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

Qantas Airways, Delta, and United Airlines are the most popular carriers operating from Lambert-St Louis to Australia

What airlines fly to Australia?

Qantas Airways, United Airlines and Air Canada are the top three most popular airlines that fly to Australia from St. Louis according to our data. Qantas Airways is the first choice among our users, with 38% of people opting to fly with this airline when traveling to Australia. Keep in mind that there are 4 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 4 operators available for flights from Lambert-St Louis Airport to Australia as of October 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.

$610 Cheap Flights from St. Louis to Australia in 2026/27

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.

3:45 pm - 5:15 pmSTL Lambert-St Louis-MEL Melbourne

32h 30m2 stops Dallas/Fort Worth Auckland Intl

9:45 am - 6:09 pmMEL Melbourne-STL Lambert-St Louis

24h 24m1 stop Dallas/Fort Worth

$957Qantas Airways

Mon, Feb 1 - Wed, Mar 31

6:00 pm - 12:50 pmSTL Lambert-St Louis-BNE Brisbane

26h 50m2 stops Dallas/Fort Worth Auckland Intl

9:40 am - 1:41 pmBNE Brisbane-STL Lambert-St Louis

20h 01m1 stop Dallas/Fort Worth

$972Qantas Airways

Mon, Feb 1 - Sun, Feb 14

1:20 pm - 9:35 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 15m2 stops Denver Intl Vancouver Intl

10:20 am - 9:13 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 53m2 stops Vancouver Intl Chicago O'Hare Intl

$1,120Air Canada

Mon, Mar 8 - Sat, Mar 20

11:14 am - 6:25 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 11m2 stops Chicago O'Hare Intl Los Angeles

11:10 am - 8:17 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 07m2 stops Los Angeles Dallas/Fort Worth

$1,201American Airlines

Tue, Nov 24 - Tue, Dec 1

6:00 am - 6:25 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

31h 25m1 stop Los Angeles

11:10 am - 8:17 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 07m2 stops Los Angeles Dallas/Fort Worth

$1,201American Airlines

Tue, Nov 24 - Tue, Dec 1

8:30 am - 7:30 amSTL Lambert-St Louis-BNE Brisbane

31h 00m1 stop San Francisco

11:20 am - 10:02 pmBNE Brisbane-STL Lambert-St Louis

26h 42m1 stop San Francisco

$1,216United Airlines

Thu, Feb 4 - Sun, Feb 14

8:30 am - 7:30 amSTL Lambert-St Louis-BNE Brisbane

31h 00m1 stop San Francisco

11:20 am - 6:17 pmBNE Brisbane-STL Lambert-St Louis

22h 57m1 stop San Francisco

$1,216United Airlines

Thu, Feb 4 - Thu, Feb 11

12:08 pm - 6:55 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 47m1 stop Dallas/Fort Worth

6:05 am - 1:41 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 36m2 stops Brisbane Dallas/Fort Worth

$1,240Multiple Airlines

Mon, Mar 8 - Sat, Mar 20

8:02 pm - 6:25 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

41h 23m3 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl Los Angeles

6:05 am - 1:41 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 36m2 stops Brisbane Dallas/Fort Worth

$1,244Multiple Airlines

Mon, Mar 8 - Sat, Mar 20

9:05 am - 8:45 amSTL Lambert-St Louis-BNE Brisbane

31h 40m2 stops Chicago O'Hare Intl Vancouver Intl

10:45 am - 3:26 pmBNE Brisbane-STL Lambert-St Louis

44h 41m2 stops Vancouver Intl Toronto Pearson Intl

$1,246Air Canada

Mon, Feb 8 - Fri, Feb 12

Cheap last minute flights

Enter your travel dates to find the best prices.

