What is the cheapest airline that flies from Lambert-St Louis to Sydney Kingsford Smith?

United Airlines is the most popular carrier operating from Lambert-St Louis to Sydney Kingsford Smith

When did momondo last update prices for flights from Lambert-St Louis Airport to Sydney Kingsford Smith Airport?

Prices for flights from Lambert-St Louis Airport to Sydney Kingsford Smith Airport refresh daily.

How old do you have to be to fly from Lambert-St Louis Airport to Sydney Kingsford Smith Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Sydney Kingsford Smith Airport.

What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?

The required travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's licence and a passport valid for six months after your intended arrival at Sydney Kingsford Smith Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$862 Cheap Flights from St. Louis to Sydney in 2026/27

Find the cheapest flights from St. Louis to Sydney

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One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

06:15 - 08:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

33h 20m2 stops Houston George Bush Intcntl Auckland Intl

11:50 - 22:15SYD Sydney Kingsford Smith-STL Lambert-St Louis

27h 25m2 stops Auckland Intl San Francisco

$1,736Air New Zealand

Sun, 1 Nov - Sun, 8 Nov

16:17 - 12:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 33m2 stops Houston George Bush Intcntl Auckland Intl

19:25 - 22:06SYD Sydney Kingsford Smith-STL Lambert-St Louis

42h 41m2 stops Auckland Intl Houston George Bush Intcntl

$1,763Air New Zealand

Mon, 8 Mar - Sat, 20 Mar

08:17 - 10:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

33h 18m2 stops San Francisco Auckland Intl

19:25 - 22:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

44h 05m2 stops Auckland Intl Houston George Bush Intcntl

$1,830Air New Zealand

Mon, 7 Dec - Wed, 16 Dec

14:54 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 01m1 stop Dallas/Fort Worth

11:05 - 20:42SYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 37m2 stops Brisbane Los Angeles

$1,853Qantas Airways

Thu, 5 Nov - Thu, 12 Nov

14:54 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 01m1 stop Dallas/Fort Worth

06:05 - 14:04SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 59m2 stops Brisbane Dallas/Fort Worth

$1,857Qantas Airways

Mon, 8 Mar - Sat, 20 Mar

15:03 - 08:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 32m2 stops Houston George Bush Intcntl Auckland Intl

11:50 - 23:24SYD Sydney Kingsford Smith-STL Lambert-St Louis

28h 34m3 stops Auckland Intl Los Angeles Chicago O'Hare Intl

$1,870Multiple Airlines

Tue, 2 Feb - Tue, 9 Feb

13:18 - 09:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 47m3 stops Chicago O'Hare Intl Houston George Bush Intcntl Los Angeles

11:50 - 20:57SYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 07m2 stops San Francisco Denver Intl

$1,875United Airlines

Mon, 7 Dec - Wed, 16 Dec

08:17 - 09:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 03m1 stop San Francisco

11:50 - 18:11SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 21m1 stop San Francisco

$1,884United Airlines

Mon, 7 Dec - Wed, 16 Dec

06:15 - 18:15STL Lambert-St Louis-SYD Sydney Kingsford Smith

43h 00m2 stops Houston George Bush Intcntl Auckland Intl

19:25 - 22:13SYD Sydney Kingsford Smith-STL Lambert-St Louis

43h 48m2 stops Auckland Intl Houston George Bush Intcntl

$1,887Air New Zealand

Sun, 31 Jan - Sat, 6 Feb

16:17 - 08:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 18m2 stops Houston George Bush Intcntl Auckland Intl

19:25 - 22:06SYD Sydney Kingsford Smith-STL Lambert-St Louis

42h 41m2 stops Auckland Intl Houston George Bush Intcntl

$1,888Air New Zealand

Mon, 8 Mar - Sat, 20 Mar

Cheap last-minute flights

Enter your travel dates to find the best prices.

