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

United Airlines, Delta, 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.

$913 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

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Enter your travel dates to find the best prices.

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

$1,765Air New Zealand

Mon, 8 Mar - Sat, 20 Mar

08:30 - 21:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

44h 20m2 stops San Francisco Auckland Intl

11:50 - 21:55SYD Sydney Kingsford Smith-STL Lambert-St Louis

27h 05m2 stops Auckland Intl San Francisco

$1,781Air New Zealand

Tue, 2 Feb - Tue, 23 Feb

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

33h 20m2 stops Houston George Bush Intcntl Auckland Intl

09:55 - 22:25SYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 30m2 stops Auckland Intl Houston George Bush Intcntl

$1,805Air New Zealand

Sun, 15 Nov - Thu, 19 Nov

06:15 - 12:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

37h 35m2 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

$1,831Air New Zealand

Mon, 8 Mar - Sat, 20 Mar

11:00 - 08:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

28h 35m2 stops Houston George Bush Intcntl Auckland Intl

19:25 - 22:15SYD Sydney Kingsford Smith-STL Lambert-St Louis

43h 50m2 stops Auckland Intl San Francisco

$1,833Air New Zealand

Mon, 9 Nov - Tue, 24 Nov

09:13 - 09:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

31h 07m2 stops Denver Intl San Francisco

13:20 - 21:55SYD Sydney Kingsford Smith-STL Lambert-St Louis

25h 35m1 stop San Francisco

$1,848United Airlines

Tue, 2 Feb - Tue, 23 Feb

15:20 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 35m1 stop Dallas/Fort Worth

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

26h 37m2 stops Brisbane Los Angeles

$1,851Qantas Airways

Sat, 31 Oct - Sat, 7 Nov

15:20 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 35m1 stop Dallas/Fort Worth

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

26h 37m2 stops Brisbane Los Angeles

$1,852Qantas Airways

Fri, 30 Oct - Fri, 6 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

16:39 - 08:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 21m2 stops Denver Intl Los Angeles

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

22h 15m1 stop San Francisco

$1,866United Airlines

Wed, 14 Oct - Tue, 27 Oct

Cheap last-minute flights

Enter your travel dates to find the best prices.

15:13 - 10:40STL Lambert-St Louis-SYD Sydney Kingsford Smith

28h 27m2 stops Houston George Bush Intcntl Auckland Intl

11:20 - 18:43SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 23m1 stop San Francisco

$2,240Air New Zealand

Fri, 18 Sep - Wed, 7 Oct

15:13 - 08:45STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 32m2 stops Houston George Bush Intcntl Auckland Intl

10:30 - 18:43SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 13m1 stop Los Angeles

$2,292Air New Zealand

Fri, 18 Sep - Wed, 7 Oct

15:13 - 08:45STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 32m2 stops Houston George Bush Intcntl Auckland Intl

10:30 - 18:43SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 13m2 stops Los Angeles San Francisco

$2,298Air New Zealand

Fri, 18 Sep - Wed, 7 Oct

08:35 - 08:45STL Lambert-St Louis-SYD Sydney Kingsford Smith

33h 10m2 stops Houston George Bush Intcntl Auckland Intl

11:20 - 18:43SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 23m1 stop San Francisco

$2,306Air New Zealand

Fri, 18 Sep - Wed, 7 Oct

06:15 - 08:45STL Lambert-St Louis-SYD Sydney Kingsford Smith

35h 30m2 stops Houston George Bush Intcntl Auckland Intl

11:20 - 18:43SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 23m1 stop San Francisco

$2,319Air New Zealand

Fri, 18 Sep - Wed, 7 Oct

12:10 - 07:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

28h 10m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

10:20 - 18:41SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 21m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

$2,340Air Canada

Wed, 23 Sep - Wed, 7 Oct

13:36 - 07:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 44m2 stops Denver Intl Vancouver Intl

10:20 - 18:41SYD Sydney Kingsford Smith-STL Lambert-St Louis

48h 21m2 stops Vancouver Intl Montreal Pierre Elliott Trudeau Intl

$2,341Multiple Airlines

Wed, 23 Sep - Wed, 7 Oct

12:10 - 07:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

28h 10m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

10:20 - 18:41SYD Sydney Kingsford Smith-STL Lambert-St Louis

48h 21m3 stops Vancouver Intl Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl

$2,351Air Canada

Wed, 23 Sep - Wed, 7 Oct

13:36 - 07:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 44m2 stops Denver Intl Vancouver Intl

