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

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

What airlines fly to Australia?

Qantas Airways, United Airlines and American Airlines 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 39% 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 September 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.

$606 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.

5:40 am - 5:00 amSTL Lambert-St Louis-MEL Melbourne

31h 20m1 stop Dallas/Fort Worth

10:45 pm - 8:07 amMEL Melbourne-STL Lambert-St Louis

26h 22m2 stops Los Angeles Charlotte Douglas

$1,146American Airlines

Tue, Oct 27 - Wed, Nov 11

11:32 am - 5:00 amSTL Lambert-St Louis-MEL Melbourne

25h 28m2 stops Chicago O'Hare Intl Dallas/Fort Worth

10:45 pm - 8:07 amMEL Melbourne-STL Lambert-St Louis

26h 22m2 stops Los Angeles Charlotte Douglas

$1,146American Airlines

Tue, Oct 27 - Wed, Nov 11

7:20 pm - 8:50 amSTL Lambert-St Louis-MEL Melbourne

45h 30m2 stops Atlanta Hartsfield-Jackson Los Angeles

10:10 am - 9:09 pmMEL Melbourne-STL Lambert-St Louis

27h 59m2 stops Los Angeles Salt Lake City

$1,164Delta

Tue, Oct 20 - Tue, Nov 3

3:12 pm - 7:30 amSTL Lambert-St Louis-MEL Melbourne

25h 18m2 stops Houston George Bush Intcntl Los Angeles

11:55 am - 6:43 pmMEL Melbourne-STL Lambert-St Louis

22h 48m1 stop San Francisco

$1,165United Airlines

Mon, Sep 28 - Mon, Oct 5

12:00 pm - 7:00 amSTL Lambert-St Louis-MEL Melbourne

27h 00m2 stops Atlanta Hartsfield-Jackson Los Angeles

10:10 am - 9:18 pmMEL Melbourne-STL Lambert-St Louis

28h 08m2 stops Los Angeles Salt Lake City

$1,165Delta

Tue, Oct 27 - Wed, Nov 11

11:10 am - 9:15 amSTL Lambert-St Louis-MEL Melbourne

30h 05m2 stops Houston George Bush Intcntl San Francisco

12:45 pm - 6:05 pmMEL Melbourne-STL Lambert-St Louis

22h 20m1 stop San Francisco

$1,169United Airlines

Tue, Oct 20 - Tue, Nov 3

7:01 pm - 9:30 pmSTL Lambert-St Louis-SYD Sydney Kingsford Smith

33h 29m2 stops Dallas/Fort Worth Brisbane

2:05 pm - 6:11 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 06m1 stop Dallas/Fort Worth

$1,312Qantas Airways

Sat, Feb 13 - Sat, Feb 27

10:12 am - 5:00 amSTL Lambert-St Louis-MEL Melbourne

26h 48m1 stop Dallas/Fort Worth

10:45 pm - 8:42 pmMEL Melbourne-STL Lambert-St Louis

38h 57m1 stop Los Angeles

$1,316Qantas Airways

Tue, Oct 27 - Wed, Nov 11

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

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

10:55 pm - 3:26 pmPER Perth-STL Lambert-St Louis

54h 31m3 stops Sydney Kingsford Smith Vancouver Intl Toronto Pearson Intl

$2,065Air Canada

Mon, Nov 9 - Fri, Nov 13

4:05 pm - 7:45 pmSTL Lambert-St Louis-HBA Hobart

58h 40m3 stops Toronto Pearson Intl Vancouver Intl Sydney Kingsford Smith

8:25 pm - 3:26 pmHBA Hobart-STL Lambert-St Louis

60h 01m3 stops Sydney Kingsford Smith Vancouver Intl Toronto Pearson Intl

$3,039Air Canada

Mon, Feb 8 - Fri, Feb 12

Cheap last minute flights

Enter your travel dates to find the best prices.

6:00 am - 8:40 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

35h 40m2 stops Los Angeles Hong Kong Intl

8:55 pm - 12:03 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

30h 08m2 stops Tokyo Haneda Chicago O'Hare Intl

$2,147Multiple Airlines

Wed, Sep 2 - Fri, Sep 4

6:00 am - 7:05 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 05m1 stop Los Angeles

9:10 am - 10:59 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

28h 49m1 stop Los Angeles

$2,326Qantas Airways

Wed, Sep 2 - Fri, Sep 4

8:42 am - 6:55 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

31h 13m1 stop San Francisco

9:55 am - 2:13 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

43h 18m2 stops Auckland Intl Houston George Bush Intcntl

$2,366Air New Zealand

Wed, Sep 2 - Fri, Sep 4

6:00 am - 7:05 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 05m1 stop Los Angeles

6:15 pm - 10:59 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

43h 44m2 stops Melbourne Los Angeles

$2,426Qantas Airways

Wed, Sep 2 - Fri, Sep 4

12:59 pm - 7:20 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 21m2 stops Chicago O'Hare Intl Vancouver Intl

9:20 am - 6:42 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

48h 22m3 stops Vancouver Intl Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl

$4,360Multiple Airlines

Wed, Sep 2 - Fri, Sep 4

12:45 pm - 7:30 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 45m3 stops Dallas/Fort Worth Phoenix Sky Harbor Intl Los Angeles

9:25 pm - 9:24 amSYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 59m3 stops San Francisco Los Angeles Dallas/Fort Worth

$4,631Multiple Airlines

Wed, Sep 2 - Fri, Sep 4

3:32 pm - 6:55 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 23m1 stop Dallas/Fort Worth

