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

Qantas Airways and United Airlines 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.

$1,038 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.

13:20 - 09:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 15m2 stops Denver Intl Vancouver Intl

10:20 - 15:26SYD Sydney Kingsford Smith-STL Lambert-St Louis

45h 06m2 stops Vancouver Intl Toronto Pearson Intl

$1,543Multiple Airlines

Mon, 8 Mar - Sat, 20 Mar

13:20 - 09:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 15m2 stops Denver Intl Vancouver Intl

10:20 - 15:26SYD Sydney Kingsford Smith-STL Lambert-St Louis

45h 06m2 stops Vancouver Intl Toronto Pearson Intl

$1,545Multiple Airlines

Mon, 8 Mar - Thu, 18 Mar

13:20 - 09:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 15m2 stops Denver Intl Vancouver Intl

10:20 - 21:13SYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 53m2 stops Vancouver Intl Chicago O'Hare Intl

$1,546Air Canada

Mon, 8 Mar - Sat, 20 Mar

16:05 - 09:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

48h 30m1 stop Toronto Pearson Intl

10:20 - 15:26SYD Sydney Kingsford Smith-STL Lambert-St Louis

45h 06m2 stops Vancouver Intl Toronto Pearson Intl

$1,547Air Canada

Mon, 8 Mar - Sat, 20 Mar

16:05 - 09:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

48h 30m2 stops Toronto Pearson Intl Vancouver Intl

11:20 - 15:26SYD Sydney Kingsford Smith-STL Lambert-St Louis

45h 06m2 stops Vancouver Intl Toronto Pearson Intl

$1,549Air Canada

Wed, 18 Nov - Wed, 25 Nov

13:20 - 09:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 15m2 stops Denver Intl Vancouver Intl

10:20 - 21:13SYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 53m2 stops Vancouver Intl Chicago O'Hare Intl

$1,594Air Canada

Mon, 8 Mar - Sat, 20 Mar

16:05 - 09:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

48h 30m2 stops Toronto Pearson Intl Vancouver Intl

11:20 - 12:10SYD Sydney Kingsford Smith-STL Lambert-St Louis

41h 50m3 stops Vancouver Intl Toronto Pearson Intl Chicago O'Hare Intl

$1,690Air Canada

Sat, 7 Nov - Wed, 11 Nov

17:34 - 09:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

47h 01m3 stops Chicago O'Hare Intl Toronto Pearson Intl Vancouver Intl

11:20 - 12:10SYD Sydney Kingsford Smith-STL Lambert-St Louis

41h 50m3 stops Vancouver Intl Toronto Pearson Intl Chicago O'Hare Intl

$1,704Air Canada

Sat, 7 Nov - Wed, 11 Nov

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

23h 05m1 stop Houston George Bush Intcntl

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

24h 35m1 stop Houston George Bush Intcntl

$1,707United Airlines

Wed, 18 Nov - Wed, 25 Nov

16:05 - 09:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

48h 30m2 stops Toronto Pearson Intl Vancouver Intl

11:20 - 15:26SYD Sydney Kingsford Smith-STL Lambert-St Louis

45h 06m2 stops Vancouver Intl Toronto Pearson Intl

$1,708Air Canada

Sat, 7 Nov - Wed, 11 Nov

Cheap last-minute flights

Enter your travel dates to find the best prices.

13:40 - 08:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 55m2 stops Denver Intl Vancouver Intl

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

23h 45m2 stops Vancouver Intl San Francisco

$1,483Multiple Airlines

Mon, 26 Oct - Mon, 9 Nov

12:10 - 08:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

52h 25m2 stops Montreal Pierre Elliott Trudeau Intl Vancouver Intl

10:20 - 16:23SYD Sydney Kingsford Smith-STL Lambert-St Louis

46h 03m2 stops Vancouver Intl Toronto Pearson Intl

$1,542Air Canada

Sat, 24 Oct - Sat, 31 Oct

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

23h 35m1 stop Dallas/Fort Worth

14:05 - 18:16SYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 11m1 stop Dallas/Fort Worth

$1,690Qantas Airways

Mon, 26 Oct - Mon, 9 Nov

15:20 - 09:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 40m2 stops Dallas/Fort Worth Los Angeles

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

23h 15m1 stop Dallas/Fort Worth

$1,691American Airlines

Mon, 26 Oct - Mon, 9 Nov

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

26h 08m1 stop Dallas/Fort Worth

11:10 - 20:42SYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 32m1 stop Los Angeles

$1,704Qantas Airways

Wed, 28 Oct - Wed, 4 Nov

13:40 - 08:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 55m2 stops Denver Intl Vancouver Intl

11:20 - 23:24SYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 04m3 stops Vancouver Intl Toronto Pearson Intl Chicago O'Hare Intl

$1,708Air Canada

Mon, 26 Oct - Mon, 9 Nov

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

23h 35m1 stop Dallas/Fort Worth

14:05 - 19:16SYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 11m1 stop Dallas/Fort Worth

