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

Delta and Qantas Airways 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.

15:32 - 07:00

STL

SYD

24h 28m

2 stops

10:20 - 18:43

SYD

STL

23h 23m

1 stop

$1,687United Airlines

Sun, 30 Aug - Mon, 28 Sep

08:42 - 06:55

STL

SYD

31h 13m

1 stop

10:20 - 18:43

SYD

STL

23h 23m

1 stop

$1,694United Airlines

Sun, 30 Aug - Mon, 28 Sep

16:40 - 07:00

STL

SYD

23h 20m

2 stops

10:20 - 16:37

SYD

STL

21h 17m

2 stops

$1,760United Airlines

Fri, 28 Aug - Wed, 30 Sep

08:42 - 06:55

STL

SYD

31h 13m

1 stop

10:20 - 18:43

SYD

STL

23h 23m

1 stop

$1,766United Airlines

Fri, 28 Aug - Mon, 28 Sep

06:01 - 06:55

STL

SYD

33h 54m

2 stops

10:20 - 17:59

SYD

STL

22h 39m

1 stop

$1,767United Airlines

Sat, 1 Aug - Sun, 23 Aug

13:18 - 06:55

STL

SYD

26h 37m

2 stops

09:30 - 16:34

SYD

STL

22h 04m

2 stops

$1,773United Airlines

Sat, 1 Aug - Sun, 23 Aug

06:37 - 07:05

STL

SYD

33h 28m

1 stop

17:50 - 22:59

SYD

STL

20h 09m

1 stop

$1,804American Airlines

Sat, 1 Aug - Sun, 23 Aug

15:35 - 06:55

STL

SYD

24h 20m

1 stop

12:00 - 18:05

SYD

STL

21h 05m

1 stop

$1,809Qantas Airways

Thu, 20 Aug - Thu, 27 Aug

15:59 - 06:55

STL

SYD

21h 56m

1 stop

17:45 - 23:42

SYD

STL

46h 57m

2 stops

$1,822Qantas Airways

Wed, 4 Nov - Wed, 11 Nov

08:42 - 06:55

STL

SYD

31h 13m

1 stop

09:30 - 12:40

SYD

STL

42h 10m

2 stops

$1,832United Airlines

Fri, 28 Aug - Thu, 24 Sep

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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

20 Aug

STL15:35Lambert-St Louis

24h 20m

1 stop

SYD06:55Sydney Kingsford Smith

27 Aug

SYD12:00Sydney Kingsford Smith

21h 05m

1 stop

STL18:05Lambert-St Louis

$1,809

Qantas Airways

4 Nov

STL15:59Lambert-St Louis

21h 56m

1 stop

SYD06:55Sydney Kingsford Smith

11 Nov

SYD17:45Sydney Kingsford Smith

46h 57m

2 stops

STL23:42Lambert-St Louis

$1,822

Qantas Airways

16 Oct

STL15:20Lambert-St Louis

23h 35m

1 stop

SYD06:55Sydney Kingsford Smith

25 Oct

SYD14:55Sydney Kingsford Smith

48h 51m

2 stops

STL23:46Lambert-St Louis

$1,836

United Airlines flights from St. Louis to Sydney

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

United Airlines

19 July

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

2 Aug

SYD10:20Sydney Kingsford Smith

22h 57m

1 stop

STL18:17Lambert-St Louis

$1,684

United Airlines

30 Aug

STL15:32Lambert-St Louis

24h 28m

2 stops

SYD07:00Sydney Kingsford Smith

28 Sept

SYD10:20Sydney Kingsford Smith

21h 17m

2 stops

STL16:37Lambert-St Louis

$1,687

United Airlines

30 Aug

STL08:42Lambert-St Louis

31h 13m

1 stop

SYD06:55Sydney Kingsford Smith

13 Oct

SYD10:30Sydney Kingsford Smith

24h 13m

2 stops

STL18:43Lambert-St Louis

$1,694

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 30/8

15:32-07:00

2 stops24h 28m

Sydney Kingsford Smith

Mon 28/9

10:20-18:43

1 stop23h 23m

$1,687

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 30/8

08:42-06:55

1 stop31h 13m

Sydney Kingsford Smith

Mon 28/9

10:20-18:43

1 stop23h 23m

$1,694

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/8

16:40-07:00

2 stops23h 20m

Sydney Kingsford Smith

Wed 30/9

10:20-16:37

2 stops21h 17m

$1,760

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/8

08:42-06:55

1 stop31h 13m

Sydney Kingsford Smith

Mon 28/9

10:20-18:43

1 stop23h 23m

$1,766

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 1/8

06:01-06:55

2 stops33h 54m

Sydney Kingsford Smith

Sun 23/8

10:20-17:59

1 stop22h 39m

$1,767

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 1/8

13:18-06:55

2 stops26h 37m

Sydney Kingsford Smith

Sun 23/8

09:30-16:34

2 stops22h 04m

$1,773

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 1/8

06:37-07:05

1 stop33h 28m

Sydney Kingsford Smith

Sun 23/8

17:50-22:59

1 stop20h 09m

$1,804

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 20/8

15:35-06:55

1 stop24h 20m

Sydney Kingsford Smith

Thu 27/8

12:00-18:05

1 stop21h 05m

$1,809

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 4/11

15:59-06:55

1 stop21h 56m

Sydney Kingsford Smith

Wed 11/11

17:45-23:42

2 stops46h 57m

$1,822

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/8

08:42-06:55

1 stop31h 13m

Sydney Kingsford Smith

Thu 24/9

09:30-12:40

2 stops42h 10m

$1,832

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 $1,659. 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 $1,792.

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	20h 32m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 20h 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 20h 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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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.