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

American Airlines 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.

$867 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.

06:00 - 07:05

STL

SYD

34h 05m

1 stop

09:10 - 22:59

SYD

STL

28h 49m

1 stop

$1,627Qantas Airways

Wed, 12 Aug - Sun, 30 Aug

15:32 - 06:55

STL

SYD

24h 23m

1 stop

12:00 - 18:05

SYD

STL

21h 05m

1 stop

$1,648Qantas Airways

Mon, 17 Aug - Mon, 24 Aug

15:32 - 06:55

STL

SYD

24h 23m

1 stop

12:00 - 18:05

SYD

STL

21h 05m

1 stop

$1,681Qantas Airways

Mon, 17 Aug - Mon, 24 Aug

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 18:17

SYD

STL

22h 57m

1 stop

$1,694United Airlines

Sun, 26 Jul - Sun, 9 Aug

15:13 - 07:00

STL

SYD

24h 47m

2 stops

10:20 - 17:59

SYD

STL

22h 39m

1 stop

$1,706United Airlines

Wed, 12 Aug - Sun, 30 Aug

12:59 - 06:55

STL

SYD

26h 56m

2 stops

10:20 - 19:16

SYD

STL

23h 56m

2 stops

$1,712United Airlines

Wed, 12 Aug - Sun, 30 Aug

12:52 - 06:50

STL

SYD

26h 58m

2 stops

09:15 - 23:58

SYD

STL

29h 43m

2 stops

$1,713Delta

Wed, 12 Aug - Sun, 30 Aug

17:11 - 06:55

STL

SYD

22h 44m

1 stop

09:10 - 18:05

SYD

STL

23h 55m

2 stops

$1,716American Airlines

Wed, 12 Aug - Sun, 30 Aug

19:10 - 17:40

STL

SYD

30h 30m

2 stops

11:20 - 23:42

SYD

STL

29h 22m

1 stop

$1,761Qantas Airways

Sat, 24 Oct - Tue, 3 Nov

06:00 - 07:05

STL

SYD

34h 05m

1 stop

12:45 - 16:14

SYD

STL

44h 29m

2 stops

$1,762Qantas Airways

Tue, 1 Sep - Sat, 6 Feb

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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

26 July

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

9 Aug

SYD10:20Sydney Kingsford Smith

22h 57m

1 stop

STL18:17Lambert-St Louis

$1,694

United Airlines

12 Aug

STL15:13Lambert-St Louis

24h 47m

2 stops

SYD07:00Sydney Kingsford Smith

30 Aug

SYD10:20Sydney Kingsford Smith

22h 39m

1 stop

STL17:59Lambert-St Louis

$1,706

United Airlines

12 Aug

STL12:59Lambert-St Louis

26h 56m

2 stops

SYD06:55Sydney Kingsford Smith

30 Aug

SYD10:20Sydney Kingsford Smith

23h 56m

2 stops

STL19:16Lambert-St Louis

$1,712

Qantas Airways flights from St. Louis to Sydney

Our best Qantas Airways deals on St. Louis to Sydney flight tickets

Qantas Airways

12 Aug

STL06:00Lambert-St Louis

34h 05m

1 stop

SYD07:05Sydney Kingsford Smith

30 Aug

SYD09:10Sydney Kingsford Smith

28h 49m

1 stop

STL22:59Lambert-St Louis

$1,627

Qantas Airways

17 Aug

STL15:32Lambert-St Louis

24h 23m

1 stop

SYD06:55Sydney Kingsford Smith

24 Aug

SYD12:00Sydney Kingsford Smith

21h 05m

1 stop

STL18:05Lambert-St Louis

$1,681

Qantas Airways

24 Oct

STL19:10Lambert-St Louis

30h 30m

2 stops

SYD17:40Sydney Kingsford Smith

3 Nov

SYD11:20Sydney Kingsford Smith

29h 22m

1 stop

STL23:42Lambert-St Louis

$1,761

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

06:00-07:05

1 stop34h 05m

Sydney Kingsford Smith

Sun 30/8

09:10-22:59

1 stop28h 49m

$1,627

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 17/8

15:32-06:55

1 stop24h 23m

Sydney Kingsford Smith

Mon 24/8

12:00-18:05

1 stop21h 05m

$1,648

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 17/8

15:32-06:55

1 stop24h 23m

Sydney Kingsford Smith

Mon 24/8

12:00-18:05

1 stop21h 05m

$1,681

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 26/7

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Sun 9/8

10:20-18:17

1 stop22h 57m

$1,694

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

15:13-07:00

2 stops24h 47m

Sydney Kingsford Smith

Sun 30/8

10:20-17:59

1 stop22h 39m

$1,706

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

12:59-06:55

2 stops26h 56m

Sydney Kingsford Smith

Sun 30/8

10:20-19:16

2 stops23h 56m

$1,712

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

12:52-06:50

2 stops26h 58m

Sydney Kingsford Smith

Sun 30/8

09:15-23:58

2 stops29h 43m

$1,713

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

17:11-06:55

1 stop22h 44m

Sydney Kingsford Smith

Sun 30/8

09:10-18:05

2 stops23h 55m

$1,716

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 24/10

19:10-17:40

2 stops30h 30m

Sydney Kingsford Smith

Tue 3/11

11:20-23:42

1 stop29h 22m

$1,761

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 1/9

06:00-07:05

1 stop34h 05m

Sydney Kingsford Smith

Sat 6/2

12:45-16:14

2 stops44h 29m

$1,762

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 $1,670. 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 $1,804.

Can stopping save me money on St. Louis to Sydney flights?

You could potentially save up to 42% 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	23h 07m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 23h 07m

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 23h 07m.
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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Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sydney?

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.

How can momondo help me find flights from St. Louis to Sydney?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Sydney.

I’m not ready to book a flight from St. Louis to Sydney right now. Can momondo alert me if prices change?

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.