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

United Airlines, Delta, and Turkish 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.

$1,065 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

Cheap return flights

Enter your travel dates to find the best prices.

19:05 - 09:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

21h 15m1 stop San Francisco

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

24h 35m1 stop Houston George Bush Intcntl

$1,763United Airlines

Sun, 1 Nov - Mon, 9 Nov

16:39 - 09:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 41m2 stops Denver Intl San Francisco

11:50 - 18:09SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 19m2 stops San Francisco Chicago O'Hare Intl

$1,769United Airlines

Sun, 1 Nov - Mon, 9 Nov

14:22 - 07:20STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 58m2 stops Salt Lake City Los Angeles

10:40 - 23:56SYD Sydney Kingsford Smith-STL Lambert-St Louis

30h 16m2 stops Los Angeles Atlanta Hartsfield-Jackson

$1,771Delta

Sun, 25 Oct - Mon, 9 Nov

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

24h 05m1 stop Houston George Bush Intcntl

09:10 - 16:50SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 40m1 stop Houston George Bush Intcntl

$1,835United Airlines

Tue, 27 Oct - Thu, 12 Nov

17:55 - 08:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

45h 40m2 stops Houston George Bush Intcntl Auckland Intl

11:50 - 22:06SYD Sydney Kingsford Smith-STL Lambert-St Louis

27h 16m2 stops Auckland Intl Houston George Bush Intcntl

$1,904Air New Zealand

Sat, 30 Jan - Fri, 12 Feb

11:00 - 07:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 00m1 stop Houston George Bush Intcntl

09:10 - 14:13SYD Sydney Kingsford Smith-STL Lambert-St Louis

22h 03m1 stop Houston George Bush Intcntl

$1,906United Airlines

Thu, 12 Nov - Thu, 19 Nov

13:36 - 07:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 19m2 stops Denver Intl San Francisco

11:50 - 16:57SYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 07m2 stops San Francisco Denver Intl

$1,912United Airlines

Fri, 23 Oct - Fri, 30 Oct

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

$1,917Air New Zealand

Mon, 8 Mar - Sat, 20 Mar

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

$1,922Air New Zealand

Mon, 8 Mar - Sat, 20 Mar

15:45 - 11:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 20m2 stops Dallas/Fort Worth Brisbane

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

21h 06m1 stop Dallas/Fort Worth

$1,924Qantas Airways

Sat, 30 Jan - Fri, 12 Feb

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 Hong Kong Intl

08:40 - 23:42SYD Sydney Kingsford Smith-STL Lambert-St Louis

31h 02m2 stops Hong Kong Intl Dallas/Fort Worth

$2,306Multiple Airlines

Thu, 1 Oct - Thu, 8 Oct

15:12 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 43m2 stops Houston George Bush Intcntl San Francisco

08:55 - 22:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

28h 35m2 stops Auckland Intl Houston George Bush Intcntl

$2,510Air New Zealand

Thu, 1 Oct - Sat, 3 Oct

07:08 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 47m1 stop San Francisco

18:15 - 22:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

44h 15m2 stops Auckland Intl Houston George Bush Intcntl

$2,869Air New Zealand

Thu, 1 Oct - Thu, 8 Oct

13:29 - 07:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

26h 26m2 stops Chicago O'Hare Intl San Francisco

11:55 - 22:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 35m2 stops Auckland Intl Houston George Bush Intcntl

$2,974Air New Zealand

Mon, 5 Oct - Sat, 10 Oct

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

32h 47m1 stop San Francisco

11:55 - 22:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 35m2 stops Auckland Intl Houston George Bush Intcntl

$2,996Air New Zealand

Mon, 5 Oct - Sat, 10 Oct

07:08 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 47m1 stop San Francisco

10:55 - 22:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 35m2 stops Auckland Intl Houston George Bush Intcntl

$3,071Air New Zealand

Thu, 1 Oct - Sat, 3 Oct

08:55 - 10:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

33h 10m2 stops Toronto Pearson Intl Incheon 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

