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 42% 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 December 2025.

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.

$672 Cheap Flights from St. Louis to Australia in 2025/26

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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.

7:04 am - 7:35 am

STL

SYD

55h 31m2 stops

5:45 pm - 11:59 pm

SYD

STL

23h 14m1 stop

$992Qantas Airways

Sun, Jan 25 - Sun, Feb 1

3:31 pm - 8:50 pm

STL

SYD

36h 19m2 stops

9:10 am - 11:16 pm

SYD

STL

29h 06m1 stop

$1,006Qantas Airways

Mon, Feb 23 - Thu, Apr 9

4:30 pm - 9:35 am

STL

SYD

24h 05m2 stops

9:20 am - 3:24 pm

SYD

STL

45h 04m2 stops

$1,071Multiple Airlines

Mon, Feb 23 - Thu, Apr 9

7:04 am - 1:00 pm

STL

SYD

36h 56m2 stops

2:05 pm - 4:14 pm

SYD

STL

19h 09m1 stop

$1,103Qantas Airways

Fri, Feb 6 - Tue, Feb 10

6:00 pm - 9:35 am

STL

SYD

46h 35m2 stops

11:20 am - 8:58 pm

SYD

STL

26h 38m2 stops

$1,120Air Canada

Fri, Feb 6 - Tue, Feb 10

6:00 pm - 9:35 am

STL

SYD

46h 35m2 stops

11:20 am - 8:58 pm

SYD

STL

26h 38m2 stops

$1,121Air Canada

Fri, Feb 6 - Tue, Feb 10

10:07 am - 6:00 am

STL

MEL

27h 53m2 stops

9:45 am - 7:03 pm

MEL

STL

24h 18m2 stops

$1,188American Airlines

Fri, Apr 3 - Sun, Apr 19

6:30 am - 9:30 am

STL

MEL

34h 00m2 stops

1:00 pm - 1:16 pm

MEL

STL

41h 16m2 stops

$1,279United Airlines

Wed, Dec 31 - Wed, Jan 14

8:05 am - 9:30 am

STL

MEL

32h 25m2 stops

11:30 am - 4:55 pm

MEL

STL

22h 25m2 stops

$1,291United Airlines

Fri, Jan 2 - Thu, Jan 22

11:41 am - 5:00 am

STL

MEL

24h 19m1 stop

4:05 pm - 10:59 pm

MEL

STL

23h 54m1 stop

$1,413Multiple Airlines

Fri, Jan 2 - Thu, Jan 22

Qantas Airways flights from St. Louis to Australia

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

Qantas Airways

Jan 25

STL7:04 amLambert-St Louis

55h 31m

2 stops

SYD7:35 amSydney Kingsford Smith

Feb 1

SYD5:45 pmSydney Kingsford Smith

23h 14m

1 stop

STL11:59 pmLambert-St Louis

$992

Find similar

Qantas Airways

Feb 23

STL3:31 pmLambert-St Louis

36h 19m

2 stops

SYD8:50 pmSydney Kingsford Smith

Apr 9

SYD9:10 amSydney Kingsford Smith

29h 06m

1 stop

STL11:16 pmLambert-St Louis

$1,006

Find similar

Qantas Airways

Feb 6

STL7:04 amLambert-St Louis

36h 56m

2 stops

SYD1:00 pmSydney Kingsford Smith

Feb 10

SYD2:05 pmSydney Kingsford Smith

19h 09m

1 stop

STL4:14 pmLambert-St Louis

$1,103

Find similar

Air Canada flights from St. Louis to Australia

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

Air Canada

Feb 6

STL6:00 pmLambert-St Louis

46h 35m

2 stops

SYD9:35 amSydney Kingsford Smith

Feb 10

SYD11:20 amSydney Kingsford Smith

26h 38m

2 stops

STL8:58 pmLambert-St Louis

$1,120

Find similar

Air Canada

Feb 6

STL6:00 pmLambert-St Louis

46h 35m

2 stops

SYD9:35 amSydney Kingsford Smith

Feb 10

SYD11:20 amSydney Kingsford Smith

26h 38m

2 stops

STL8:58 pmLambert-St Louis

$1,121

Find similar

Air Canada

Jan 25

STL6:00 pmLambert-St Louis

46h 35m

2 stops

SYD9:35 amSydney Kingsford Smith

Feb 1

SYD11:20 amSydney Kingsford Smith

50h 38m

2 stops

STL8:58 pmLambert-St Louis

$1,129

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/25

7:04 am-7:35 am

2 stops55h 31m

Sydney Kingsford Smith

Sun 2/1

5:45 pm-11:59 pm

1 stop23h 14m

$992

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 2/23

3:31 pm-8:50 pm

2 stops36h 19m

Sydney Kingsford Smith

Thu 4/9

9:10 am-11:16 pm

1 stop29h 06m

$1,006

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 2/23

4:30 pm-9:35 am

2 stops24h 05m

Sydney Kingsford Smith

Thu 4/9

9:20 am-3:24 pm

2 stops45h 04m

$1,071

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 2/6

7:04 am-1:00 pm

2 stops36h 56m

Sydney Kingsford Smith

Tue 2/10

2:05 pm-4:14 pm

1 stop19h 09m

$1,103

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 2/6

6:00 pm-9:35 am

2 stops46h 35m

Sydney Kingsford Smith

Tue 2/10

11:20 am-8:58 pm

2 stops26h 38m

$1,120

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 2/6

6:00 pm-9:35 am

2 stops46h 35m

Sydney Kingsford Smith

Tue 2/10

11:20 am-8:58 pm

2 stops26h 38m

$1,121

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Fri 4/3

10:07 am-6:00 am

2 stops27h 53m

Melbourne

Sun 4/19

9:45 am-7:03 pm

2 stops24h 18m

$1,188

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Wed 12/31

6:30 am-9:30 am

2 stops34h 00m

Melbourne

Wed 1/14

1:00 pm-1:16 pm

2 stops41h 16m

$1,279

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Fri 1/2

8:05 am-9:30 am

2 stops32h 25m

Melbourne

Thu 1/22

11:30 am-4:55 pm

2 stops22h 25m

$1,291

St. LouisMelbourne

STL - MEL

STLMEL

Lambert-St Louis

Fri 1/2

11:41 am-5:00 am

1 stop24h 19m

Melbourne

Thu 1/22

4:05 pm-10:59 pm

1 stop23h 54m

$1,413

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 October instead. Flights to Australia in October, while not as cheap as those in August, still average around $1,331.

What is the cheapest day to depart on your flight to Australia?

The cheapest day to depart from St. Louis to Australia is on a Wednesday. Travelers who choose to depart for Australia on a Wednesday will often find tickets for as low as $1,392. On the other hand, Saturday is the most expensive day to depart from St. Louis because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $1,518.

What is the cheapest time of day to depart on your flight to Australia?

Flying to Australia from St. Louis in the evening is the least expensive time of day to depart. momondo users have found prices as low as $1,440 when looking at flights departing in the evening. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,882 on average. Flights to Australia from St. Louis at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

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 $1,454 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	21h 15m
Direct flights	None

The fastest flight from St. Louis to Australia takes 21h 15m

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 December 2025.
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 $897	Free Cancellation	Rating 7.1 10,516 reviews	Search Air Canada flights
Qantas Airways	PriceFrom $975	Free Cancellation	Rating 7.5 947 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $1,027	Free Cancellation	Rating 7.4 9,095 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,118	Free Cancellation	Rating 7.2 11,050 reviews	Search American Airlines flights
Fiji Airways	PriceFrom $1,132	Free Cancellation	Rating 8.1 210 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.