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

American Airlines, United Airlines, and Qantas Airways 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.

$917 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

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15:13 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 42m2 stops Houston George Bush Intcntl San Francisco

10:20 - 18:39SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 19m1 stop San Francisco

$1,754United Airlines

Mon, 31 Aug - Mon, 7 Sep

16:40 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 15m2 stops Denver Intl San Francisco

10:20 - 23:01SYD Sydney Kingsford Smith-STL Lambert-St Louis

27h 41m2 stops San Francisco Chicago O'Hare Intl

$1,760United Airlines

Mon, 31 Aug - Mon, 7 Sep

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

23h 01m1 stop Dallas/Fort Worth

06:05 - 12:28SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 23m2 stops Brisbane Dallas/Fort Worth

$1,870Qantas Airways

Sun, 1 Nov - Sun, 15 Nov

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

23h 35m1 stop Dallas/Fort Worth

06:05 - 12:28SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 23m2 stops Brisbane Dallas/Fort Worth

$1,872Qantas Airways

Mon, 26 Oct - Wed, 11 Nov

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

23h 01m1 stop Dallas/Fort Worth

06:05 - 12:34SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 29m2 stops Brisbane Dallas/Fort Worth

$1,873Qantas Airways

Tue, 17 Nov - Wed, 25 Nov

10:16 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

29h 39m1 stop Dallas/Fort Worth

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

29h 20m1 stop Los Angeles

$1,876American Airlines

Mon, 7 Sep - Mon, 14 Sep

12:45 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 10m1 stop Dallas/Fort Worth

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

29h 20m1 stop Los Angeles

$1,878American Airlines

Mon, 7 Sep - Sun, 27 Sep

19:05 - 09:40STL Lambert-St Louis-SYD Sydney Kingsford Smith

45h 35m2 stops San Francisco Brisbane

09:15 - 23:15SYD Sydney Kingsford Smith-STL Lambert-St Louis

31h 00m2 stops Houston George Bush Intcntl Chicago O'Hare Intl

$1,879United Airlines

Sat, 14 Nov - Wed, 18 Nov

13:25 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 30m2 stops Chicago O'Hare Intl Dallas/Fort Worth

09:10 - 16:40SYD Sydney Kingsford Smith-STL Lambert-St Louis

22h 30m2 stops Los Angeles Dallas/Fort Worth

$1,882American Airlines

Mon, 7 Sep - Sun, 27 Sep

12:46 - 07:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 19m2 stops Dallas/Fort Worth Los Angeles

13:00 - 23:42SYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 42m1 stop Dallas/Fort Worth

$1,883American Airlines

Wed, 23 Sep - Wed, 7 Oct

Cheap last-minute flights

Enter your travel dates to find the best prices.

12:45 - 07:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 20m2 stops Dallas/Fort Worth Los Angeles

12:00 - 18:05SYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 05m1 stop Dallas/Fort Worth

$1,812American Airlines

Fri, 7 Aug - Mon, 17 Aug

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

34h 05m1 stop Los Angeles

17:50 - 22:59SYD Sydney Kingsford Smith-STL Lambert-St Louis

20h 09m1 stop Los Angeles

$1,821American Airlines

Fri, 7 Aug - Mon, 17 Aug

05:10 - 07:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

35h 10m2 stops Denver Intl Vancouver Intl

09:20 - 12:02SYD Sydney Kingsford Smith-STL Lambert-St Louis

41h 42m3 stops Vancouver Intl Toronto Pearson Intl Chicago O'Hare Intl

$2,311Air Canada

Fri, 7 Aug - Mon, 17 Aug

05:10 - 07:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

35h 10m1 stop Vancouver Intl

09:20 - 19:16SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 56m2 stops Vancouver Intl Chicago O'Hare Intl

$2,398Air New Zealand

Sun, 9 Aug - Sat, 15 Aug

14:32 - 06:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 18m2 stops Salt Lake City Los Angeles

09:15 - 22:03SYD Sydney Kingsford Smith-STL Lambert-St Louis

27h 48m2 stops Los Angeles Minneapolis St Paul

$2,411Delta

Sun, 9 Aug - Sat, 15 Aug

06:00 - 07:30STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 30m1 stop Los Angeles

09:10 - 22:59SYD Sydney Kingsford Smith-STL Lambert-St Louis

28h 49m1 stop Los Angeles

$2,418Qantas Airways

Sun, 9 Aug - Sat, 15 Aug

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

34h 05m1 stop Los Angeles

09:10 - 22:59SYD Sydney Kingsford Smith-STL Lambert-St Louis

28h 49m1 stop Los Angeles

$2,562Qantas Airways

Thu, 6 Aug - Sat, 8 Aug

14:50 - 07:30STL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 40m2 stops Seattle/Tacoma Intl Los Angeles

