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

Qantas Airways and Cathay Pacific are the most popular carriers 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.

$1,285 Cheap Flights from St. Louis to Sydney in 2026/27

Find the cheapest flights from St. Louis to Sydney

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

17:55 - 07:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

21h 05m1 stop Houston George Bush Intcntl

11:50 - 18:05SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 15m1 stop San Francisco

$1,750Lufthansa

Sun, 25 Oct - Mon, 9 Nov

15:15 - 09:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

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

11:50 - 18:09SYD Sydney Kingsford Smith-STL Lambert-St Louis

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

$1,765United Airlines

Sun, 25 Oct - Mon, 9 Nov

19:05 - 09:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

22h 15m1 stop San Francisco

09:15 - 14:13SYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 58m1 stop Houston George Bush Intcntl

$1,777United Airlines

Sun, 25 Oct - Wed, 11 Nov

19:05 - 09:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

21h 15m1 stop San Francisco

09:15 - 16:50SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 35m1 stop Houston George Bush Intcntl

$1,779United Airlines

Sun, 1 Nov - Mon, 9 Nov

13:40 - 09:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 25m2 stops Denver Intl Los Angeles

11:20 - 18:05SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 45m2 stops Los Angeles San Francisco

$1,783United Airlines

Sun, 1 Nov - Mon, 9 Nov

16:39 - 09:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 41m2 stops Denver Intl San Francisco

11:50 - 18:09SYD Sydney Kingsford Smith-STL Lambert-St Louis

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

$1,785United Airlines

Sun, 1 Nov - Mon, 9 Nov

17:55 - 07:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

21h 05m1 stop Houston George Bush Intcntl

11:20 - 16:57SYD Sydney Kingsford Smith-STL Lambert-St Louis

22h 37m2 stops Los Angeles Denver Intl

$1,839United Airlines

Mon, 26 Oct - Thu, 12 Nov

14:55 - 07:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 05m1 stop Houston George Bush Intcntl

09:15 - 14:13SYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 58m1 stop Houston George Bush Intcntl

$1,849United Airlines

Thu, 29 Oct - Tue, 10 Nov

14:25 - 07:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 55m2 stops Atlanta Hartsfield-Jackson Los Angeles

10:40 - 16:43SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 03m2 stops Los Angeles Atlanta Hartsfield-Jackson

$1,855Delta

Thu, 29 Oct - Tue, 10 Nov

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

$1,867Air New Zealand

Mon, 8 Mar - Sat, 20 Mar

Cheap last-minute flights

Enter your travel dates to find the best prices.

16:42 - 18:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 08m2 stops Seattle/Tacoma Intl Honolulu

21:45 - 23:59SYD Sydney Kingsford Smith-STL Lambert-St Louis

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

$3,010Multiple Airlines

Wed, 7 Oct - Fri, 9 Oct

13:29 - 07:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

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

09:55 - 22:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

28h 35m2 stops Auckland Intl Houston George Bush Intcntl

$3,056Air New Zealand

Mon, 5 Oct - Wed, 7 Oct

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

32h 47m1 stop San Francisco

19:20 - 22:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

43h 10m2 stops Auckland Intl Houston George Bush Intcntl

$3,068Air New Zealand

Mon, 5 Oct - Wed, 7 Oct

13:36 - 08:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 24m2 stops Denver Intl Los Angeles

11:55 - 22:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 35m2 stops Auckland Intl Houston George Bush Intcntl

$3,088Air New Zealand

Tue, 6 Oct - Thu, 8 Oct

06:04 - 08:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 01m1 stop Los Angeles

13:00 - 18:20SYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 20m1 stop Dallas/Fort Worth

$3,416Qantas Airways

Mon, 5 Oct - Wed, 7 Oct

06:04 - 08:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 01m1 stop Los Angeles

18:50 - 23:46SYD Sydney Kingsford Smith-STL Lambert-St Louis

20h 56m1 stop Los Angeles

$3,485Qantas Airways

Wed, 7 Oct - Fri, 9 Oct

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

32h 47m1 stop San Francisco

19:20 - 20:16SYD Sydney Kingsford Smith-STL Lambert-St Louis

40h 56m2 stops Auckland Intl Houston George Bush Intcntl

$3,572Air New Zealand

Tue, 6 Oct - Thu, 8 Oct

06:04 - 08:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 01m1 stop Los Angeles

20:40 - 23:46SYD Sydney Kingsford Smith-STL Lambert-St Louis

43h 06m2 stops Melbourne Los Angeles

$3,589Qantas Airways

Wed, 7 Oct - Fri, 9 Oct

12:47 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 08m1 stop Dallas/Fort Worth

