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.

$878 Cheap Flights from St. Louis to Sydney in 2026

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.

17:18 - 11:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 47m2 stops Dallas/Fort Worth Brisbane

14:05 - 18:11SYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 06m1 stop Dallas/Fort Worth

$1,780Qantas Airways

Tue, 2 Feb - Sat, 27 Feb

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

37h 35m2 stops Houston George Bush Intcntl Auckland Intl

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

27h 05m2 stops Auckland Intl San Francisco

$1,798Air New Zealand

Tue, 2 Feb - Sat, 27 Feb

19:06 - 08:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

44h 29m2 stops San Francisco Auckland Intl

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

27h 05m2 stops Auckland Intl San Francisco

$1,815Air New Zealand

Sat, 13 Feb - Sat, 27 Feb

11:10 - 18:10STL Lambert-St Louis-SYD Sydney Kingsford Smith

39h 00m2 stops Houston George Bush Intcntl Auckland Intl

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

27h 05m2 stops Auckland Intl San Francisco

$1,826Air New Zealand

Tue, 20 Oct - Fri, 26 Feb

19:01 - 21:30STL Lambert-St Louis-SYD Sydney Kingsford Smith

33h 29m2 stops Dallas/Fort Worth Brisbane

14:05 - 18:11SYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 06m1 stop Dallas/Fort Worth

$1,834Qantas Airways

Sat, 13 Feb - Sat, 27 Feb

15:15 - 08:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 50m2 stops Chicago O'Hare Intl Los Angeles Los Angeles

11:50 - 16:59SYD Sydney Kingsford Smith-STL Lambert-St Louis

22h 09m2 stops San Francisco Chicago O'Hare Intl

$1,847United Airlines

Sun, 25 Oct - Mon, 9 Nov

15:34 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 21m1 stop Dallas/Fort Worth

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

20h 56m1 stop Los Angeles Los Angeles

$1,854Qantas Airways

Tue, 29 Sep - Tue, 6 Oct

16:39 - 07:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 21m2 stops Denver Intl Los Angeles Los Angeles

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

24h 13m2 stops Los Angeles Los Angeles San Francisco

$1,859United Airlines

Tue, 29 Sep - Tue, 6 Oct

15:12 - 10:40STL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 28m2 stops Houston George Bush Intcntl Auckland Intl

09:55 - 21:55SYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 00m2 stops Auckland Intl San Francisco

$1,864Air New Zealand

Mon, 19 Oct - Sat, 27 Feb

07:45 - 07:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 05m2 stops Salt Lake City Los Angeles Los Angeles

10:40 - 23:18SYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 38m2 stops Los Angeles Los Angeles Minneapolis St Paul

$1,866Delta

Sun, 18 Oct - Mon, 1 Mar

Cheap last-minute flights

Enter your travel dates to find the best prices.

06:00 - 08:40STL Lambert-St Louis-SYD Sydney Kingsford Smith

35h 40m2 stops Los Angeles Los Angeles Hong Kong Intl

14:05 - 20:44SYD Sydney Kingsford Smith-STL Lambert-St Louis

45h 39m2 stops Hong Kong Intl Chicago O'Hare Intl

$2,062Multiple Airlines

Mon, 7 Sep - Mon, 14 Sep

06:35 - 11:45STL Lambert-St Louis-SYD Sydney Kingsford Smith

38h 10m2 stops Seattle/Tacoma Intl Hong Kong Intl

21:55 - 23:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

40h 35m2 stops Hong Kong Intl Los Angeles Los Angeles

$2,131Multiple Airlines

Mon, 7 Sep - Sun, 27 Sep

06:00 - 11:45STL Lambert-St Louis-SYD Sydney Kingsford Smith

38h 45m2 stops Los Angeles Los Angeles Hong Kong Intl

14:05 - 18:38SYD Sydney Kingsford Smith-STL Lambert-St Louis

43h 33m2 stops Hong Kong Intl Seattle/Tacoma Intl

$2,132Multiple Airlines

Mon, 7 Sep - Mon, 14 Sep

16:40 - 07:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 40m2 stops Denver Intl Vancouver Intl

09:20 - 18:41SYD Sydney Kingsford Smith-STL Lambert-St Louis

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

$2,224Multiple Airlines

Sat, 5 Sep - Fri, 18 Sep

16:40 - 07:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 40m2 stops Denver Intl Vancouver Intl

09:20 - 18:41SYD Sydney Kingsford Smith-STL Lambert-St Louis

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

$2,235Multiple Airlines

Sat, 5 Sep - Fri, 18 Sep

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

52h 10m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

09:20 - 18:41SYD Sydney Kingsford Smith-STL Lambert-St Louis

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

$2,275Air Canada

Mon, 7 Sep - Sun, 27 Sep

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

52h 10m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

09:20 - 18:41SYD Sydney Kingsford Smith-STL Lambert-St Louis

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

$2,286Air Canada

Mon, 7 Sep - Sun, 27 Sep

06:15 - 21:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

48h 35m2 stops Houston George Bush Intcntl Auckland Intl

10:20 - 18:43SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 23m1 stop San Francisco