$1,744Qantas Airways

Mon, 26 Oct - Sun, 1 Nov

08:55 - 08:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

55h 40m2 stops Toronto Pearson Intl Vancouver Intl

10:20 - 13:10SYD Sydney Kingsford Smith-STL Lambert-St Louis

42h 50m3 stops Vancouver Intl Toronto Pearson Intl Chicago O'Hare Intl

$1,761Air Canada

Sat, 24 Oct - Sat, 31 Oct

15:20 - 09:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 40m2 stops Dallas/Fort Worth Los Angeles

11:15 - 19:16SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 01m2 stops Los Angeles Dallas/Fort Worth

$1,778American Airlines

Mon, 26 Oct - Sun, 1 Nov

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

23h 35m1 stop Dallas/Fort Worth

06:05 - 14:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 25m2 stops Brisbane Dallas/Fort Worth

$1,789Qantas Airways

Sat, 24 Oct - Sat, 31 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

26 Oct

STL15:20Lambert-St Louis

23h 35m

1 stop

SYD06:55Sydney Kingsford Smith

9 Nov

SYD14:05Sydney Kingsford Smith

21h 11m

1 stop

STL18:16Lambert-St Louis

$1,690

Qantas Airways

28 Oct

STL12:47Lambert-St Louis

26h 08m

1 stop

SYD06:55Sydney Kingsford Smith

4 Nov

SYD11:10Sydney Kingsford Smith

26h 32m

1 stop

STL20:42Lambert-St Louis

$1,704

Qantas Airways

26 Oct

STL15:20Lambert-St Louis

23h 35m

1 stop

SYD06:55Sydney Kingsford Smith

1 Nov

SYD14:05Sydney Kingsford Smith

21h 11m

1 stop

STL19:16Lambert-St Louis

$1,744

American Airlines flights from St. Louis to Sydney

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

American Airlines

26 Oct

STL15:20Lambert-St Louis

25h 40m

2 stops

SYD09:00Sydney Kingsford Smith

9 Nov

SYD14:05Sydney Kingsford Smith

23h 15m

1 stop

STL20:20Lambert-St Louis

$1,691

American Airlines

8 Mar

STL10:20Lambert-St Louis

27h 35m

1 stop

SYD06:55Sydney Kingsford Smith

20 Mar

SYD11:15Sydney Kingsford Smith

28h 41m

1 stop

STL23:56Lambert-St Louis

$1,772

American Airlines

8 Mar

STL10:20Lambert-St Louis

27h 35m

1 stop

SYD06:55Sydney Kingsford Smith

20 Mar

SYD11:15Sydney Kingsford Smith

28h 41m

1 stop

STL23:56Lambert-St Louis

$1,774

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

13:20-09:35

2 stops27h 15m

Sydney Kingsford Smith

Sat 20/3

10:20-15:26

2 stops45h 06m

$1,543

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/3

13:20-09:35

2 stops27h 15m

Sydney Kingsford Smith

Thu 18/3

10:20-15:26

2 stops45h 06m

$1,545

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/3

13:20-09:35

2 stops27h 15m

Sydney Kingsford Smith

Sat 20/3

10:20-21:13

2 stops26h 53m

$1,546

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/3

16:05-09:35

1 stop48h 30m

Sydney Kingsford Smith

Sat 20/3

10:20-15:26

2 stops45h 06m

$1,547

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 18/11

16:05-09:35

2 stops48h 30m

Sydney Kingsford Smith

Wed 25/11

11:20-15:26

2 stops45h 06m

$1,549

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/3

13:20-09:35

2 stops27h 15m

Sydney Kingsford Smith

Sat 20/3

10:20-21:13

2 stops26h 53m

$1,594

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 7/11

16:05-09:35

2 stops48h 30m

Sydney Kingsford Smith

Wed 11/11

11:20-12:10

3 stops41h 50m

$1,690

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 7/11

17:34-09:35

3 stops47h 01m

Sydney Kingsford Smith

Wed 11/11

11:20-12:10

3 stops41h 50m

$1,704

Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 18/11

14:55-07:00

1 stop23h 05m

Sydney Kingsford Smith

Wed 25/11

09:15-16:50

1 stop24h 35m

$1,707

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 7/11

16:05-09:35

2 stops48h 30m

Sydney Kingsford Smith

Wed 11/11

11:20-15:26

2 stops45h 06m

$1,708

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 $1,994 to $2,530.
The lowest price recently found on this route was $1,543.

What is the cheapest month to fly to Sydney?

The month of March is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $1,735. If you aren’t able to travel to Sydney during the month of March, then flying in July is also cheap. Prices for this month can be found on momondo for an average of $1,856.

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	$1,038
Fastest flight time	22h 57m
Direct flights	None

The best one-way flight to Sydney from St. Louis in the past 72 hours is $1,038. The best return flight deal from St. Louis to Sydney found on momondo in the last 72 hours is $1,543.

The fastest flight from St. Louis to Sydney takes 22h 57m

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 22h 57m.
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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momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Sydney.

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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.