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

United Airlines 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.

$847 Cheap Flights from St. Louis to Sydney in 2026

Q: What is the typical price of a round-trip flight between St. Louis and Sydney?

Prices are currently low for flights on this route. Typical prices usually range from $1,753 to $2,039. The lowest price recently found on this route was $1,585.

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 - 10:55

STL

SYD

37h 55m

2 stops

12:00 - 18:04

SYD

STL

21h 04m

1 stop

$1,585Qantas Airways

Tue, 1 Sep - Mon, 21 Sep

08:55 - 07:20

STL

SYD

31h 25m

2 stops

10:20 - 18:41

SYD

STL

24h 21m

2 stops

$1,592Air Canada

Wed, 23 Sep - Wed, 7 Oct

06:00 - 07:05

STL

SYD

34h 05m

1 stop

09:10 - 23:30

SYD

STL

29h 20m

1 stop

$1,596Qantas Airways

Tue, 1 Sep - Mon, 21 Sep

08:00 - 07:20

STL

SYD

32h 20m

3 stops

10:20 - 12:13

SYD

STL

41h 53m

3 stops

$1,601Air Canada

Wed, 23 Sep - Wed, 7 Oct

08:55 - 07:20

STL

SYD

31h 25m

2 stops

10:20 - 18:41

SYD

STL

48h 21m

3 stops

$1,604Air Canada

Wed, 23 Sep - Wed, 7 Oct

12:47 - 06:55

STL

SYD

26h 08m

1 stop

14:05 - 18:15

SYD

STL

21h 10m

1 stop

$1,626Qantas Airways

Tue, 13 Oct - Wed, 18 Nov

10:16 - 06:55

STL

SYD

29h 39m

1 stop

12:00 - 18:04

SYD

STL

21h 04m

1 stop

$1,641Qantas Airways

Mon, 7 Sep - Mon, 14 Sep

10:16 - 06:55

STL

SYD

29h 39m

1 stop

09:10 - 23:30

SYD

STL

29h 20m

1 stop

$1,642Qantas Airways

Mon, 7 Sep - Mon, 14 Sep

16:39 - 08:20

STL

SYD

23h 41m

2 stops

11:20 - 12:06

SYD

STL

41h 46m

3 stops

$1,644Air Canada

Tue, 13 Oct - Fri, 13 Nov

10:16 - 06:55

STL

SYD

29h 39m

1 stop

17:50 - 23:30

SYD

STL

20h 40m

1 stop

$1,645Qantas Airways

Mon, 7 Sep - Sun, 27 Sep

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Air Canada flights from St. Louis to Sydney

Our best Air Canada deals on St. Louis to Sydney flight tickets

Air Canada

23 Sept

STL08:55Lambert-St Louis

31h 25m

2 stops

SYD07:20Sydney Kingsford Smith

7 Oct

SYD10:20Sydney Kingsford Smith

24h 21m

2 stops

STL18:41Lambert-St Louis

$1,592

Air Canada

17 Nov

STL16:05Lambert-St Louis

48h 30m

2 stops

SYD09:35Sydney Kingsford Smith

25 Nov

SYD11:20Sydney Kingsford Smith

45h 06m

2 stops

STL15:26Lambert-St Louis

$1,599

Air Canada

23 Sept

STL08:00Lambert-St Louis

32h 20m

3 stops

SYD07:20Sydney Kingsford Smith

7 Oct

SYD10:20Sydney Kingsford Smith

41h 53m

3 stops

STL12:13Lambert-St Louis

$1,601

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

1 Sept

STL06:00Lambert-St Louis

37h 55m

2 stops

SYD10:55Sydney Kingsford Smith

21 Sept

SYD12:00Sydney Kingsford Smith

21h 04m

1 stop

STL18:04Lambert-St Louis

$1,585

Qantas Airways

1 Sept

STL06:00Lambert-St Louis

34h 05m

1 stop

SYD07:05Sydney Kingsford Smith

21 Sept

SYD09:10Sydney Kingsford Smith

29h 20m

1 stop

STL23:30Lambert-St Louis

$1,596

Qantas Airways

13 Oct

STL12:47Lambert-St Louis

26h 08m

1 stop

SYD06:55Sydney Kingsford Smith

18 Nov

SYD14:05Sydney Kingsford Smith

21h 10m

1 stop

STL18:15Lambert-St Louis

$1,626

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 1/9

06:00-10:55

2 stops37h 55m

Sydney Kingsford Smith

Mon 21/9

12:00-18:04

1 stop21h 04m

$1,585

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 23/9

08:55-07:20

2 stops31h 25m

Sydney Kingsford Smith

Wed 7/10

10:20-18:41

2 stops24h 21m

$1,592

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 1/9

06:00-07:05

1 stop34h 05m

Sydney Kingsford Smith

Mon 21/9

09:10-23:30

1 stop29h 20m

$1,596

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 23/9

08:00-07:20

3 stops32h 20m

Sydney Kingsford Smith

Wed 7/10

10:20-12:13

3 stops41h 53m

$1,601

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 23/9

08:55-07:20

2 stops31h 25m

Sydney Kingsford Smith

Wed 7/10

10:20-18:41

3 stops48h 21m

$1,604

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 13/10

12:47-06:55

1 stop26h 08m

Sydney Kingsford Smith

Wed 18/11

14:05-18:15

1 stop21h 10m

$1,626

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 7/9

10:16-06:55

1 stop29h 39m

Sydney Kingsford Smith

Mon 14/9

12:00-18:04

1 stop21h 04m

$1,641

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 7/9

10:16-06:55

1 stop29h 39m

Sydney Kingsford Smith

Mon 14/9

09:10-23:30

1 stop29h 20m

$1,642

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 13/10

16:39-08:20

2 stops23h 41m

Sydney Kingsford Smith

Fri 13/11

11:20-12:06

3 stops41h 46m

$1,644

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 7/9

10:16-06:55

1 stop29h 39m

Sydney Kingsford Smith

Sun 27/9

17:50-23:30

1 stop20h 40m

$1,645

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 typical price of a round-trip flight between St. Louis and Sydney?

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 $1,656. 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 $1,789.

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	21h 14m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 21h 14m

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 14m.
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.