10:20 - 18:41SYD Sydney Kingsford Smith-STL Lambert-St Louis

48h 21m3 stops Vancouver Intl Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl

$2,352Multiple Airlines

Wed, 23 Sep - Wed, 7 Oct

06:15 - 08:45STL Lambert-St Louis-SYD Sydney Kingsford Smith

35h 30m2 stops Houston George Bush Intcntl Auckland Intl

11:20 - 18:43SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 23m1 stop San Francisco

$2,375Air New Zealand

Fri, 18 Sep - Wed, 7 Oct

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Qantas Airways flights from St. Louis to Sydney

Our best Qantas Airways deals on St. Louis to Sydney flight tickets

Qantas Airways

31 Oct

STL15:20Lambert-St Louis

23h 35m

1 stop

SYD06:55Sydney Kingsford Smith

7 Nov

SYD11:05Sydney Kingsford Smith

26h 37m

2 stops

STL20:42Lambert-St Louis

$1,851

Qantas Airways

30 Oct

STL15:20Lambert-St Louis

23h 35m

1 stop

SYD06:55Sydney Kingsford Smith

6 Nov

SYD11:05Sydney Kingsford Smith

26h 37m

2 stops

STL20:42Lambert-St Louis

$1,852

Qantas Airways

8 Mar

STL14:54Lambert-St Louis

23h 01m

1 stop

SYD06:55Sydney Kingsford Smith

20 Mar

SYD06:05Sydney Kingsford Smith

23h 59m

2 stops

STL14:04Lambert-St Louis

$1,857

Air Canada flights from St. Louis to Sydney

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

Air Canada

15 Nov

STL09:40Lambert-St Louis

30h 55m

2 stops

SYD09:35Sydney Kingsford Smith

19 Nov

SYD11:20Sydney Kingsford Smith

40h 12m

3 stops

STL10:32Lambert-St Louis

$1,907

Air Canada

9 Nov

STL09:40Lambert-St Louis

30h 55m

3 stops

SYD09:35Sydney Kingsford Smith

24 Nov

SYD11:20Sydney Kingsford Smith

41h 50m

3 stops

STL12:10Lambert-St Louis

$1,920

Air Canada

8 Mar

STL16:05Lambert-St Louis

48h 30m

1 stop

SYD09:35Sydney Kingsford Smith

20 Mar

SYD10:20Sydney Kingsford Smith

45h 06m

1 stop

STL15:26Lambert-St Louis

$1,927

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

Mon 8/3

16:17-08:35

2 stops23h 18m

Sydney Kingsford Smith

Sat 20/3

19:25-22:06

2 stops42h 41m

$1,765

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 2/2

08:30-21:50

2 stops44h 20m

Sydney Kingsford Smith

Tue 23/2

11:50-21:55

2 stops27h 05m

$1,781

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 15/11

06:15-08:35

2 stops33h 20m

Sydney Kingsford Smith

Thu 19/11

09:55-22:25

2 stops29h 30m

$1,805

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/3

06:15-12:50

2 stops37h 35m

Sydney Kingsford Smith

Sat 20/3

19:25-22:06

2 stops42h 41m

$1,831

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 9/11

11:00-08:35

2 stops28h 35m

Sydney Kingsford Smith

Tue 24/11

19:25-22:15

2 stops43h 50m

$1,833

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 2/2

09:13-09:20

2 stops31h 07m

Sydney Kingsford Smith

Tue 23/2

13:20-21:55

1 stop25h 35m

$1,848

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 31/10

15:20-06:55

1 stop23h 35m

Sydney Kingsford Smith

Sat 7/11

11:05-20:42

2 stops26h 37m

$1,851

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 30/10

15:20-06:55

1 stop23h 35m

Sydney Kingsford Smith

Fri 6/11

11:05-20:42

2 stops26h 37m

$1,852

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

Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 14/10

16:39-08:00

2 stops23h 21m

Sydney Kingsford Smith

Tue 27/10

11:50-18:05

1 stop22h 15m

$1,866

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 $1,927 to $2,233.
The lowest price recently found on this route was $1,765.

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 $1,630. 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 $1,712.

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	$913
Fastest flight time	23h 01m
Direct flights	None

The best one-way flight to Sydney from St. Louis in the past 72 hours is $913. The best return flight deal from St. Louis to Sydney found on momondo in the last 72 hours is $1,765.

The fastest flight from St. Louis to Sydney takes 23h 01m

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 23h 01m.
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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