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

ANA, Air Canada, 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.

$826 Cheap Flights from St. Louis to Sydney in 2025/26

1 adult

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Find the cheapest flights from St. Louis to Sydney

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07:00 - 09:50STL-SYD

33h 50m2 stops

14:05 - 16:32SYD-STL

19h 27m1 stop

$1,882Qantas Airways

Find Deal

Wed, 12 Nov - Sun, 23 Nov

07:00 - 10:55STL-SYD

34h 55m2 stops

14:05 - 16:32SYD-STL

19h 27m1 stop

$1,883Qantas Airways

Find Deal

Wed, 12 Nov - Sun, 23 Nov

11:42 - 06:55STL-SYD

26h 13m1 stop

14:05 - 16:32SYD-STL

19h 27m1 stop

$1,891Multiple Airlines

Find Deal

Wed, 12 Nov - Sun, 23 Nov

07:00 - 06:55STL-SYD

30h 55m1 stop

14:05 - 22:34SYD-STL

25h 29m1 stop

$1,892American Airlines

Find Deal

Wed, 12 Nov - Sun, 23 Nov

16:43 - 09:35STL-SYD

23h 52m2 stops

11:20 - 16:28SYD-STL

46h 08m2 stops

$1,894Air Canada

Find Deal

Wed, 26 Nov - Wed, 3 Dec

14:29 - 07:25STL-SYD

23h 56m2 stops

11:20 - 16:32SYD-STL

22h 12m2 stops

$1,897American Airlines

Find Deal

Wed, 12 Nov - Sun, 23 Nov

11:20 - 07:00STL-SYD

26h 40m1 stop

12:10 - 16:27SYD-STL

21h 17m1 stop

$1,907United Airlines

Find Deal

Mon, 1 Dec - Wed, 17 Dec

16:05 - 07:20STL-SYD

48h 15m2 stops

09:20 - 15:24SYD-STL

45h 04m2 stops

$1,916Air Canada

Find Deal

Sun, 19 Apr - Sat, 25 Apr

08:20 - 07:00STL-SYD

29h 40m1 stop

11:50 - 18:47SYD-STL

23h 57m1 stop

$1,991United Airlines

Find Deal

Thu, 13 Nov - Mon, 17 Nov

13:35 - 08:45STL-SYD

26h 10m3 stops

11:45 - 21:58SYD-STL

27h 13m2 stops

$2,279Multiple Airlines

Find Deal

Wed, 26 Nov - Wed, 3 Dec

Air Canada flights from St. Louis to Sydney

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

Air Canada

3 Nov

STL16:43Lambert-St Louis

47h 52m

2 stops

SYD09:35Sydney Kingsford Smith

10 Nov

SYD11:20Sydney Kingsford Smith

27h 34m

2 stops

STL21:54Lambert-St Louis

$1,892

Find similar

Air Canada

26 Nov

STL16:43Lambert-St Louis

23h 52m

2 stops

SYD09:35Sydney Kingsford Smith

3 Dec

SYD11:20Sydney Kingsford Smith

46h 08m

2 stops

STL16:28Lambert-St Louis

$1,894

Find similar

Air Canada

19 Apr

STL16:05Lambert-St Louis

48h 15m

2 stops

SYD07:20Sydney Kingsford Smith

25 Apr

SYD09:20Sydney Kingsford Smith

45h 04m

2 stops

STL15:24Lambert-St Louis

$1,916

Find similar

United Airlines flights from St. Louis to Sydney

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

United Airlines

1 Dec

STL11:20Lambert-St Louis

26h 40m

1 stop

SYD07:00Sydney Kingsford Smith

17 Dec

SYD12:10Sydney Kingsford Smith

21h 17m

1 stop

STL16:27Lambert-St Louis

$1,907

Find similar

United Airlines

2 Nov

STL17:29Lambert-St Louis

22h 46m

1 stop

SYD09:15Sydney Kingsford Smith

16 Nov

SYD11:50Sydney Kingsford Smith

23h 57m

1 stop

STL18:47Lambert-St Louis

$1,951

Find similar

United Airlines

13 Nov

STL08:20Lambert-St Louis

29h 40m

1 stop

SYD07:00Sydney Kingsford Smith

17 Nov

SYD11:50Sydney Kingsford Smith

23h 57m

1 stop

STL18:47Lambert-St Louis

$1,991

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/11

07:00-09:50

2 stops33h 50m

Sydney Kingsford Smith

Sun 23/11

14:05-16:32

1 stop19h 27m

$1,882

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/11

07:00-10:55

2 stops34h 55m

Sydney Kingsford Smith

Sun 23/11

14:05-16:32

1 stop19h 27m

$1,883

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/11

11:42-06:55

1 stop26h 13m

Sydney Kingsford Smith

Sun 23/11

14:05-16:32

1 stop19h 27m

$1,891

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/11

07:00-06:55

1 stop30h 55m

Sydney Kingsford Smith

Sun 23/11

14:05-22:34

1 stop25h 29m

$1,892

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 26/11

16:43-09:35

2 stops23h 52m

Sydney Kingsford Smith

Wed 3/12

11:20-16:28

2 stops46h 08m

$1,894

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/11

14:29-07:25

2 stops23h 56m

Sydney Kingsford Smith

Sun 23/11

11:20-16:32

2 stops22h 12m

$1,897

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 1/12

11:20-07:00

1 stop26h 40m

Sydney Kingsford Smith

Wed 17/12

12:10-16:27

1 stop21h 17m

$1,907

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 19/4

16:05-07:20

2 stops48h 15m

Sydney Kingsford Smith

Sat 25/4

09:20-15:24

2 stops45h 04m

$1,916

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 13/11

08:20-07:00

1 stop29h 40m

Sydney Kingsford Smith

Mon 17/11

11:50-18:47

1 stop23h 57m

$1,991

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 26/11

13:35-08:45

3 stops26h 10m

Sydney Kingsford Smith

Wed 3/12

11:45-21:58

2 stops27h 13m

$2,279

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 August is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $1,920. If you aren’t able to travel to Sydney during the month of August, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $2,018.

What is the cheapest time of day to depart on your flight to Sydney?

According to our data, the cheapest time of day to fly to Sydney is in the afternoon. momondo users have found flights departing from St. Louis to Sydney in the afternoon for as low as $1,900. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $2,674 on average. Flights to Sydney from St. Louis in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

How far in advance should I book a flight to Sydney?

You are more likely to see cheaper flights to Sydney from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $2,204 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from St. Louis for as low as $1,378 on momondo.

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

Direct flights	None

There are no direct flights from St. Louis to Sydney. There are no popular flight routes from St. Louis to Sydney.

Search flight deals

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 25m.
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.