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

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

What airlines fly to Australia?

United Airlines, Qantas Airways and Air Canada 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 37% 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.

$734 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.

5:55 pm - 7:00 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

21h 05m1 stop Houston George Bush Intcntl

11:50 am - 4:57 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

22h 07m2 stops San Francisco Denver Intl

$1,218Lufthansa

Sun, Oct 25 - Mon, Nov 9

5:55 pm - 7:00 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

21h 05m1 stop Houston George Bush Intcntl

11:50 am - 6:05 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 15m1 stop San Francisco

$1,218Lufthansa

Sun, Oct 25 - Mon, Nov 9

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

$1,224American 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

$1,224American Airlines

Tue, Oct 27 - Wed, Nov 11

3:15 pm - 9:20 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 05m2 stops Chicago O'Hare Intl San Francisco

11:50 am - 6:09 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 19m2 stops San Francisco Chicago O'Hare Intl

$1,228United Airlines

Sun, Oct 25 - Mon, Nov 9

7:05 pm - 9:20 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

21h 15m1 stop San Francisco

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

23h 45m2 stops Los Angeles San Francisco

$1,237United Airlines

Sun, Nov 1 - Mon, Nov 9

2:48 pm - 5:15 pmSTL Lambert-St Louis-MEL Melbourne

33h 27m2 stops Dallas/Fort Worth Auckland Intl

10:45 pm - 11:36 pmMEL Melbourne-STL Lambert-St Louis

41h 51m1 stop Los Angeles

$1,265Qantas Airways

Mon, Nov 30 - Mon, Jan 25

2:48 pm - 5:15 pmSTL Lambert-St Louis-MEL Melbourne

33h 27m2 stops Dallas/Fort Worth Auckland Intl

10:45 pm - 11:36 pmMEL Melbourne-STL Lambert-St Louis

41h 51m1 stop Los Angeles

$1,266Qantas Airways

Mon, Nov 30 - Mon, Jan 25

3:00 pm - 8:45 amSTL Lambert-St Louis-BNE Brisbane

25h 45m2 stops Denver Intl Vancouver Intl

10:45 am - 4:26 pmBNE Brisbane-STL Lambert-St Louis

21h 41m2 stops Vancouver Intl Denver Intl

$1,549Air Canada

Wed, Jan 13 - Sat, Jan 30

3:00 pm - 8:45 amSTL Lambert-St Louis-BNE Brisbane

25h 45m2 stops Denver Intl Vancouver Intl

10:45 am - 7:23 pmBNE Brisbane-STL Lambert-St Louis

24h 38m2 stops Vancouver Intl Chicago O'Hare Intl

$1,549Air Canada

Wed, Jan 13 - Sun, Jan 31

Cheap last minute flights

Enter your travel dates to find the best prices.

7:27 am - 8:45 pmSTL Lambert-St Louis-SYD Sydney Kingsford Smith

45h 18m2 stops Chicago O'Hare Intl Hong Kong Intl

10:20 pm - 12:19 amSYD Sydney Kingsford Smith-STL Lambert-St Louis

41h 59m2 stops Hong Kong Intl Chicago O'Hare Intl

$1,682Multiple Airlines

Sun, Oct 4 - Sun, Oct 11

4:42 pm - 10:40 pmSTL Lambert-St Louis-PER Perth

40h 58m3 stops Seattle/Tacoma Intl Vancouver Intl Hong Kong Intl

12:10 am - 11:59 pmPER Perth-STL Lambert-St Louis

36h 49m2 stops Hong Kong Intl Seattle/Tacoma Intl

$1,745Multiple Airlines

Mon, Oct 5 - Sun, Oct 18

7:08 am - 7:55 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 47m1 stop San Francisco

8:55 pm - 8:16 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

39h 21m2 stops Auckland Intl Houston George Bush Intcntl

$1,775Air New Zealand

Sun, Oct 4 - Tue, Oct 6

1:06 pm - 6:50 amSTL Lambert-St Louis-PER Perth

28h 44m2 stops Chicago O'Hare Intl Hong Kong Intl

8:20 am - 11:59 pmPER Perth-STL Lambert-St Louis

52h 39m2 stops Hong Kong Intl Seattle/Tacoma Intl

$1,922Cathay Pacific

Mon, Oct 5 - Mon, Oct 19

8:35 am - 8:00 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

55h 25m2 stops Houston George Bush Intcntl Los Angeles

11:20 am - 6:43 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 23m1 stop San Francisco

$2,347United Airlines

Sun, Oct 4 - Sun, Oct 11

6:04 am - 8:05 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 01m1 stop Los Angeles

1:00 pm - 6:20 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 20m1 stop Dallas/Fort Worth

$2,377Qantas Airways

Mon, Oct 5 - Wed, Oct 7

6:04 am - 8:05 amSTL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 01m1 stop Los Angeles

