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

Qantas Airways, Singapore Airlines, and Air New Zealand 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.

$995 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 $2,334 to $1,851. The lowest price recently found on this route was $1,528.

Find the cheapest flights from St. Louis to Sydney

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

18:13 - 20:50

STL

SYD

33h 37m

2 stops

11:15 - 23:42

SYD

STL

29h 27m

1 stop

$1,528Qantas Airways

Sun, 15 Nov - Wed, 25 Nov

18:13 - 20:50

STL

SYD

33h 37m

2 stops

11:15 - 23:57

SYD

STL

29h 42m

1 stop

$1,670Qantas Airways

Tue, 1 Dec - Tue, 15 Dec

12:10 - 07:20

STL

SYD

52h 10m

2 stops

09:20 - 18:42

SYD

STL

48h 22m

2 stops

$1,690Air Canada

Sat, 8 Aug - Sun, 16 Aug

12:10 - 07:20

STL

SYD

52h 10m

3 stops

09:20 - 18:42

SYD

STL

48h 22m

2 stops

$1,701Air Canada

Sat, 8 Aug - Sun, 16 Aug

07:00 - 09:00

STL

SYD

33h 00m

1 stop

17:50 - 12:37

SYD

STL

35h 47m

2 stops

$1,873Qantas Airways

Fri, 6 Nov - Sat, 14 Nov

06:30 - 12:25

STL

SYD

37h 55m

2 stops

19:40 - 23:42

SYD

STL

45h 02m

2 stops

$1,886Qantas Airways

Tue, 13 Oct - Fri, 13 Nov

06:30 - 09:45

STL

SYD

35h 15m

2 stops

07:00 - 23:42

SYD

STL

57h 42m

2 stops

$1,888Qantas Airways

Tue, 13 Oct - Fri, 13 Nov

06:00 - 13:55

STL

SYD

40h 55m

2 stops

22:00 - 23:40

SYD

STL

40h 40m

2 stops

$1,900Qantas Airways

Thu, 3 Sep - Thu, 17 Sep

16:48 - 07:20

STL

SYD

23h 32m

2 stops

09:20 - 21:26

SYD

STL

51h 06m

3 stops

$1,915Air Canada

Mon, 20 Jul - Tue, 28 Jul

06:00 - 12:15

STL

SYD

39h 15m

2 stops

06:25 - 22:59

SYD

STL

31h 34m

2 stops

$1,921Qantas Airways

Sat, 8 Aug - Sat, 15 Aug

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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

2 July

STL16:48Lambert-St Louis

23h 12m

2 stops

SYD07:00Sydney Kingsford Smith

12 July

SYD10:20Sydney Kingsford Smith

22h 57m

1 stop

STL18:17Lambert-St Louis

$1,959

United Airlines

8 Aug

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

16 Aug

SYD10:20Sydney Kingsford Smith

23h 19m

1 stop

STL18:39Lambert-St Louis

$1,961

United Airlines

3 July

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

10 July

SYD10:20Sydney Kingsford Smith

22h 57m

1 stop

STL18:17Lambert-St Louis

$2,019

Air Canada flights from St. Louis to Sydney

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

Air Canada

8 Aug

STL12:10Lambert-St Louis

52h 10m

2 stops

SYD07:20Sydney Kingsford Smith

16 Aug

SYD09:20Sydney Kingsford Smith

48h 22m

2 stops

STL18:42Lambert-St Louis

$1,690

Air Canada

8 Aug

STL12:10Lambert-St Louis

52h 10m

3 stops

SYD07:20Sydney Kingsford Smith

16 Aug

SYD09:20Sydney Kingsford Smith

48h 22m

2 stops

STL18:42Lambert-St Louis

$1,701

Air Canada

20 July

STL16:48Lambert-St Louis

23h 32m

2 stops

SYD07:20Sydney Kingsford Smith

28 July

SYD09:20Sydney Kingsford Smith

51h 06m

3 stops

STL21:26Lambert-St Louis

$1,915

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 15/11

18:13-20:50

2 stops33h 37m

Sydney Kingsford Smith

Wed 25/11

11:15-23:42

1 stop29h 27m

$1,528

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 1/12

18:13-20:50

2 stops33h 37m

Sydney Kingsford Smith

Tue 15/12

11:15-23:57

1 stop29h 42m

$1,670

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 8/8

12:10-07:20

2 stops52h 10m

Sydney Kingsford Smith

Sun 16/8

09:20-18:42

2 stops48h 22m

$1,690

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 8/8

12:10-07:20

3 stops52h 10m

Sydney Kingsford Smith

Sun 16/8

09:20-18:42

2 stops48h 22m

$1,701

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 6/11

07:00-09:00

1 stop33h 00m

Sydney Kingsford Smith

Sat 14/11

17:50-12:37

2 stops35h 47m

$1,873

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 13/10

06:30-12:25

2 stops37h 55m

Sydney Kingsford Smith

Fri 13/11

19:40-23:42

2 stops45h 02m

$1,886

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 13/10

06:30-09:45

2 stops35h 15m

Sydney Kingsford Smith

Fri 13/11

07:00-23:42

2 stops57h 42m

$1,888

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 3/9

06:00-13:55

2 stops40h 55m

Sydney Kingsford Smith

Thu 17/9

22:00-23:40

2 stops40h 40m

$1,900

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 20/7

16:48-07:20

2 stops23h 32m

Sydney Kingsford Smith

Tue 28/7

09:20-21:26

3 stops51h 06m

$1,915

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 8/8

06:00-12:15

2 stops39h 15m

Sydney Kingsford Smith

Sat 15/8

06:25-22:59

2 stops31h 34m

$1,921

Flights are sorted by cheapest return flights first.

Showing 1-10 of 19 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 March is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $1,751. If you aren’t able to travel to Sydney during the month of March, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $1,751.

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.

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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.