17:50 - 13:52SYD Sydney Kingsford Smith-STL Lambert-St Louis

35h 02m2 stops Los Angeles Seattle/Tacoma Intl

$2,747Alaska Airlines

Thu, 6 Aug - Sat, 8 Aug

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

33h 00m3 stops Chicago O'Hare Intl Toronto Pearson Intl Vancouver Intl

09:20 - 19:16SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 56m2 stops Vancouver Intl Chicago O'Hare Intl

$2,921Air Canada

Sun, 9 Aug - Sat, 15 Aug

19:23 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

20h 32m1 stop San Francisco

11:55 - 22:45SYD Sydney Kingsford Smith-STL Lambert-St Louis

25h 50m2 stops Auckland Intl Houston George Bush Intcntl

$3,016Air New Zealand

Thu, 6 Aug - Sat, 8 Aug

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Delta flights from St. Louis to Sydney

Our best Delta deals on St. Louis to Sydney flight tickets

Delta

9 Aug

STL09:15Lambert-St Louis

30h 35m

2 stops

SYD06:50Sydney Kingsford Smith

23 Aug

SYD09:15Sydney Kingsford Smith

24h 40m

2 stops

STL18:55Lambert-St Louis

$1,744

Delta

7 Sept

STL11:00Lambert-St Louis

28h 50m

2 stops

SYD06:50Sydney Kingsford Smith

27 Sept

SYD09:15Sydney Kingsford Smith

29h 01m

2 stops

STL23:16Lambert-St Louis

$1,889

Delta

13 Oct

STL10:14Lambert-St Louis

29h 36m

2 stops

SYD07:50Sydney Kingsford Smith

13 Nov

SYD10:40Sydney Kingsford Smith

22h 52m

2 stops

STL16:32Lambert-St Louis

$1,960

American Airlines flights from St. Louis to Sydney

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

American Airlines

9 Aug

STL06:00Lambert-St Louis

34h 05m

1 stop

SYD07:05Sydney Kingsford Smith

23 Aug

SYD17:50Sydney Kingsford Smith

20h 09m

1 stop

STL22:59Lambert-St Louis

$1,765

American Airlines

7 Aug

STL12:45Lambert-St Louis

27h 20m

2 stops

SYD07:05Sydney Kingsford Smith

17 Aug

SYD12:00Sydney Kingsford Smith

21h 05m

1 stop

STL18:05Lambert-St Louis

$1,812

American Airlines

7 Aug

STL06:00Lambert-St Louis

34h 05m

1 stop

SYD07:05Sydney Kingsford Smith

17 Aug

SYD17:50Sydney Kingsford Smith

20h 09m

1 stop

STL22:59Lambert-St Louis

$1,821

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 31/8

15:13-06:55

2 stops24h 42m

Sydney Kingsford Smith

Mon 7/9

10:20-18:39

1 stop23h 19m

$1,754

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 31/8

16:40-06:55

2 stops23h 15m

Sydney Kingsford Smith

Mon 7/9

10:20-23:01

2 stops27h 41m

$1,760

Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 1/11

14:54-06:55

1 stop23h 01m

Sydney Kingsford Smith

Sun 15/11

06:05-12:28

2 stops23h 23m

$1,870

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 26/10

15:20-06:55

1 stop23h 35m

Sydney Kingsford Smith

Wed 11/11

06:05-12:28

2 stops23h 23m

$1,872

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 17/11

14:54-06:55

1 stop23h 01m

Sydney Kingsford Smith

Wed 25/11

06:05-12:34

2 stops23h 29m

$1,873

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 7/9

10:16-06:55

1 stop29h 39m

Sydney Kingsford Smith

Mon 14/9

09:10-23:30

1 stop29h 20m

$1,876

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 7/9

12:45-06:55

1 stop27h 10m

Sydney Kingsford Smith

Sun 27/9

09:10-23:30

1 stop29h 20m

$1,878

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 14/11

19:05-09:40

2 stops45h 35m

Sydney Kingsford Smith

Wed 18/11

09:15-23:15

2 stops31h 00m

$1,879

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 7/9

13:25-06:55

2 stops26h 30m

Sydney Kingsford Smith

Sun 27/9

09:10-16:40

2 stops22h 30m

$1,882

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 23/9

12:46-07:05

2 stops27h 19m

Sydney Kingsford Smith

Wed 7/10

13:00-23:42

1 stop26h 42m

$1,883

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 $1,863 to $2,204.
The lowest price recently found on this route was $1,754.

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 $1,646. 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 $1,778.

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

Fastest flight time	20h 32m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 20h 32m

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 20h 32m.
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.