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

Qantas Airways 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.

$1,024 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.

12:08 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 47m1 stop Dallas/Fort Worth

06:05 - 13:39SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 34m2 stops Brisbane Dallas/Fort Worth

$1,637Multiple Airlines

Mon, 8 Mar - Sat, 20 Mar

19:50 - 06:30STL Lambert-St Louis-SYD Sydney Kingsford Smith

43h 40m3 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl Los Angeles

09:45 - 19:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 45m3 stops Brisbane Los Angeles Dallas/Fort Worth

$1,639Multiple Airlines

Mon, 5 Apr - Tue, 11 May

19:50 - 06:25STL Lambert-St Louis-SYD Sydney Kingsford Smith

41h 35m3 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl Los Angeles

06:05 - 13:39SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 34m2 stops Brisbane Dallas/Fort Worth

$1,643Multiple Airlines

Mon, 8 Mar - Sat, 20 Mar

19:50 - 06:25STL Lambert-St Louis-SYD Sydney Kingsford Smith

41h 35m3 stops Chicago O'Hare Intl Phoenix Sky Harbor Intl Los Angeles

06:05 - 13:39SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 34m2 stops Brisbane Dallas/Fort Worth

$1,645Multiple Airlines

Mon, 8 Mar - Sat, 20 Mar

14:24 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 31m1 stop Dallas/Fort Worth

21:50 - 23:56SYD Sydney Kingsford Smith-STL Lambert-St Louis

42h 06m2 stops Brisbane Los Angeles

$1,688Qantas Airways

Fri, 5 Mar - Sun, 14 Mar

14:28 - 06:25STL Lambert-St Louis-SYD Sydney Kingsford Smith

22h 57m2 stops Phoenix Sky Harbor Intl Los Angeles

09:10 - 19:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

25h 20m3 stops Brisbane Los Angeles Dallas/Fort Worth

$1,709Multiple Airlines

Fri, 29 Jan - Sat, 15 May

06:04 - 09:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 56m1 stop Los Angeles

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

26h 32m1 stop Los Angeles

$1,728Qantas Airways

Sun, 25 Oct - Mon, 9 Nov

16:17 - 10:40STL Lambert-St Louis-SYD Sydney Kingsford Smith

27h 23m2 stops Houston George Bush Intcntl Auckland Intl

09:55 - 22:09SYD Sydney Kingsford Smith-STL Lambert-St Louis

27h 14m2 stops Auckland Intl San Francisco

$1,752Air New Zealand

Mon, 5 Apr - Tue, 11 May

17:55 - 07:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

21h 05m1 stop Houston George Bush Intcntl

11:50 - 20:59SYD Sydney Kingsford Smith-STL Lambert-St Louis

26h 09m2 stops San Francisco Denver Intl

$1,773United Airlines

Sun, 25 Oct - Mon, 9 Nov

14:55 - 09:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 10m2 stops Houston George Bush Intcntl Los Angeles

09:15 - 14:13SYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 58m1 stop Houston George Bush Intcntl

$1,778United Airlines

Tue, 3 Nov - Tue, 10 Nov

Cheap last-minute flights

Enter your travel dates to find the best prices.

10:14 - 07:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

29h 36m2 stops Atlanta Hartsfield-Jackson Los Angeles

10:40 - 17:41SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 01m2 stops Los Angeles Salt Lake City

$2,014Delta

Tue, 13 Oct - Wed, 18 Nov

07:00 - 07:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 50m2 stops Atlanta Hartsfield-Jackson Los Angeles

10:40 - 18:13SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 33m2 stops Los Angeles Atlanta Hartsfield-Jackson

$2,086Delta

Tue, 13 Oct - Fri, 13 Nov

14:31 - 07:30STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 59m2 stops Phoenix Sky Harbor Intl Los Angeles

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

21h 11m1 stop Dallas/Fort Worth

$2,139Multiple Airlines

Tue, 13 Oct - Fri, 13 Nov

06:04 - 08:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

34h 01m1 stop Los Angeles

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

21h 11m1 stop Dallas/Fort Worth

$2,158Qantas Airways

Tue, 13 Oct - Fri, 13 Nov

07:00 - 07:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

32h 50m2 stops Atlanta Hartsfield-Jackson Los Angeles

10:40 - 16:43SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 03m2 stops Los Angeles Atlanta Hartsfield-Jackson

