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.

$1,095 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

$1,639Multiple 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

$1,646Multiple 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 - 18:13SYD Sydney Kingsford Smith-STL Lambert-St Louis

36h 23m2 stops Brisbane Dallas/Fort Worth

$1,671Qantas Airways

Mon, 8 Mar - Wed, 24 Mar

12:53 - 06:25STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 32m2 stops Dallas/Fort Worth San Francisco

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

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

$1,711Multiple Airlines

Fri, 29 Jan - Sat, 15 May

18:55 - 11:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 10m2 stops Dallas/Fort Worth Brisbane

14:05 - 17:46SYD Sydney Kingsford Smith-STL Lambert-St Louis

20h 41m1 stop Dallas/Fort Worth

$1,770Qantas Airways

Sat, 28 Nov - Sat, 5 Dec

12:53 - 06:25STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 32m2 stops Dallas/Fort Worth San Francisco

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

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

$1,780Multiple Airlines

Fri, 29 Jan - Sat, 15 May

12:53 - 06:25STL Lambert-St Louis-SYD Sydney Kingsford Smith

24h 32m2 stops Dallas/Fort Worth San Francisco

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

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

$1,782Multiple Airlines

Fri, 29 Jan - Sat, 15 May

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

$1,783Multiple 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

$1,789Multiple 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 - 18:13SYD Sydney Kingsford Smith-STL Lambert-St Louis

36h 23m2 stops Brisbane Dallas/Fort Worth

$1,809Qantas Airways

Mon, 8 Mar - Wed, 24 Mar

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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

8 Mar

STL14:24Lambert-St Louis

23h 31m

1 stop

SYD06:55Sydney Kingsford Smith

24 Mar

SYD21:50Sydney Kingsford Smith

36h 23m

2 stops

STL18:13Lambert-St Louis

$1,671

Qantas Airways

28 Nov

STL18:55Lambert-St Louis

23h 10m

2 stops

SYD11:05Sydney Kingsford Smith

5 Dec

SYD14:05Sydney Kingsford Smith

20h 41m

1 stop

STL17:46Lambert-St Louis

$1,770

Qantas Airways

8 Mar

STL14:24Lambert-St Louis

23h 31m

1 stop

SYD06:55Sydney Kingsford Smith

24 Mar

SYD21:50Sydney Kingsford Smith

36h 23m

2 stops

STL18:13Lambert-St Louis

$1,809

American Airlines flights from St. Louis to Sydney

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

American Airlines

8 Mar

STL14:24Lambert-St Louis

25h 36m

2 stops

SYD09:00Sydney Kingsford Smith

20 Mar

SYD06:05Sydney Kingsford Smith

23h 34m

2 stops

STL13:39Lambert-St Louis

$1,989

American Airlines

12 Apr

STL09:37Lambert-St Louis

30h 18m

1 stop

SYD06:55Sydney Kingsford Smith

27 Apr

SYD12:00Sydney Kingsford Smith

26h 04m

1 stop

STL23:04Lambert-St Louis

$1,992

American Airlines

25 Nov

STL13:14Lambert-St Louis

24h 41m

2 stops

SYD06:55Sydney Kingsford Smith

8 Dec

SYD11:10Sydney Kingsford Smith

23h 36m

2 stops

STL17:46Lambert-St Louis

$1,997

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

$1,639

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

$1,646

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/3

14:24-06:55

1 stop23h 31m

Sydney Kingsford Smith

Wed 24/3

21:50-18:13

2 stops36h 23m

$1,671

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 29/1

12:53-06:25

2 stops24h 32m

Sydney Kingsford Smith

Sat 15/5

09:10-19:30

3 stops25h 20m

$1,711

Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 28/11

18:55-11:05

2 stops23h 10m

Sydney Kingsford Smith

Sat 5/12

14:05-17:46

1 stop20h 41m

$1,770

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 29/1

12:53-06:25

2 stops24h 32m

Sydney Kingsford Smith

Sat 15/5

09:10-19:30

3 stops25h 20m

$1,780

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Fri 29/1

12:53-06:25

2 stops24h 32m

Sydney Kingsford Smith

Sat 15/5

09:10-19:30

3 stops25h 20m

$1,782

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

$1,783

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

$1,789

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/3

14:24-06:55

1 stop23h 31m

Sydney Kingsford Smith

Wed 24/3

21:50-18:13

2 stops36h 23m

$1,809

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 March is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $1,754. 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 $1,877.

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	$1,095
Fastest flight time	24h 32m
Direct flights	None

The best one-way flight to Sydney from St. Louis in the past 72 hours is $1,095. The best return flight deal from St. Louis to Sydney found on momondo in the last 72 hours is $1,639.

The fastest flight from St. Louis to Sydney takes 24h 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 24h 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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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.