11:05 - 23:46SYD Sydney Kingsford Smith-STL Lambert-St Louis

52h 41m2 stops Melbourne Los Angeles

$3,643Qantas Airways

Tue, 6 Oct - Thu, 8 Oct

12:47 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 08m1 stop Dallas/Fort Worth

18:50 - 23:46SYD Sydney Kingsford Smith-STL Lambert-St Louis

20h 56m1 stop Los Angeles

$4,131Qantas Airways

Tue, 6 Oct - Thu, 8 Oct

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Air New Zealand flights from St. Louis to Sydney

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

Air New Zealand

8 Mar

STL16:17Lambert-St Louis

23h 18m

2 stops

SYD08:35Sydney Kingsford Smith

20 Mar

SYD19:25Sydney Kingsford Smith

42h 41m

2 stops

STL22:06Lambert-St Louis

$1,867

Air New Zealand

4 Feb

STL08:50Lambert-St Louis

30h 45m

2 stops

SYD08:35Sydney Kingsford Smith

15 Feb

SYD09:55Sydney Kingsford Smith

29h 11m

2 stops

STL22:06Lambert-St Louis

$1,907

Air New Zealand

29 Jan

STL10:07Lambert-St Louis

29h 28m

2 stops

SYD08:35Sydney Kingsford Smith

15 May

SYD19:20Sydney Kingsford Smith

41h 49m

2 stops

STL22:09Lambert-St Louis

$1,934

American Airlines flights from St. Louis to Sydney

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

American Airlines

4 Nov

STL08:10Lambert-St Louis

29h 15m

1 stop

SYD06:25Sydney Kingsford Smith

28 Nov

SYD14:05Sydney Kingsford Smith

22h 34m

1 stop

STL19:39Lambert-St Louis

$2,061

American Airlines

4 Nov

STL14:54Lambert-St Louis

25h 06m

2 stops

SYD09:00Sydney Kingsford Smith

28 Nov

SYD14:05Sydney Kingsford Smith

21h 00m

1 stop

STL18:05Lambert-St Louis

$2,068

American Airlines

13 Oct

STL06:04Lambert-St Louis

34h 01m

1 stop

SYD08:05Sydney Kingsford Smith

18 Nov

SYD14:05Sydney Kingsford Smith

26h 28m

1 stop

STL23:33Lambert-St Louis

$2,871

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 25/10

17:55-07:00

1 stop21h 05m

Sydney Kingsford Smith

Mon 9/11

11:50-18:05

1 stop23h 15m

$1,750

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 25/10

15:15-09:20

2 stops26h 05m

Sydney Kingsford Smith

Mon 9/11

11:50-18:09

2 stops23h 19m

$1,765

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 25/10

19:05-09:20

1 stop22h 15m

Sydney Kingsford Smith

Wed 11/11

09:15-14:13

1 stop21h 58m

$1,777

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 1/11

19:05-09:20

1 stop21h 15m

Sydney Kingsford Smith

Mon 9/11

09:15-16:50

1 stop24h 35m

$1,779

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 1/11

13:40-09:05

2 stops26h 25m

Sydney Kingsford Smith

Mon 9/11

11:20-18:05

2 stops23h 45m

$1,783

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 1/11

16:39-09:20

2 stops23h 41m

Sydney Kingsford Smith

Mon 9/11

11:50-18:09

2 stops23h 19m

$1,785

Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 26/10

17:55-07:00

1 stop21h 05m

Sydney Kingsford Smith

Thu 12/11

11:20-16:57

2 stops22h 37m

$1,839

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Thu 29/10

14:55-07:00

1 stop24h 05m

Sydney Kingsford Smith

Tue 10/11

09:15-14:13

1 stop21h 58m

$1,849

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Thu 29/10

14:25-07:20

2 stops24h 55m

Sydney Kingsford Smith

Tue 10/11

10:40-16:43

2 stops23h 03m

$1,855

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

$1,867

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 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 $1,668. 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 $1,752.

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

You could potentially save up to 1% on your flight if you consider stops on a St. Louis to Sydney flight.

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	$1,285
Fastest flight time	21h 15m
Direct flights	None

The best one-way flight to Sydney from St. Louis in the past 72 hours is $1,285. The best return flight deal from St. Louis to Sydney found on momondo in the last 72 hours is $1,750.

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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If you are simply researching potential flights to Sydney, momondo offers a useful price alert feature which will track prices for flights to Sydney from St. Louis and alert you when they change.