancellation	Rating 7.4 9,198 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,118	Free Cancellation	Rating 7.2 11,197 reviews	Search American Airlines flights
Fiji Airways	PriceFrom $1,132	Free Cancellation	Rating 8.0 222 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.