$2,287Air New Zealand

Mon, 7 Sep - Sun, 27 Sep

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

52h 10m3 stops Montreal Pierre Elliott Trudeau Intl Toronto Pearson Intl Vancouver Intl

09:20 - 18:41SYD Sydney Kingsford Smith-STL Lambert-St Louis

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

$2,297Air Canada

Mon, 7 Sep - Sun, 27 Sep

08:42 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

31h 13m1 stop San Francisco

19:20 - 22:27SYD Sydney Kingsford Smith-STL Lambert-St Louis

42h 07m2 stops Auckland Intl Houston George Bush Intcntl

$2,325Air New Zealand

Sun, 6 Sep - Tue, 8 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

25 Oct

STL15:15Lambert-St Louis

24h 50m

2 stops

SYD08:05Sydney Kingsford Smith

9 Nov

SYD11:50Sydney Kingsford Smith

22h 09m

2 stops

STL16:59Lambert-St Louis

$1,847

United Airlines

29 Sept

STL16:39Lambert-St Louis

23h 21m

2 stops

SYD07:00Sydney Kingsford Smith

6 Oct

SYD10:30Sydney Kingsford Smith

24h 13m

2 stops

STL18:43Lambert-St Louis

$1,859

United Airlines

2 Feb

STL08:30Lambert-St Louis

31h 50m

1 stop

SYD09:20Sydney Kingsford Smith

27 Feb

SYD11:50Sydney Kingsford Smith

27h 05m

1 stop

STL21:55Lambert-St Louis

$1,929

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

2 Feb

STL17:18Lambert-St Louis

24h 47m

2 stops

SYD11:05Sydney Kingsford Smith

27 Feb

SYD14:05Sydney Kingsford Smith

21h 06m

1 stop

STL18:11Lambert-St Louis

$1,780

Qantas Airways

13 Feb

STL19:01Lambert-St Louis

33h 29m

2 stops

SYD21:30Sydney Kingsford Smith

27 Feb

SYD14:05Sydney Kingsford Smith

21h 06m

1 stop

STL18:11Lambert-St Louis

$1,834

Qantas Airways

29 Sept

STL15:34Lambert-St Louis

24h 21m

1 stop

SYD06:55Sydney Kingsford Smith

6 Oct

SYD18:50Sydney Kingsford Smith

20h 56m

1 stop

STL23:46Lambert-St Louis

$1,854

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

Tue 2/2

17:18-11:05

2 stops24h 47m

Sydney Kingsford Smith

Sat 27/2

14:05-18:11

1 stop21h 06m

$1,780

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 2/2

06:15-12:50

2 stops37h 35m

Sydney Kingsford Smith

Sat 27/2

11:50-21:55

2 stops27h 05m

$1,798

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 13/2

19:06-08:35

2 stops44h 29m

Sydney Kingsford Smith

Sat 27/2

11:50-21:55

2 stops27h 05m

$1,815

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 20/10

11:10-18:10

2 stops39h 00m

Sydney Kingsford Smith

Fri 26/2

11:50-21:55

2 stops27h 05m

$1,826

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 13/2

19:01-21:30

2 stops33h 29m

Sydney Kingsford Smith

Sat 27/2

14:05-18:11

1 stop21h 06m

$1,834

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 25/10

15:15-08:05

2 stops24h 50m

Sydney Kingsford Smith

Mon 9/11

11:50-16:59

2 stops22h 09m

$1,847

Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 29/9

15:34-06:55

1 stop24h 21m

Sydney Kingsford Smith

Tue 6/10

18:50-23:46

1 stop20h 56m

$1,854

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 29/9

16:39-07:00

2 stops23h 21m

Sydney Kingsford Smith

Tue 6/10

10:30-18:43

2 stops24h 13m

$1,859

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 19/10

15:12-10:40

2 stops27h 28m

Sydney Kingsford Smith

Sat 27/2

09:55-21:55

2 stops29h 00m

$1,864

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 18/10

07:45-07:50

2 stops32h 05m

Sydney Kingsford Smith

Mon 1/3

10:40-23:18

2 stops29h 38m

$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 $1,848 to $2,093.
The lowest price recently found on this route was $1,780.

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 $1,623. 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 $1,704.

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	$878
Fastest flight time	24h 47m
Direct flights	None

The best one-way flight to Sydney from St. Louis in the past 72 hours is $878. The best return flight deal from St. Louis to Sydney found on momondo in the last 72 hours is $1,780.

The fastest flight from St. Louis to Sydney takes 24h 47m

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 24h 47m.
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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Why should I use momondo to find a flight deal from St. Louis to Sydney?

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.