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

Delta, United Airlines, and American 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.

$794 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 - 07:30

STL

SYD

34h 30m

1 stop

09:10 - 22:59

SYD

STL

28h 49m

1 stop

$1,667Qantas Airways

Mon, 10 Aug - Mon, 17 Aug

08:42 - 06:55

STL

SYD

31h 13m

1 stop

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,705Air New Zealand

Wed, 12 Aug - Wed, 19 Aug

16:48 - 07:00

STL

SYD

23h 12m

2 stops

09:30 - 19:16

SYD

STL

24h 46m

2 stops

$1,708Air New Zealand

Mon, 10 Aug - Mon, 17 Aug

16:40 - 06:55

STL

SYD

23h 15m

2 stops

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,711Air New Zealand

Wed, 12 Aug - Wed, 19 Aug

08:42 - 06:55

STL

SYD

31h 13m

1 stop

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,719Air New Zealand

Wed, 12 Aug - Wed, 19 Aug

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,721United Airlines

Mon, 10 Aug - Wed, 19 Aug

15:24 - 07:00

STL

SYD

24h 36m

2 stops

10:20 - 16:34

SYD

STL

21h 14m

2 stops

$1,725Air New Zealand

Tue, 11 Aug - Wed, 19 Aug

13:38 - 07:00

STL

SYD

26h 22m

2 stops

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,727United Airlines

Mon, 10 Aug - Mon, 17 Aug

05:10 - 07:00

STL

SYD

34h 50m

2 stops

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,728United Airlines

Sun, 9 Aug - Sun, 16 Aug

06:00 - 07:05

STL

SYD

34h 05m

1 stop

09:10 - 18:05

SYD

STL

23h 55m

2 stops

$1,734American Airlines

Mon, 10 Aug - Mon, 17 Aug

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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

10 Aug

STL06:00Lambert-St Louis

34h 30m

1 stop

SYD07:30Sydney Kingsford Smith

17 Aug

SYD09:10Sydney Kingsford Smith

28h 49m

1 stop

STL22:59Lambert-St Louis

$1,667

Qantas Airways

31 Aug

STL06:00Lambert-St Louis

34h 05m

1 stop

SYD07:05Sydney Kingsford Smith

14 Sept

SYD09:10Sydney Kingsford Smith

29h 30m

1 stop

STL23:40Lambert-St Louis

$1,772

Qantas Airways

9 Aug

STL06:00Lambert-St Louis

34h 30m

1 stop

SYD07:30Sydney Kingsford Smith

16 Aug

SYD09:10Sydney Kingsford Smith

28h 49m

1 stop

STL22:59Lambert-St Louis

$1,786

American Airlines flights from St. Louis to Sydney

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

American Airlines

10 Aug

STL06:00Lambert-St Louis

34h 05m

1 stop

SYD07:05Sydney Kingsford Smith

17 Aug

SYD09:10Sydney Kingsford Smith

23h 55m

2 stops

STL18:05Lambert-St Louis

$1,734

American Airlines

21 July

STL09:44Lambert-St Louis

30h 11m

1 stop

SYD06:55Sydney Kingsford Smith

28 July

SYD17:50Sydney Kingsford Smith

21h 09m

1 stop

STL23:59Lambert-St Louis

$1,746

American Airlines

21 July

STL14:32Lambert-St Louis

25h 23m

2 stops

SYD06:55Sydney Kingsford Smith

28 July

SYD09:10Sydney Kingsford Smith

25h 43m

2 stops

STL19:53Lambert-St Louis

$1,751

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

06:00-07:30

1 stop34h 30m

Sydney Kingsford Smith

Mon 17/8

09:10-22:59

1 stop28h 49m

$1,667

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

08:42-06:55

1 stop31h 13m

Sydney Kingsford Smith

Wed 19/8

10:20-18:39

1 stop23h 19m

$1,705

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

16:48-07:00

2 stops23h 12m

Sydney Kingsford Smith

Mon 17/8

09:30-19:16

2 stops24h 46m

$1,708

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

16:40-06:55

2 stops23h 15m

Sydney Kingsford Smith

Wed 19/8

10:20-18:39

1 stop23h 19m

$1,711

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

08:42-06:55

1 stop31h 13m

Sydney Kingsford Smith

Wed 19/8

10:20-18:39

1 stop23h 19m

$1,719

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Wed 19/8

10:20-18:39

1 stop23h 19m

$1,721

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 11/8

15:24-07:00

2 stops24h 36m

Sydney Kingsford Smith

Wed 19/8

10:20-16:34

2 stops21h 14m

$1,725

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

13:38-07:00

2 stops26h 22m

Sydney Kingsford Smith

Mon 17/8

10:20-18:39

1 stop23h 19m

$1,727

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 9/8

05:10-07:00

2 stops34h 50m

Sydney Kingsford Smith

Sun 16/8

10:20-18:39

1 stop23h 19m

$1,728

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

06:00-07:05

1 stop34h 05m

Sydney Kingsford Smith

Mon 17/8

09:10-18:05

2 stops23h 55m

$1,734

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 $1,820. 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 $1,892.

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 31m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 20h 31m

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 31m.
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.