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

United 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.

$705 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 $2,566 to $1,782. The lowest price recently found on this route was $1,792.

1 adult

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Find the cheapest flights from St. Louis to Sydney

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One-way

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Cheap return flights

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06:30 - 09:00

STL

SYD

34h 30m

1 stop

17:50 - 12:37

SYD

STL

35h 47m

2 stops

$1,792Qantas Airways

Sat, 24 Oct - Mon, 2 Nov

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 18:17

SYD

STL

22h 57m

1 stop

$1,814United Airlines

Mon, 1 Jun - Wed, 10 Jun

16:48 - 07:00

STL

SYD

23h 12m

2 stops

10:20 - 18:17

SYD

STL

22h 57m

1 stop

$1,816United Airlines

Wed, 27 May - Wed, 3 Jun

14:57 - 07:00

STL

SYD

25h 03m

2 stops

09:30 - 16:33

SYD

STL

22h 03m

2 stops

$1,821United Airlines

Wed, 27 May - Wed, 3 Jun

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 18:17

SYD

STL

22h 57m

1 stop

$1,888Air New Zealand

Tue, 9 Jun - Tue, 16 Jun

16:48 - 07:00

STL

SYD

23h 12m

2 stops

09:30 - 20:43

SYD

STL

26h 13m

2 stops

$1,916United Airlines

Wed, 3 Jun - Fri, 19 Jun

18:51 - 06:55

STL

SYD

21h 04m

1 stop

13:00 - 16:42

SYD

STL

19h 42m

1 stop

$1,927Qantas Airways

Wed, 23 Sep - Wed, 7 Oct

13:05 - 07:20

STL

SYD

51h 15m

3 stops

09:20 - 18:17

SYD

STL

23h 57m

2 stops

$1,929Multiple Airlines

Wed, 27 May - Wed, 3 Jun

06:35 - 09:35

STL

SYD

36h 00m

2 stops

12:00 - 16:28

SYD

STL

19h 28m

1 stop

$1,936Qantas Airways

Wed, 1 Jul - Sun, 12 Jul

13:05 - 07:20

STL

SYD

51h 15m

3 stops

09:20 - 12:06

SYD

STL

41h 46m

2 stops

$1,942Air Canada

Tue, 9 Jun - Tue, 16 Jun

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

24 Oct

STL06:30Lambert-St Louis

34h 30m

1 stop

SYD09:00Sydney Kingsford Smith

2 Nov

SYD17:50Sydney Kingsford Smith

35h 47m

2 stops

STL12:37Lambert-St Louis

$1,792

Qantas Airways

23 Sept

STL18:51Lambert-St Louis

21h 04m

1 stop

SYD06:55Sydney Kingsford Smith

7 Oct

SYD13:00Sydney Kingsford Smith

19h 42m

1 stop

STL16:42Lambert-St Louis

$1,927

Qantas Airways

1 July

STL06:35Lambert-St Louis

36h 00m

2 stops

SYD09:35Sydney Kingsford Smith

12 July

SYD12:00Sydney Kingsford Smith

19h 28m

1 stop

STL16:28Lambert-St Louis

$1,936

Air Canada flights from St. Louis to Sydney

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

Air Canada

9 June

STL13:05Lambert-St Louis

51h 15m

3 stops

SYD07:20Sydney Kingsford Smith

16 June

SYD09:20Sydney Kingsford Smith

41h 46m

2 stops

STL12:06Lambert-St Louis

$1,942

Air Canada

15 Oct

STL12:10Lambert-St Louis

52h 10m

2 stops

SYD08:20Sydney Kingsford Smith

22 Oct

SYD10:20Sydney Kingsford Smith

48h 21m

2 stops

STL18:41Lambert-St Louis

$1,977

Air Canada

8 May

STL14:35Lambert-St Louis

25h 45m

2 stops

SYD07:20Sydney Kingsford Smith

22 May

SYD09:20Sydney Kingsford Smith

29h 37m

2 stops

STL23:57Lambert-St Louis

$1,979

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 24/10

06:30-09:00

1 stop34h 30m

Sydney Kingsford Smith

Mon 2/11

17:50-12:37

2 stops35h 47m

$1,792

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 1/6

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Wed 10/6

10:20-18:17

1 stop22h 57m

$1,814

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 27/5

16:48-07:00

2 stops23h 12m

Sydney Kingsford Smith

Wed 3/6

10:20-18:17

1 stop22h 57m

$1,816

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 27/5

14:57-07:00

2 stops25h 03m

Sydney Kingsford Smith

Wed 3/6

09:30-16:33

2 stops22h 03m

$1,821

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 9/6

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Tue 16/6

10:20-18:17

1 stop22h 57m

$1,888

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 3/6

16:48-07:00

2 stops23h 12m

Sydney Kingsford Smith

Fri 19/6

09:30-20:43

2 stops26h 13m

$1,916

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 23/9

18:51-06:55

1 stop21h 04m

Sydney Kingsford Smith

Wed 7/10

13:00-16:42

1 stop19h 42m

$1,927

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 27/5

13:05-07:20

3 stops51h 15m

Sydney Kingsford Smith

Wed 3/6

09:20-18:17

2 stops23h 57m

$1,929

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 1/7

06:35-09:35

2 stops36h 00m

Sydney Kingsford Smith

Sun 12/7

12:00-16:28

1 stop19h 28m

$1,936

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 9/6

13:05-07:20

3 stops51h 15m

Sydney Kingsford Smith

Tue 16/6

09:20-12:06

2 stops41h 46m

$1,942

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 $1,717. 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 $1,802.

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 49m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 20h 49m

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 49m.
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.