$3,139Multiple Airlines

Mon, 5 Oct - Sat, 10 Oct

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

34h 27m2 stops Dallas/Fort Worth Hong Kong Intl

22:05 - 21:21SYD Sydney Kingsford Smith-STL Lambert-St Louis

63h 16m3 stops Kuala Lumpur Intl Istanbul Chicago O'Hare Intl

$3,451Multiple Airlines

Thu, 1 Oct - Thu, 8 Oct

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

33h 26m1 stop Los Angeles

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

20h 56m1 stop Los Angeles

$3,466American Airlines

Mon, 5 Oct - Sat, 10 Oct

07:08 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 47m1 stop San Francisco

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

23h 23m1 stop San Francisco

$3,514United Airlines

Thu, 1 Oct - Thu, 8 Oct

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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

1 Nov

STL19:05Lambert-St Louis

21h 15m

1 stop

SYD09:20Sydney Kingsford Smith

9 Nov

SYD09:15Sydney Kingsford Smith

24h 35m

1 stop

STL16:50Lambert-St Louis

$1,763

United Airlines

1 Nov

STL16:39Lambert-St Louis

23h 41m

2 stops

SYD09:20Sydney Kingsford Smith

9 Nov

SYD11:50Sydney Kingsford Smith

23h 19m

2 stops

STL18:09Lambert-St Louis

$1,769

United Airlines

27 Oct

STL14:55Lambert-St Louis

24h 05m

1 stop

SYD07:00Sydney Kingsford Smith

12 Nov

SYD09:10Sydney Kingsford Smith

24h 40m

1 stop

STL16:50Lambert-St Louis

$1,835

Air New Zealand flights from St. Louis to Sydney

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

Air New Zealand

30 Jan

STL17:55Lambert-St Louis

45h 40m

2 stops

SYD08:35Sydney Kingsford Smith

12 Feb

SYD11:50Sydney Kingsford Smith

27h 16m

2 stops

STL22:06Lambert-St Louis

$1,904

Air New Zealand

8 Mar

STL16:17Lambert-St Louis

23h 18m

2 stops

SYD08:35Sydney Kingsford Smith

20 Mar

SYD19:25Sydney Kingsford Smith

42h 41m

2 stops

STL22:06Lambert-St Louis

$1,917

Air New Zealand

8 Mar

STL16:17Lambert-St Louis

23h 18m

2 stops

SYD08:35Sydney Kingsford Smith

20 Mar

SYD19:25Sydney Kingsford Smith

42h 41m

2 stops

STL22:06Lambert-St Louis

$1,922

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 1/11

19:05-09:20

1 stop21h 15m

Sydney Kingsford Smith

Mon 9/11

09:15-16:50

1 stop24h 35m

$1,763

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 1/11

16:39-09:20

2 stops23h 41m

Sydney Kingsford Smith

Mon 9/11

11:50-18:09

2 stops23h 19m

$1,769

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 25/10

14:22-07:20

2 stops24h 58m

Sydney Kingsford Smith

Mon 9/11

10:40-23:56

2 stops30h 16m

$1,771

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 27/10

14:55-07:00

1 stop24h 05m

Sydney Kingsford Smith

Thu 12/11

09:10-16:50

1 stop24h 40m

$1,835

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 30/1

17:55-08:35

2 stops45h 40m

Sydney Kingsford Smith

Fri 12/2

11:50-22:06

2 stops27h 16m

$1,904

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Thu 12/11

11:00-07:00

1 stop27h 00m

Sydney Kingsford Smith

Thu 19/11

09:10-14:13

1 stop22h 03m

$1,906

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 23/10

13:36-07:55

2 stops26h 19m

Sydney Kingsford Smith

Fri 30/10

11:50-16:57

2 stops21h 07m

$1,912

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

$1,917

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

$1,922

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 30/1

15:45-11:05

2 stops26h 20m

Sydney Kingsford Smith

Fri 12/2

14:05-18:11

1 stop21h 06m

$1,924

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 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 $1,654. 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 $1,736.

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	$1,065
Fastest flight time	21h 15m
Direct flights	None

The best one-way flight to Sydney from St. Louis in the past 72 hours is $1,065. The best return flight deal from St. Louis to Sydney found on momondo in the last 72 hours is $1,763.

The fastest flight from St. Louis to Sydney takes 21h 15m

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 15m.
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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