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

United Airlines and Delta 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.

$893 Cheap Flights from St. Louis to Sydney in 2026

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.

12:17 - 11:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 33m3 stops Las Vegas Harry Reid Intl Los Angeles Los Angeles Nadi

14:15 - 12:35SYD Sydney Kingsford Smith-STL Lambert-St Louis

38h 20m3 stops Nadi Los Angeles Los Angeles Las Vegas Harry Reid Intl

$1,692Multiple Airlines

Mon, 28 Sep - Sun, 18 Oct

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

24h 21m1 stop Dallas/Fort Worth

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

21h 20m1 stop Dallas/Fort Worth

$1,845Qantas Airways

Wed, 23 Sep - Wed, 7 Oct

13:08 - 07:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 52m2 stops Chicago O'Hare Intl Houston George Bush Intcntl

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

27h 05m1 stop San Francisco

$1,850United Airlines

Wed, 10 Feb - Wed, 17 Feb

15:52 - 06:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 58m2 stops Minneapolis St Paul Los Angeles Los Angeles

10:15 - 18:15SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 00m2 stops Los Angeles Los Angeles Atlanta Hartsfield-Jackson

$1,856Delta

Wed, 23 Sep - Wed, 7 Oct

14:30 - 06:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 20m2 stops Atlanta Hartsfield-Jackson Los Angeles Los Angeles

10:15 - 23:54SYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 39m2 stops Los Angeles Los Angeles Atlanta Hartsfield-Jackson

$1,857Delta

Wed, 23 Sep - Wed, 7 Oct

12:27 - 11:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 23m3 stops Las Vegas Harry Reid Intl Los Angeles Los Angeles Nadi

14:15 - 12:35SYD Sydney Kingsford Smith-STL Lambert-St Louis

38h 20m3 stops Nadi Los Angeles Los Angeles Las Vegas Harry Reid Intl

$1,863Multiple Airlines

Sun, 20 Sep - Thu, 15 Oct

10:14 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

29h 41m1 stop Dallas/Fort Worth

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

26h 42m1 stop Dallas/Fort Worth

$1,872American Airlines

Wed, 23 Sep - Wed, 7 Oct

10:14 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

29h 41m1 stop Dallas/Fort Worth

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

20h 56m1 stop Los Angeles Los Angeles

$1,874Qantas Airways

Wed, 23 Sep - Wed, 7 Oct

12:47 - 07:30STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 43m2 stops Dallas/Fort Worth Los Angeles Los Angeles

11:10 - 17:29SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 19m2 stops Los Angeles Los Angeles Charlotte Douglas

$1,878American Airlines

Tue, 13 Oct - Wed, 18 Nov

06:04 - 07:30STL Lambert-St Louis-SYD Sydney Kingsford Smith

33h 26m1 stop Los Angeles Los Angeles

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

26h 32m1 stop Los Angeles Los Angeles

$1,886American Airlines

Tue, 13 Oct - Wed, 18 Nov

Cheap last-minute flights

Enter your travel dates to find the best prices.

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

38h 45m2 stops Chicago O'Hare Intl Hong Kong Intl

21:55 - 18:38SYD Sydney Kingsford Smith-STL Lambert-St Louis

35h 43m2 stops Hong Kong Intl Seattle/Tacoma Intl

$2,052Multiple Airlines

Tue, 1 Sep - Tue, 8 Sep

12:45 - 20:10STL Lambert-St Louis-SYD Sydney Kingsford Smith

40h 25m2 stops Dallas/Fort Worth Hong Kong Intl

07:40 - 23:43SYD Sydney Kingsford Smith-STL Lambert-St Louis

31h 03m2 stops Hong Kong Intl Dallas/Fort Worth

$2,120Multiple Airlines

Tue, 1 Sep - Thu, 10 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

$2,226Multiple Airlines

Tue, 1 Sep - Thu, 10 Sep

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

26h 44m2 stops Denver Intl Vancouver Intl

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

26h 00m1 stop Toronto Pearson Intl

$2,464Air New Zealand

Tue, 1 Sep - Thu, 10 Sep

15:04 - 07:30STL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 26m2 stops Seattle/Tacoma Intl Los Angeles Los Angeles