06:29 - 07:30STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 01m2 stops Seattle/Tacoma Intl Los Angeles

17:50 - 14:21SYD Sydney Kingsford Smith-STL Lambert-St Louis

35h 31m2 stops Los Angeles Seattle/Tacoma Intl

$2,702Alaska Airlines

Sun, 27 Sep - Tue, 29 Sep

06:29 - 07:30STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 01m2 stops Seattle/Tacoma Intl Los Angeles

17:50 - 14:21SYD Sydney Kingsford Smith-STL Lambert-St Louis

35h 31m2 stops Los Angeles Seattle/Tacoma Intl

$2,852Alaska Airlines

Fri, 25 Sep - Sun, 27 Sep

07:08 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 47m1 stop San Francisco

10:55 - 22:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 35m2 stops Auckland Intl Houston George Bush Intcntl

$2,883Air New Zealand

Sun, 27 Sep - Tue, 29 Sep

06:30 - 07:30STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 00m1 stop Los Angeles

17:50 - 19:17SYD Sydney Kingsford Smith-STL Lambert-St Louis

40h 27m2 stops Los Angeles Denver Intl

$3,163Multiple Airlines

Fri, 25 Sep - Sun, 27 Sep

13:29 - 09:25STL Lambert-St Louis-SYD Sydney Kingsford Smith

28h 56m2 stops Chicago O'Hare Intl Tokyo Haneda

20:45 - 20:44SYD Sydney Kingsford Smith-STL Lambert-St Louis

38h 59m2 stops Doha Hamad Intl Chicago O'Hare Intl

$3,257Multiple Airlines

Thu, 24 Sep - Sat, 26 Sep

06:00 - 07:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 05m1 stop Los Angeles

09:10 - 23:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 20m1 stop Los Angeles

$3,296Qantas Airways

Thu, 24 Sep - Sat, 26 Sep

06:00 - 07:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 05m1 stop Los Angeles

17:50 - 23:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

20h 40m1 stop Los Angeles

$3,323Qantas Airways

Sun, 27 Sep - Tue, 29 Sep

12:17 - 13:25STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 08m3 stops Las Vegas Harry Reid Intl San Francisco Nadi

20:45 - 23:59SYD Sydney Kingsford Smith-STL Lambert-St Louis

42h 14m2 stops Doha Hamad Intl Seattle/Tacoma Intl

$3,351Multiple Airlines

Fri, 25 Sep - Sun, 27 Sep

09:04 - 09:25STL Lambert-St Louis-SYD Sydney Kingsford Smith

33h 21m2 stops Chicago O'Hare Intl Tokyo Haneda

17:50 - 23:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

20h 40m1 stop Los Angeles

$3,528Multiple Airlines

Thu, 24 Sep - Sat, 26 Sep

07:06 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 49m1 stop San Francisco

12:10 - 22:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

25h 20m2 stops Auckland Intl Houston George Bush Intcntl

$3,697Air New Zealand

Thu, 24 Sep - Sat, 26 Sep

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United Airlines flights from St. Louis to Sydney