4:39 pm - 9:05 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 26m2 stops Denver Intl Los Angeles

11:20 am - 6:05 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 45m2 stops Los Angeles San Francisco

$1,338United Airlines

Mon, Nov 2 - Mon, Nov 9

2:55 pm - 9:20 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 25m2 stops Houston George Bush Intcntl San Francisco

9:15 am - 2:13 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 58m1 stop Houston George Bush Intcntl

$1,338United Airlines

Mon, Nov 2 - Mon, Nov 9

6:15 am - 7:00 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

31h 45m1 stop Houston George Bush Intcntl

11:50 am - 10:15 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

27h 25m1 stop San Francisco

$1,338United Airlines

Mon, Nov 2 - Mon, Nov 9

8:15 pm - 10:55 pmSTL Lambert-St Louis-PER Perth

60h 40m2 stops Chicago O'Hare Intl Hong Kong Intl

8:30 am - 4:43 pmPER Perth-STL Lambert-St Louis

46h 13m2 stops Hong Kong Intl Chicago O'Hare Intl

$1,514Cathay Pacific

Sun, Nov 1 - Mon, Nov 16

10:21 am - 10:55 pmSTL Lambert-St Louis-PER Perth

46h 34m2 stops Dallas/Fort Worth Hong Kong Intl

8:30 am - 6:17 pmPER Perth-STL Lambert-St Louis

47h 47m2 stops Hong Kong Intl Chicago O'Hare Intl

$1,544Multiple Airlines

Sun, Nov 1 - Mon, Nov 16

2:54 pm - 10:20 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 26m3 stops Dallas/Fort Worth Los Angeles Brisbane

11:05 am - 8:42 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 37m2 stops Brisbane Los Angeles

$1,555Multiple Airlines

Mon, Nov 2 - Mon, Nov 9

2:54 pm - 4:20 pmSTL Lambert-St Louis-PER Perth

35h 26m2 stops Dallas/Fort Worth Melbourne

2:00 pm - 1:43 pmPER Perth-STL Lambert-St Louis

61h 43m3 stops Melbourne Los Angeles Phoenix Sky Harbor Intl

$1,857Qantas Airways

Sun, Nov 1 - Mon, Nov 16

6:00 am - 9:35 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 35m3 stops Chicago O'Hare Intl Toronto Pearson Intl Vancouver Intl

11:20 am - 9:40 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

27h 20m2 stops Vancouver Intl Chicago O'Hare Intl

$1,897Air Canada

Sun, Nov 1 - Sun, Nov 15

2:54 pm - 2:30 pmSTL Lambert-St Louis-PER Perth

33h 36m2 stops Dallas/Fort Worth Melbourne

11:10 pm - 8:42 pmPER Perth-STL Lambert-St Louis

59h 32m3 stops Brisbane Sydney Kingsford Smith Los Angeles

$2,058Qantas Airways

Sun, Nov 1 - Mon, Nov 16

4:05 pm - 2:30 pmSTL Lambert-St Louis-PER Perth

56h 25m3 stops Toronto Pearson Intl Vancouver Intl Sydney Kingsford Smith

3:15 pm - 3:26 pmPER Perth-STL Lambert-St Louis

62h 11m3 stops Sydney Kingsford Smith Vancouver Intl Toronto Pearson Intl

$2,669Air Canada

Sun, Nov 1 - Mon, Nov 16

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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