17:50 - 14:04SYD Sydney Kingsford Smith-STL Lambert-St Louis

35h 14m2 stops Los Angeles Los Angeles Seattle/Tacoma Intl

$2,612Alaska Airlines

Mon, 31 Aug - Wed, 2 Sep

08:55 - 07:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

31h 25m1 stop Toronto Pearson Intl

09:20 - 14:00SYD Sydney Kingsford Smith-STL Lambert-St Louis

43h 40m1 stop Toronto Pearson Intl

$2,625Multiple Airlines

Tue, 1 Sep - Thu, 10 Sep

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

34h 05m1 stop Los Angeles Los Angeles

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

20h 09m1 stop Los Angeles Los Angeles

$2,770Qantas Airways

Mon, 31 Aug - Wed, 2 Sep

10:53 - 07:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

29h 27m3 stops Chicago O'Hare Intl Toronto Pearson Intl Vancouver Intl

09:20 - 22:59SYD Sydney Kingsford Smith-STL Lambert-St Louis

28h 39m3 stops Vancouver Intl Toronto Pearson Intl Chicago O'Hare Intl

$2,838Air Canada

Tue, 1 Sep - Thu, 10 Sep

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

34h 05m1 stop Los Angeles Los Angeles

06:25 - 22:59SYD Sydney Kingsford Smith-STL Lambert-St Louis

31h 34m2 stops Melbourne Los Angeles Los Angeles

$2,842Qantas Airways

Tue, 1 Sep - Tue, 8 Sep

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

31h 13m1 stop San Francisco

09:55 - 14:15SYD Sydney Kingsford Smith-STL Lambert-St Louis

43h 20m2 stops Auckland Intl Houston George Bush Intcntl

$2,860Air New Zealand

Mon, 31 Aug - Wed, 2 Sep

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American Airlines flights from St. Louis to Sydney

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

American Airlines

23 Sept

STL10:14Lambert-St Louis

29h 41m

1 stop

SYD06:55Sydney Kingsford Smith

7 Oct

SYD13:00Sydney Kingsford Smith

26h 42m

1 stop

STL23:42Lambert-St Louis

$1,872

American Airlines

13 Oct

STL12:47Lambert-St Louis

26h 43m

2 stops

SYD07:30Sydney Kingsford Smith

18 Nov

SYD11:10Sydney Kingsford Smith

23h 19m

2 stops

STL17:29Lambert-St Louis

$1,878

American Airlines

13 Oct

STL06:04Lambert-St Louis

33h 26m

1 stop

SYD07:30Sydney Kingsford Smith

18 Nov

SYD11:10Sydney Kingsford Smith

26h 32m

1 stop

STL20:42Lambert-St Louis

$1,886

Air Canada flights from St. Louis to Sydney

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

Air Canada

13 Oct

STL12:10Lambert-St Louis

28h 10m

2 stops

SYD08:20Sydney Kingsford Smith

18 Nov

SYD11:20Sydney Kingsford Smith

45h 06m

1 stop

STL15:26Lambert-St Louis

$1,902

Air Canada

13 Oct

STL12:10Lambert-St Louis

28h 10m

2 stops

SYD08:20Sydney Kingsford Smith

13 Nov

SYD11:20Sydney Kingsford Smith

45h 06m

2 stops

STL15:26Lambert-St Louis

$1,904

Air Canada

13 Oct

STL08:55Lambert-St Louis

31h 25m

1 stop

SYD08:20Sydney Kingsford Smith

18 Nov

SYD11:20Sydney Kingsford Smith

45h 06m

1 stop

STL15:26Lambert-St Louis

$1,909

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 28/9

12:17-11:50

3 stops32h 33m

Sydney Kingsford Smith

Sun 18/10

14:15-12:35

3 stops38h 20m

$1,692

Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 23/9

15:34-06:55

1 stop24h 21m

Sydney Kingsford Smith

Wed 7/10

13:00-18:20

1 stop21h 20m

$1,845

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 10/2

13:08-07:00

2 stops24h 52m

Sydney Kingsford Smith

Wed 17/2

11:50-21:55

1 stop27h 05m

$1,850

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 23/9

15:52-06:50

2 stops23h 58m

Sydney Kingsford Smith

Wed 7/10

10:15-18:15

2 stops24h 00m

$1,856

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 23/9

14:30-06:50

2 stops25h 20m

Sydney Kingsford Smith

Wed 7/10

10:15-23:54

2 stops29h 39m

$1,857

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 20/9

12:27-11:50

3 stops32h 23m

Sydney Kingsford Smith

Thu 15/10

14:15-12:35

3 stops38h 20m

$1,863

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 23/9

10:14-06:55

1 stop29h 41m

Sydney Kingsford Smith

Wed 7/10

13:00-23:42

1 stop26h 42m

$1,872

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 23/9

10:14-06:55

1 stop29h 41m

Sydney Kingsford Smith

Wed 7/10

18:50-23:46

1 stop20h 56m

$1,874

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 13/10

12:47-07:30

2 stops26h 43m

Sydney Kingsford Smith

Wed 18/11

11:10-17:29

2 stops23h 19m

$1,878

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 13/10

06:04-07:30

1 stop33h 26m

Sydney Kingsford Smith

Wed 18/11

11:10-20:42

1 stop26h 32m

$1,886

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 $1,839 to $2,082.
The lowest price recently found on this route was $1,692.

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 $1,615. 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 $1,696.

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	$893
Fastest flight time	21h 43m
Direct flights	None

The best one-way flight to Sydney from St. Louis in the past 72 hours is $893. The best return flight deal from St. Louis to Sydney found on momondo in the last 72 hours is $1,692.

The fastest flight from St. Louis to Sydney takes 21h 43m

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 43m.
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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