9:25 pm - 9:32 amSYD Sydney Kingsford Smith-STL Lambert-St Louis

27h 07m2 stops San Francisco Charlotte Douglas

$25,458Multiple Airlines

Fri, Sep 4 - Sun, Sep 6

6:00 am - 7:05 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 05m1 stop Los Angeles

5:50 pm - 10:59 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

20h 09m1 stop Los Angeles

$28,113Multiple Airlines

Fri, Sep 4 - Sun, Sep 6

3:32 pm - 10:35 amSTL Lambert-St Louis-MEL Melbourne

28h 03m2 stops Dallas/Fort Worth Sydney Kingsford Smith

1:55 pm - 10:59 pmMEL Melbourne-STL Lambert-St Louis

24h 04m2 stops Sydney Kingsford Smith Los Angeles

$28,839Multiple Airlines

Fri, Sep 4 - Sun, Sep 6

4:50 pm - 10:35 amSTL Lambert-St Louis-MEL Melbourne

26h 45m3 stops Chicago O'Hare Intl Dallas/Fort Worth Sydney Kingsford Smith

2:05 pm - 10:59 pmMEL Melbourne-STL Lambert-St Louis

23h 54m2 stops Sydney Kingsford Smith Los Angeles

$29,570Multiple Airlines

Fri, Sep 4 - Sun, Sep 6

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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 13

STL7:01 pmLambert-St Louis

33h 29m

2 stops

SYD9:30 pmSydney Kingsford Smith

Feb 27

SYD2:05 pmSydney Kingsford Smith

21h 06m

1 stop

STL6:11 pmLambert-St Louis

$1,312

Qantas Airways

Oct 27

STL10:12 amLambert-St Louis

26h 48m

1 stop

MEL5:00 amMelbourne

Nov 11

MEL10:45 pmMelbourne

38h 57m

1 stop

STL8:42 pmLambert-St Louis

$1,316

Qantas Airways

Oct 27

STL10:12 amLambert-St Louis

26h 48m

1 stop

MEL5:00 amMelbourne

Nov 11

MEL10:45 pmMelbourne

38h 57m

1 stop

STL8:42 pmLambert-St Louis

$1,321

United Airlines flights from St. Louis to Australia

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

United Airlines

Oct 20

STL11:10 amLambert-St Louis

30h 05m

2 stops

MEL9:15 amMelbourne

Nov 3

MEL12:45 pmMelbourne

22h 20m

1 stop

STL6:05 pmLambert-St Louis

$1,169

United Airlines

Oct 20

STL3:12 pmLambert-St Louis

26h 03m

2 stops

MEL9:15 amMelbourne

Nov 3

MEL12:45 pmMelbourne

22h 20m

1 stop

STL6:05 pmLambert-St Louis

$1,170

United Airlines

Feb 26

STL1:08 pmLambert-St Louis

28h 22m

2 stops

MEL10:30 amMelbourne

Mar 8

MEL12:45 pmMelbourne

22h 08m

1 stop

STL5:53 pmLambert-St Louis

$1,219

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Tue 10/27

5:40 am-5:00 am

1 stop31h 20m

Melbourne

Wed 11/11

10:45 pm-8:07 am

2 stops26h 22m

$1,146

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Tue 10/27

11:32 am-5:00 am

2 stops25h 28m

Melbourne

Wed 11/11

10:45 pm-8:07 am

2 stops26h 22m

$1,146

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Tue 10/20

7:20 pm-8:50 am

2 stops45h 30m

Melbourne

Tue 11/3

10:10 am-9:09 pm

2 stops27h 59m

$1,164

Quickest round-trip

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Mon 9/28

3:12 pm-7:30 am

2 stops25h 18m

Melbourne

Mon 10/5

11:55 am-6:43 pm

1 stop22h 48m

$1,165

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Tue 10/27

12:00 pm-7:00 am

2 stops27h 00m

Melbourne

Wed 11/11

10:10 am-9:18 pm

2 stops28h 08m

$1,165

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Tue 10/20

11:10 am-9:15 am

2 stops30h 05m

Melbourne

Tue 11/3

12:45 pm-6:05 pm

1 stop22h 20m

$1,169

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 2/13

7:01 pm-9:30 pm

2 stops33h 29m

Sydney Kingsford Smith

Sat 2/27

2:05 pm-6:11 pm

1 stop21h 06m

$1,312

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Tue 10/27

10:12 am-5:00 am

1 stop26h 48m

Melbourne

Wed 11/11

10:45 pm-8:42 pm

1 stop38h 57m

$1,316

St. LouisPerth

STL Lambert-St Louis - PER Perth

STLPER

Lambert-St Louis

Mon 11/9

4:05 pm-2:30 pm

3 stops56h 25m

Perth

Fri 11/13

10:55 pm-3:26 pm

3 stops54h 31m

$2,065

St. LouisHobart

STL Lambert-St Louis - HBA Hobart

STLHBA

Lambert-St Louis

Mon 2/8

4:05 pm-7:45 pm

3 stops58h 40m

Hobart

Fri 2/12

8:25 pm-3:26 pm

3 stops60h 01m

$3,039

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 $1,037. 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 $1,262.

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

You could potentially save up to 19% 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	$606
Fastest flight time	20h 24m
Direct flights	None

The best one-way flight to Australia from St. Louis in the past 72 hours is $606. The best round-trip flight deal from St. Louis to Australia found on momondo in the last 72 hours is $1,146.

The fastest flight from St. Louis to Australia takes 20h 24m

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 September 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 1,088 reviews	Search Qantas Airways flights
Air Canada	PriceFrom $894	Free Cancellation	Rating 7.1 11,573 reviews	Search Air Canada flights
United Airlines	PriceFrom $1,029	Free Cancellation	Rating 7.4 10,157 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,086	Free Cancellation	Rating 7.1 12,021 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.