$2,246Delta

Tue, 13 Oct - Wed, 18 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

$2,248American Airlines

Tue, 13 Oct - Wed, 18 Nov

06:04 - 20:45STL Lambert-St Louis-SYD Sydney Kingsford Smith

46h 41m2 stops Los Angeles Hong Kong Intl

22:20 - 21:59SYD Sydney Kingsford Smith-STL Lambert-St Louis

40h 39m2 stops Hong Kong Intl Dallas/Fort Worth

$2,251Multiple Airlines

Tue, 13 Oct - Wed, 18 Nov

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

26h 08m1 stop Dallas/Fort Worth

11:10 - 18:16SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 06m2 stops Los Angeles Dallas/Fort Worth

$2,254American Airlines

Tue, 13 Oct - Wed, 18 Nov

15:12 - 08:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 48m2 stops Houston George Bush Intcntl Los Angeles

11:20 - 16:50SYD Sydney Kingsford Smith-STL Lambert-St Louis

22h 30m2 stops Los Angeles Houston George Bush Intcntl

$2,273United Airlines

Tue, 13 Oct - Wed, 18 Nov

10:14 - 07:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

29h 36m2 stops Atlanta Hartsfield-Jackson Los Angeles

10:40 - 23:22SYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 42m2 stops Los Angeles Minneapolis St Paul

$2,317Delta

Tue, 13 Oct - Fri, 13 Nov

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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

STL16:39Lambert-St Louis

24h 01m

2 stops

SYD08:40Sydney Kingsford Smith

9 Nov

SYD09:15Sydney Kingsford Smith

24h 44m

2 stops

STL16:59Lambert-St Louis

$1,773

United Airlines

3 Nov

STL16:39Lambert-St Louis

23h 41m

2 stops

SYD09:20Sydney Kingsford Smith

10 Nov

SYD11:20Sydney Kingsford Smith

23h 45m

2 stops

STL18:05Lambert-St Louis

$1,778

United Airlines

7 Nov

STL19:05Lambert-St Louis

45h 35m

2 stops

SYD09:40Sydney Kingsford Smith

11 Nov

SYD09:15Sydney Kingsford Smith

21h 58m

1 stop

STL14:13Lambert-St Louis

$1,952

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

5 Apr

STL16:17Lambert-St Louis

27h 23m

2 stops

SYD10:40Sydney Kingsford Smith

11 May

SYD09:55Sydney Kingsford Smith

27h 14m

2 stops

STL22:09Lambert-St Louis

$1,752

Air New Zealand

5 Mar

STL06:15Lambert-St Louis

33h 20m

2 stops

SYD08:35Sydney Kingsford Smith

14 Mar

SYD09:55Sydney Kingsford Smith

28h 11m

2 stops

STL21:06Lambert-St Louis

$1,821

Air New Zealand

5 Apr

STL16:17Lambert-St Louis

25h 28m

2 stops

SYD08:45Sydney Kingsford Smith

11 May

SYD11:55Sydney Kingsford Smith

25h 14m

2 stops

STL22:09Lambert-St Louis

$1,839

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

12:08-06:55

1 stop25h 47m

Sydney Kingsford Smith

Sat 20/3

06:05-13:39

2 stops23h 34m

$1,637

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 5/4

19:50-06:30

3 stops43h 40m

Sydney Kingsford Smith

Tue 11/5

09:45-19:30

3 stops24h 45m

$1,639

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/3

19:50-06:25

3 stops41h 35m

Sydney Kingsford Smith

Sat 20/3

06:05-13:39

2 stops23h 34m

$1,643

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/3

19:50-06:25

3 stops41h 35m

Sydney Kingsford Smith

Sat 20/3

06:05-13:39

2 stops23h 34m

$1,645

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 5/3

14:24-06:55

1 stop23h 31m

Sydney Kingsford Smith

Sun 14/3

21:50-23:56

2 stops42h 06m

$1,688

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 29/1

14:28-06:25

2 stops22h 57m

Sydney Kingsford Smith

Sat 15/5

09:10-19:30

3 stops25h 20m

$1,709

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 25/10

06:04-09:00

1 stop34h 56m

Sydney Kingsford Smith

Mon 9/11

11:10-20:42

1 stop26h 32m

$1,728

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 5/4

16:17-10:40

2 stops27h 23m

Sydney Kingsford Smith

Tue 11/5

09:55-22:09

2 stops27h 14m

$1,752

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sun 25/10

17:55-07:00

1 stop21h 05m

Sydney Kingsford Smith

Mon 9/11

11:50-20:59

2 stops26h 09m

$1,773

Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 3/11

14:55-09:05

2 stops25h 10m

Sydney Kingsford Smith

Tue 10/11

09:15-14:13

1 stop21h 58m

$1,778

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 $1,669. 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 $1,752.

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	$1,024
Fastest flight time	21h 15m
Direct flights	None

The best one-way flight to Sydney from St. Louis in the past 72 hours is $1,024. The best return flight deal from St. Louis to Sydney found on momondo in the last 72 hours is $1,637.

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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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.