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

United Airlines

7 Dec

STL13:18Lambert-St Louis

26h 47m

3 stops

SYD09:05Sydney Kingsford Smith

16 Dec

SYD11:50Sydney Kingsford Smith

26h 07m

2 stops

STL20:57Lambert-St Louis

$1,875

United Airlines

7 Dec

STL08:17Lambert-St Louis

32h 03m

1 stop

SYD09:20Sydney Kingsford Smith

16 Dec

SYD11:50Sydney Kingsford Smith

23h 21m

1 stop

STL18:11Lambert-St Louis

$1,884

United Airlines

1 Nov

STL11:00Lambert-St Louis

27h 00m

1 stop

SYD07:00Sydney Kingsford Smith

9 Nov

SYD11:20Sydney Kingsford Smith

23h 45m

2 stops

STL18:05Lambert-St Louis

$1,910

American Airlines flights from St. Louis to Sydney

Our best American Airlines deals on St. Louis to Sydney flight tickets

American Airlines

3 Nov

STL08:10Lambert-St Louis

29h 15m

1 stop

SYD06:25Sydney Kingsford Smith

10 Nov

SYD11:10Sydney Kingsford Smith

26h 32m

1 stop

STL20:42Lambert-St Louis

$1,891

American Airlines

19 Oct

STL12:46Lambert-St Louis

26h 44m

2 stops

SYD07:30Sydney Kingsford Smith

26 Oct

SYD11:10Sydney Kingsford Smith

24h 38m

2 stops

STL19:48Lambert-St Louis

$1,898

American Airlines

19 Oct

STL06:04Lambert-St Louis

33h 26m

1 stop

SYD07:30Sydney Kingsford Smith

26 Oct

SYD13:05Sydney Kingsford Smith

24h 54m

1 stop

STL21:59Lambert-St Louis

$1,906

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 1/11

06:15-08:35

2 stops33h 20m

Sydney Kingsford Smith

Sun 8/11

11:50-22:15

2 stops27h 25m

$1,736

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/3

16:17-12:50

2 stops27h 33m

Sydney Kingsford Smith

Sat 20/3

19:25-22:06

2 stops42h 41m

$1,763

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 7/12

08:17-10:35

2 stops33h 18m

Sydney Kingsford Smith

Wed 16/12

19:25-22:30

2 stops44h 05m

$1,830

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Thu 5/11

14:54-06:55

1 stop23h 01m

Sydney Kingsford Smith

Thu 12/11

11:05-20:42

2 stops26h 37m

$1,853

Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/3

14:54-06:55

1 stop23h 01m

Sydney Kingsford Smith

Sat 20/3

06:05-14:04

2 stops23h 59m

$1,857

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 2/2

15:03-08:35

2 stops24h 32m

Sydney Kingsford Smith

Tue 9/2

11:50-23:24

3 stops28h 34m

$1,870

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 7/12

13:18-09:05

3 stops26h 47m

Sydney Kingsford Smith

Wed 16/12

11:50-20:57

2 stops26h 07m

$1,875

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 7/12

08:17-09:20

1 stop32h 03m

Sydney Kingsford Smith

Wed 16/12

11:50-18:11

1 stop23h 21m

$1,884

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 31/1

06:15-18:15

2 stops43h 00m

Sydney Kingsford Smith

Sat 6/2

19:25-22:13

2 stops43h 48m

$1,887

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/3

16:17-08:35

2 stops23h 18m

Sydney Kingsford Smith

Sat 20/3

19:25-22:06

2 stops42h 41m

$1,888

Flights are sorted by cheapest return flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Sydney

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 typical price of a round-trip flight between St. Louis and Sydney?

Prices are currently low for flights on this route.

Typical prices usually range from $1,968 to $2,304.
The lowest price recently found on this route was $1,736.

What is the cheapest month to fly to Sydney?

The month of July is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $1,632. If you aren’t able to travel to Sydney during the month of July, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $1,714.

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

You could potentially save up to 19% on your flight if you consider stops on a St. Louis to Sydney flight.

How have St. Louis to Sydney flight prices changed over time?

When to book flights from St. Louis to Sydney

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sydney according to our flight data. Find out which month and days have the cheapest flights.

Estimated return price

Cheap St. Louis to Sydney (STL to SYD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sydney

Best price found	$862
Fastest flight time	21h 15m
Direct flights	None

The best one-way flight to Sydney from St. Louis in the past 72 hours is $862. The best return flight deal from St. Louis to Sydney found on momondo in the last 72 hours is $1,736.

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

There are no direct flights from St. Louis to Sydney. There are no popular flight routes from St. Louis to Sydney.

Search flight deals

Frequently asked questions about flying from St. Louis to Sydney

How far is Lambert-St Louis to Sydney Kingsford Smith by plane?
A flight from Lambert-St Louis to Sydney Kingsford Smith will travel around 14576.1 km. In terms of flight time, this usually takes a little over 21h 15m.
When did momondo last update prices for flights from Lambert-St Louis Airport to Sydney Kingsford Smith Airport?
Prices for flights from Lambert-St Louis Airport to Sydney Kingsford Smith Airport refresh daily.
How old do you have to be to fly from Lambert-St Louis Airport to Sydney Kingsford Smith Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Sydney Kingsford Smith Airport.
What documentation or ID do you need to fly to Sydney Kingsford Smith Airport?
The required travel and health documents for your Sydney Kingsford Smith Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's licence and a passport valid for six months after your intended arrival at Sydney Kingsford Smith Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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It is quick and easy to find St. Louis to Sydney flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Sydney that suits you.

Can I find flights from St. Louis to Sydney with flexible booking policies on momondo?

momondo does allow users to show only those flights to Sydney from St. Louis which offer a flexible booking policy as well as other useful filters and features.

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