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

United Airlines, Qantas Airways, and American Airlines 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 34% 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 August 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.

$635 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.

10:22 am - 5:00 amSTL Lambert-St Louis-MEL Melbourne

26h 38m2 stops Charlotte Douglas Dallas/Fort Worth

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

26h 22m2 stops Los Angeles Charlotte Douglas

$1,244American Airlines

Tue, Oct 27 - Wed, Nov 11

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

$1,244American Airlines

Tue, Oct 27 - Wed, Nov 11

7:05 pm - 5:15 pmSTL Lambert-St Louis-BNE Brisbane

30h 10m2 stops Dallas/Fort Worth Auckland Intl

9:40 am - 12:28 pmBNE Brisbane-STL Lambert-St Louis

18h 48m1 stop Dallas/Fort Worth

$1,262Multiple Airlines

Sun, Nov 1 - Sun, Nov 8

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

45h 30m2 stops Atlanta Hartsfield-Jackson Los Angeles

12:00 pm - 9:25 pmMEL Melbourne-STL Lambert-St Louis

26h 25m2 stops Los Angeles Minneapolis St Paul

$1,262Delta

Tue, Oct 20 - Tue, Nov 3

2:54 pm - 6:30 amSTL Lambert-St Louis-BNE Brisbane

23h 36m1 stop Dallas/Fort Worth

9:40 am - 6:15 pmBNE Brisbane-STL Lambert-St Louis

24h 35m1 stop Dallas/Fort Worth

$1,265Qantas Airways

Sun, Nov 1 - Sun, Nov 8

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

$1,266United Airlines

Tue, Oct 20 - Tue, Nov 3

1:29 pm - 8:30 amSTL Lambert-St Louis-MEL Melbourne

27h 01m2 stops Chicago O'Hare Intl Los Angeles

11:55 am - 8:36 pmMEL Melbourne-STL Lambert-St Louis

24h 41m2 stops San Francisco Denver Intl

$1,267United Airlines

Wed, Oct 7 - Mon, Oct 19

11:55 am - 5:00 amSTL Lambert-St Louis-MEL Melbourne

24h 05m1 stop Dallas/Fort Worth

8:00 am - 11:56 pmMEL Melbourne-STL Lambert-St Louis

30h 56m2 stops Brisbane Los Angeles

$1,305Qantas Airways

Sun, Jan 31 - Fri, Jun 11

2:40 pm - 11:30 amSTL Lambert-St Louis-BNE Brisbane

29h 50m3 stops Toronto Pearson Intl Vancouver Intl Sydney Kingsford Smith

5:05 am - 8:00 pmBNE Brisbane-STL Lambert-St Louis

29h 55m3 stops Sydney Kingsford Smith Vancouver Intl Toronto Pearson Intl

$1,467Air Canada

Thu, Oct 15 - Wed, Oct 21

2:40 pm - 5:00 pmSTL Lambert-St Louis-PER Perth

37h 20m3 stops Toronto Pearson Intl Vancouver Intl Sydney Kingsford Smith

1:15 pm - 8:20 pmPER Perth-STL Lambert-St Louis

44h 05m3 stops Sydney Kingsford Smith Vancouver Intl Toronto Pearson Intl

$1,699Air Canada

Sat, Sep 12 - Sat, Sep 19

Cheap last minute flights

Enter your travel dates to find the best prices.

7:23 pm - 6:55 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

20h 32m1 stop San Francisco

10:20 am - 11:31 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

28h 11m2 stops San Francisco Denver Intl

$1,230United Airlines

Sun, Aug 9 - Sun, Aug 23

9:15 am - 6:50 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

30h 35m2 stops Atlanta Hartsfield-Jackson Los Angeles

9:15 am - 6:55 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 40m2 stops Los Angeles Salt Lake City

$1,230Delta

Sun, Aug 9 - Sun, Aug 23

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

$1,245American Airlines

Sun, Aug 9 - Sun, Aug 23

12:10 pm - 7:20 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

28h 10m2 stops Montreal Pierre Elliott Trudeau 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

$1,712Air Canada

Sun, Aug 9 - Sun, Aug 23

11:10 am - 11:05 amSTL Lambert-St Louis-BNE Brisbane

32h 55m2 stops Houston George Bush Intcntl Auckland Intl

7:35 pm - 10:27 pmBNE Brisbane-STL Lambert-St Louis

41h 52m2 stops Auckland Intl Houston George Bush Intcntl

$1,876Air New Zealand

Mon, Aug 10 - Wed, Aug 12

2:40 pm - 7:05 amSTL Lambert-St Louis-BNE Brisbane

25h 25m2 stops Toronto Pearson Intl Vancouver Intl

8:40 pm - 8:24 pmBNE Brisbane-STL Lambert-St Louis

38h 44m3 stops Sydney Kingsford Smith Vancouver Intl Toronto Pearson Intl

$1,990Multiple Airlines

Mon, Aug 10 - Wed, Aug 12

6:00 am - 5:00 amSTL Lambert-St Louis-BNE Brisbane

32h 00m1 stop Los Angeles

7:55 am - 4:41 pmBNE Brisbane-STL Lambert-St Louis

23h 46m2 stops Sydney Kingsford Smith Dallas/Fort Worth

$2,270Qantas Airways

Mon, Aug 10 - Wed, Aug 12

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

27h 00m1 stop Dallas/Fort Worth

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

28h 49m1 stop Los Angeles

$9,032Qantas Airways

Mon, Aug 10 - Mon, Aug 24

1:25 pm - 7:05 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 40m2 stops Chicago O'Hare Intl Los Angeles

