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

Air New Zealand and Delta 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.

$772 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 $2,483 to $1,792. The lowest price recently found on this route was $1,818.

1 adult

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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.

08:30 - 06:55

STL

SYD

31h 25m

1 stop

10:20 - 18:22

SYD

STL

23h 02m

1 stop

$1,818United Airlines

Mon, 4 May - Mon, 18 May

10:50 - 06:50

STL

SYD

29h 00m

2 stops

09:15 - 21:09

SYD

STL

26h 54m

2 stops

$1,822Delta

Mon, 4 May - Mon, 18 May

16:44 - 07:00

STL

SYD

23h 16m

2 stops

09:30 - 16:39

SYD

STL

22h 09m

2 stops

$1,824United Airlines

Mon, 4 May - Mon, 18 May

19:06 - 06:55

STL

SYD

20h 49m

1 stop

09:30 - 21:13

SYD

STL

26h 43m

2 stops

$1,825United Airlines

Mon, 4 May - Mon, 18 May

18:11 - 06:55

STL

SYD

21h 44m

1 stop

17:50 - 23:59

SYD

STL

21h 09m

1 stop

$1,900Qantas Airways

Mon, 4 May - Mon, 18 May

13:19 - 06:55

STL

SYD

26h 36m

1 stop

12:00 - 16:33

SYD

STL

19h 33m

1 stop

$1,902Qantas Airways

Tue, 23 Jun - Tue, 30 Jun

17:11 - 06:55

STL

SYD

21h 44m

1 stop

14:05 - 16:40

SYD

STL

19h 35m

1 stop

$1,927Qantas Airways

Tue, 13 Oct - Wed, 18 Nov

15:35 - 06:55

STL

SYD

24h 20m

1 stop

12:00 - 18:14

SYD

STL

21h 14m

1 stop

$1,928Qantas Airways

Mon, 7 Sep - Mon, 14 Sep

15:35 - 06:55

STL

SYD

24h 20m

1 stop

17:50 - 22:55

SYD

STL

20h 05m

1 stop

$1,930Qantas Airways

Sun, 23 Aug - Tue, 1 Sep

06:35 - 10:55

STL

SYD

37h 20m

2 stops

12:00 - 16:33

SYD

STL

19h 33m

1 stop

$1,938Qantas Airways

Tue, 23 Jun - Tue, 30 Jun

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

4 May

STL18:11Lambert-St Louis

21h 44m

1 stop

SYD06:55Sydney Kingsford Smith

18 May

SYD17:50Sydney Kingsford Smith

21h 09m

1 stop

STL23:59Lambert-St Louis

$1,900

Qantas Airways

23 June

STL13:19Lambert-St Louis

26h 36m

1 stop

SYD06:55Sydney Kingsford Smith

30 June

SYD12:00Sydney Kingsford Smith

19h 33m

1 stop

STL16:33Lambert-St Louis

$1,902

Qantas Airways

13 Oct

STL17:11Lambert-St Louis

21h 44m

1 stop

SYD06:55Sydney Kingsford Smith

18 Nov

SYD14:05Sydney Kingsford Smith

19h 35m

1 stop

STL16:40Lambert-St Louis

$1,927

United Airlines flights from St. Louis to Sydney

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

United Airlines

4 May

STL08:30Lambert-St Louis

31h 25m

1 stop

SYD06:55Sydney Kingsford Smith

18 May

SYD10:20Sydney Kingsford Smith

23h 02m

1 stop

STL18:22Lambert-St Louis

$1,818

United Airlines

4 May

STL16:44Lambert-St Louis

23h 16m

2 stops

SYD07:00Sydney Kingsford Smith

18 May

SYD09:30Sydney Kingsford Smith

22h 09m

2 stops

STL16:39Lambert-St Louis

$1,824

United Airlines

4 May

STL19:06Lambert-St Louis

20h 49m

1 stop

SYD06:55Sydney Kingsford Smith

18 May

SYD09:30Sydney Kingsford Smith

26h 43m

2 stops

STL21:13Lambert-St Louis

$1,825

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

08:30-06:55

1 stop31h 25m

Sydney Kingsford Smith

Mon 18/5

10:20-18:22

1 stop23h 02m

$1,818

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

10:50-06:50

2 stops29h 00m

Sydney Kingsford Smith

Mon 18/5

09:15-21:09

2 stops26h 54m

$1,822

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

16:44-07:00

2 stops23h 16m

Sydney Kingsford Smith

Mon 18/5

09:30-16:39

2 stops22h 09m

$1,824

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

19:06-06:55

1 stop20h 49m

Sydney Kingsford Smith

Mon 18/5

09:30-21:13

2 stops26h 43m

$1,825

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

18:11-06:55

1 stop21h 44m

Sydney Kingsford Smith

Mon 18/5

17:50-23:59

1 stop21h 09m

$1,900

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 23/6

13:19-06:55

1 stop26h 36m

Sydney Kingsford Smith

Tue 30/6

12:00-16:33

1 stop19h 33m

$1,902

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 13/10

17:11-06:55

1 stop21h 44m

Sydney Kingsford Smith

Wed 18/11

14:05-16:40

1 stop19h 35m

$1,927

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 7/9

15:35-06:55

1 stop24h 20m

Sydney Kingsford Smith

Mon 14/9

12:00-18:14

1 stop21h 14m

$1,928

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 23/8

15:35-06:55

1 stop24h 20m

Sydney Kingsford Smith

Tue 1/9

17:50-22:55

1 stop20h 05m

$1,930

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 23/6

06:35-10:55

2 stops37h 20m

Sydney Kingsford Smith

Tue 30/6

12:00-16:33

1 stop19h 33m

$1,938

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 March is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $1,719. If you aren’t able to travel to Sydney during the month of March, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $1,804.

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 04m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 20h 04m

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 04m.
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 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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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.