6:50 pm - 11:46 pmSYD Sydney Kingsford Smith-STL Lambert-St Louis

20h 56m1 stop Los Angeles

$2,425Qantas Airways

Wed, Oct 7 - Fri, Oct 9

6:04 am - 11:55 pmSTL Lambert-St Louis-PER Perth

52h 51m2 stops Los Angeles Brisbane

4:55 pm - 11:59 pmPER Perth-STL Lambert-St Louis

44h 04m2 stops Brisbane Los Angeles

$2,439Qantas Airways

Mon, Oct 5 - Sun, Mar 28

7:08 am - 2:40 pmSTL Lambert-St Louis-PER Perth

42h 32m2 stops San Francisco Melbourne

12:15 pm - 10:09 pmPER Perth-STL Lambert-St Louis

46h 54m2 stops Sydney Kingsford Smith San Francisco

$2,654United Airlines

Mon, Oct 5 - Sat, Apr 3

7:08 am - 3:30 pmSTL Lambert-St Louis-PER Perth

43h 22m2 stops San Francisco Sydney Kingsford Smith

12:15 pm - 10:09 pmPER Perth-STL Lambert-St Louis

46h 54m2 stops Sydney Kingsford Smith San Francisco

$2,655United Airlines

Tue, Oct 6 - Sat, Apr 3

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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

Mar 8

STL4:17 pmLambert-St Louis

25h 43m

2 stops

BNE10:00 amBrisbane

Mar 13

BNE6:10 pmBrisbane

42h 56m

2 stops

STL9:06 pmLambert-St Louis

$1,297

Air New Zealand

Mar 8

STL4:17 pmLambert-St Louis

23h 18m

2 stops

SYD8:35 amSydney Kingsford Smith

Mar 20

SYD7:25 pmSydney Kingsford Smith

42h 41m

2 stops

STL10:06 pmLambert-St Louis

$1,299

Air New Zealand

Feb 16

STL10:05 amLambert-St Louis

34h 40m

2 stops

MEL1:45 pmMelbourne

Mar 9

MEL12:10 pmMelbourne

26h 56m

2 stops

STL10:06 pmLambert-St Louis

$1,308

United Airlines flights from St. Louis to Australia

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

United Airlines

Oct 25

STL3:15 pmLambert-St Louis

26h 05m

2 stops

SYD9:20 amSydney Kingsford Smith

Nov 9

SYD11:50 amSydney Kingsford Smith

23h 19m

2 stops

STL6:09 pmLambert-St Louis

$1,228

United Airlines

Oct 25

STL1:08 pmLambert-St Louis

25h 52m

2 stops

SYD7:00 amSydney Kingsford Smith

Nov 10

SYD9:15 amSydney Kingsford Smith

21h 58m

1 stop

STL2:13 pmLambert-St Louis

$1,237

United Airlines

Nov 1

STL7:05 pmLambert-St Louis

21h 15m

1 stop

SYD9:20 amSydney Kingsford Smith

Nov 9

SYD9:15 amSydney Kingsford Smith

24h 35m

1 stop

STL4:50 pmLambert-St Louis

$1,238

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

Quickest round-trip

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 10/25

5:55 pm-7:00 am

1 stop21h 05m

Sydney Kingsford Smith

Mon 11/9

11:50 am-4:57 pm

2 stops22h 07m

$1,218

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 10/25

5:55 pm-7:00 am

1 stop21h 05m

Sydney Kingsford Smith

Mon 11/9

11:50 am-6:05 pm

1 stop23h 15m

$1,218

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

$1,224

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

$1,224

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 10/25

3:15 pm-9:20 am

2 stops26h 05m

Sydney Kingsford Smith

Mon 11/9

11:50 am-6:09 pm

2 stops23h 19m

$1,228

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 11/1

7:05 pm-9:20 am

1 stop21h 15m

Sydney Kingsford Smith

Mon 11/9

11:20 am-6:05 pm

2 stops23h 45m

$1,237

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Mon 11/30

2:48 pm-5:15 pm

2 stops33h 27m

Melbourne

Mon 1/25

10:45 pm-11:36 pm

1 stop41h 51m

$1,265

St. LouisMelbourne

STL Lambert-St Louis - MEL Melbourne

STLMEL

Lambert-St Louis

Mon 11/30

2:48 pm-5:15 pm

2 stops33h 27m

Melbourne

Mon 1/25

10:45 pm-11:36 pm

1 stop41h 51m

$1,266

St. LouisBrisbane

STL Lambert-St Louis - BNE Brisbane

STLBNE

Lambert-St Louis

Wed 1/13

3:00 pm-8:45 am

2 stops25h 45m

Brisbane

Sat 1/30

10:45 am-4:26 pm

2 stops21h 41m

$1,549

St. LouisBrisbane

STL Lambert-St Louis - BNE Brisbane

STLBNE

Lambert-St Louis

Wed 1/13

3:00 pm-8:45 am

2 stops25h 45m

Brisbane

Sun 1/31

10:45 am-7:23 pm

2 stops24h 38m

$1,549

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 $975. 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 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	$734
Fastest flight time	20h 24m
Direct flights	None

The best one-way flight to Australia from St. Louis in the past 72 hours is $734. The best round-trip flight deal from St. Louis to Australia found on momondo in the last 72 hours is $1,218.

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 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 1,103 reviews	Search Qantas Airways flights
Air Canada	PriceFrom $894	Free Cancellation	Rating 7.1 11,716 reviews	Search Air Canada flights
United Airlines	PriceFrom $1,029	Free Cancellation	Rating 7.4 10,282 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,233	Free Cancellation	Rating 7.0 12,132 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.