Feb 1

STL3:45 pmLambert-St Louis

32h 30m

2 stops

MEL5:15 pmMelbourne

Mar 31

MEL9:45 amMelbourne

24h 24m

1 stop

STL6:09 pmLambert-St Louis

$957

Qantas Airways

Feb 1

STL6:00 pmLambert-St Louis

26h 50m

2 stops

BNE12:50 pmBrisbane

Feb 14

BNE9:40 amBrisbane

20h 01m

1 stop

STL1:41 pmLambert-St Louis

$972

Qantas Airways

Feb 1

STL6:00 pmLambert-St Louis

20h 30m

1 stop

BNE6:30 amBrisbane

Feb 14

BNE6:30 pmBrisbane

35h 11m

2 stops

STL1:41 pmLambert-St Louis

$980

Air New Zealand flights from St. Louis to Australia

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

Air New Zealand

Feb 21

STL6:10 amLambert-St Louis

35h 25m

2 stops

SYD10:35 amSydney Kingsford Smith

Mar 2

SYD11:50 amSydney Kingsford Smith

27h 35m

2 stops

STL10:25 pmLambert-St Louis

$1,281

Air New Zealand

Jan 24

STL5:59 pmLambert-St Louis

47h 36m

2 stops

SYD10:35 amSydney Kingsford Smith

Feb 6

SYD7:25 pmSydney Kingsford Smith

44h 05m

2 stops

STL10:30 pmLambert-St Louis

$1,309

Air New Zealand

Mar 8

STL6:15 amLambert-St Louis

35h 20m

2 stops

SYD10:35 amSydney Kingsford Smith

Mar 20

SYD7:25 pmSydney Kingsford Smith

42h 47m

2 stops

STL10:12 pmLambert-St Louis

$1,314

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Mon 2/1

3:45 pm-5:15 pm

2 stops32h 30m

Melbourne

Wed 3/31

9:45 am-6:09 pm

1 stop24h 24m

$957

Quickest round-trip

St. LouisBrisbane

STL Lambert-St Louis - BNE Brisbane

STLBNE

Lambert-St Louis

Mon 2/1

6:00 pm-12:50 pm

2 stops26h 50m

Brisbane

Sun 2/14

9:40 am-1:41 pm

1 stop20h 01m

$972

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 3/8

1:20 pm-9:35 am

2 stops27h 15m

Sydney Kingsford Smith

Sat 3/20

10:20 am-9:13 pm

2 stops26h 53m

$1,120

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 11/24

11:14 am-6:25 am

2 stops26h 11m

Sydney Kingsford Smith

Tue 12/1

11:10 am-8:17 pm

2 stops26h 07m

$1,201

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 11/24

6:00 am-6:25 am

1 stop31h 25m

Sydney Kingsford Smith

Tue 12/1

11:10 am-8:17 pm

2 stops26h 07m

$1,201

St. LouisBrisbane

STL Lambert-St Louis - BNE Brisbane

STLBNE

Lambert-St Louis

Thu 2/4

8:30 am-7:30 am

1 stop31h 00m

Brisbane

Sun 2/14

11:20 am-10:02 pm

1 stop26h 42m

$1,216

St. LouisBrisbane

STL Lambert-St Louis - BNE Brisbane

STLBNE

Lambert-St Louis

Thu 2/4

8:30 am-7:30 am

1 stop31h 00m

Brisbane

Thu 2/11

11:20 am-6:17 pm

1 stop22h 57m

$1,216

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 3/8

12:08 pm-6:55 am

1 stop25h 47m

Sydney Kingsford Smith

Sat 3/20

6:05 am-1:41 pm

2 stops23h 36m

$1,240

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 3/8

8:02 pm-6:25 am

3 stops41h 23m

Sydney Kingsford Smith

Sat 3/20

6:05 am-1:41 pm

2 stops23h 36m

$1,244

St. LouisBrisbane

STL Lambert-St Louis - BNE Brisbane

STLBNE

Lambert-St Louis

Mon 2/8

9:05 am-8:45 am

2 stops31h 40m

Brisbane

Fri 2/12

10:45 am-3:26 pm

2 stops44h 41m

$1,246

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 $967. If you aren’t able to travel during the month of May, then book flights to Australia from St. Louis during February instead. Flights to Australia in February, while not as cheap as those in May, still average around $1,259.

Can stopping save me money on St. Louis to Australia flights?

You could potentially save up to 15% 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

Best Price Found	$610
Fastest flight time	21h 15m
Direct flights	None

The best one-way flight to Australia from St. Louis in the past 72 hours is $610. The best round-trip flight deal from St. Louis to Australia found on momondo in the last 72 hours is $957.

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

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 4 operators available for flights from Lambert-St Louis Airport to Australia as of October 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 1,122 reviews	Search Qantas Airways flights
Air Canada	PriceFrom $894	Free Cancellation	Rating 7.1 11,834 reviews	Search Air Canada flights
United Airlines	PriceFrom $1,029	Free Cancellation	Rating 7.3 10,460 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,233	Free Cancellation	Rating 7.0 12,222 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.