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

28h 49m1 stop Los Angeles

$9,047Qantas Airways

Mon, Aug 10 - Mon, Aug 24

7:23 pm - 6:30 amSTL Lambert-St Louis-BNE Brisbane

20h 07m1 stop San Francisco

10:30 am - 6:39 pmBNE Brisbane-STL Lambert-St Louis

23h 09m1 stop San Francisco

$11,656United Airlines

Mon, Aug 10 - Wed, Aug 12

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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

Oct 26

STL2:55 pmLambert-St Louis

25h 40m

2 stops

SYD8:35 amSydney Kingsford Smith

Nov 11

SYD7:25 pmSydney Kingsford Smith

44h 00m

2 stops

STL10:25 pmLambert-St Louis

$1,303

Air New Zealand

Aug 10

STL11:10 amLambert-St Louis

32h 55m

2 stops

BNE11:05 amBrisbane

Aug 12

BNE7:35 pmBrisbane

41h 52m

2 stops

STL10:27 pmLambert-St Louis

$1,876

Delta flights from St. Louis to Australia

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

Delta

Aug 9

STL9:15 amLambert-St Louis

30h 35m

2 stops

SYD6:50 amSydney Kingsford Smith

Aug 23

SYD9:15 amSydney Kingsford Smith

24h 40m

2 stops

STL6:55 pmLambert-St Louis

$1,230

Delta

Oct 20

STL7:20 pmLambert-St Louis

45h 30m

2 stops

MEL8:50 amMelbourne

Nov 3

MEL12:00 pmMelbourne

26h 25m

2 stops

STL9:25 pmLambert-St Louis

$1,262

Delta

Oct 5

STL12:00 pmLambert-St Louis

28h 50m

2 stops

MEL8:50 amMelbourne

Oct 18

MEL11:00 amMelbourne

28h 54m

2 stops

STL11:54 pmLambert-St Louis

$1,312

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

10:22 am-5:00 am

2 stops26h 38m

Melbourne

Wed 11/11

10:45 pm-8:07 am

2 stops26h 22m

$1,244

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

$1,244

St. LouisBrisbane

STL Lambert-St Louis - BNE Brisbane

STLBNE

Lambert-St Louis

Sun 11/1

7:05 pm-5:15 pm

2 stops30h 10m

Brisbane

Sun 11/8

9:40 am-12:28 pm

1 stop18h 48m

$1,262

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

12:00 pm-9:25 pm

2 stops26h 25m

$1,262

Quickest round-trip

St. LouisBrisbane

STL Lambert-St Louis - BNE Brisbane

STLBNE

Lambert-St Louis

Sun 11/1

2:54 pm-6:30 am

1 stop23h 36m

Brisbane

Sun 11/8

9:40 am-6:15 pm

1 stop24h 35m

$1,265

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

$1,266

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Wed 10/7

1:29 pm-8:30 am

2 stops27h 01m

Melbourne

Mon 10/19

11:55 am-8:36 pm

2 stops24h 41m

$1,267

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Sun 1/31

11:55 am-5:00 am

1 stop24h 05m

Melbourne

Fri 6/11

8:00 am-11:56 pm

2 stops30h 56m

$1,305

St. LouisBrisbane

STL Lambert-St Louis - BNE Brisbane

STLBNE

Lambert-St Louis

Thu 10/15

2:40 pm-11:30 am

3 stops29h 50m

Brisbane

Wed 10/21

5:05 am-8:00 pm

3 stops29h 55m

$1,467

St. LouisPerth

STL Lambert-St Louis - PER Perth

STLPER

Lambert-St Louis

Sat 9/12

2:40 pm-5:00 pm

3 stops37h 20m

Perth

Sat 9/19

1:15 pm-8:20 pm

3 stops44h 05m

$1,699

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 $992. 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

Fastest flight time	20h 24m
Direct flights	None

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 August 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 1,079 reviews	Search Qantas Airways flights
Air Canada	PriceFrom $894	Free Cancellation	Rating 7.1 11,450 reviews	Search Air Canada flights
United Airlines	PriceFrom $1,029	Free Cancellation	Rating 7.4 10,085 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,056	Free Cancellation	Rating 7.1 11,885 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.