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

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.

$930 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 $2,151 to $1,768. The lowest price recently found on this route was $1,307.

1 adult

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Find the cheapest flights from St. Louis to Sydney

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18:13 - 20:50

STL

SYD

33h 37m

2 stops

11:15 - 23:42

SYD

STL

29h 27m

1 stop

$1,307Qantas Airways

Sun, 1 Nov - Sat, 14 Nov

07:00 - 09:00

STL

SYD

33h 00m

1 stop

17:50 - 12:37

SYD

STL

35h 47m

2 stops

$1,514Qantas Airways

Sat, 7 Nov - Thu, 12 Nov

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,603Air New Zealand

Wed, 22 Jul - Sun, 30 Aug

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 18:17

SYD

STL

22h 57m

1 stop

$1,604United Airlines

Wed, 22 Jul - Sun, 2 Aug

07:00 - 09:00

STL

SYD

33h 00m

1 stop

08:55 - 15:29

SYD

STL

47h 34m

2 stops

$1,608Qantas Airways

Sat, 7 Nov - Sat, 14 Nov

13:38 - 07:00

STL

SYD

26h 22m

2 stops

10:20 - 18:17

SYD

STL

22h 57m

1 stop

$1,609Air New Zealand

Sun, 7 Jun - Sun, 14 Jun

09:15 - 07:00

STL

SYD

30h 45m

2 stops

10:20 - 21:02

SYD

STL

25h 42m

2 stops

$1,611United Airlines

Tue, 21 Jul - Sun, 30 Aug

05:10 - 07:00

STL

SYD

34h 50m

2 stops

09:30 - 20:29

SYD

STL

25h 59m

2 stops

$1,630United Airlines

Wed, 22 Jul - Sun, 30 Aug

08:55 - 07:20

STL

SYD

31h 25m

2 stops

09:20 - 18:42

SYD

STL

24h 22m

2 stops

$1,652Air Canada

Wed, 22 Jul - Wed, 29 Jul

08:55 - 07:20

STL

SYD

31h 25m

2 stops

09:20 - 18:42

SYD

STL

48h 22m

3 stops

$1,665Air Canada

Wed, 22 Jul - Wed, 29 Jul

Air Canada flights from St. Louis to Sydney

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

Air Canada

22 July

STL08:55Lambert-St Louis

31h 25m

2 stops

SYD07:20Sydney Kingsford Smith

29 July

SYD09:20Sydney Kingsford Smith

24h 22m

2 stops

STL18:42Lambert-St Louis

$1,652

Air Canada

22 July

STL08:55Lambert-St Louis

31h 25m

2 stops

SYD07:20Sydney Kingsford Smith

29 July

SYD09:20Sydney Kingsford Smith

48h 22m

3 stops

STL18:42Lambert-St Louis

$1,665

Air Canada

17 May

STL07:05Lambert-St Louis

33h 15m

2 stops

SYD07:20Sydney Kingsford Smith

24 May

SYD09:20Sydney Kingsford Smith

22h 13m

2 stops

STL16:33Lambert-St Louis

$1,676

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

1 Nov

STL18:13Lambert-St Louis

33h 37m

2 stops

SYD20:50Sydney Kingsford Smith

14 Nov

SYD11:15Sydney Kingsford Smith

29h 27m

1 stop

STL23:42Lambert-St Louis

$1,307

Qantas Airways

7 Nov

STL07:00Lambert-St Louis

33h 00m

1 stop

SYD09:00Sydney Kingsford Smith

12 Nov

SYD17:50Sydney Kingsford Smith

35h 47m

2 stops

STL12:37Lambert-St Louis

$1,514

Qantas Airways

7 Nov

STL07:00Lambert-St Louis

33h 00m

1 stop

SYD09:00Sydney Kingsford Smith

14 Nov

SYD08:55Sydney Kingsford Smith

47h 34m

2 stops

STL15:29Lambert-St Louis

$1,608

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/11

18:13-20:50

2 stops33h 37m

Sydney Kingsford Smith

Sat 14/11

11:15-23:42

1 stop29h 27m

$1,307

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 7/11

07:00-09:00

1 stop33h 00m

Sydney Kingsford Smith

Thu 12/11

17:50-12:37

2 stops35h 47m

$1,514

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/7

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Sun 30/8

10:20-18:39

1 stop23h 19m

$1,603

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/7

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Sun 2/8

10:20-18:17

1 stop22h 57m

$1,604

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 7/11

07:00-09:00

1 stop33h 00m

Sydney Kingsford Smith

Sat 14/11

08:55-15:29

2 stops47h 34m

$1,608

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 7/6

13:38-07:00

2 stops26h 22m

Sydney Kingsford Smith

Sun 14/6

10:20-18:17

1 stop22h 57m

$1,609

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 21/7

09:15-07:00

2 stops30h 45m

Sydney Kingsford Smith

Sun 30/8

10:20-21:02

2 stops25h 42m

$1,611

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/7

05:10-07:00

2 stops34h 50m

Sydney Kingsford Smith

Sun 30/8

09:30-20:29

2 stops25h 59m

$1,630

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/7

08:55-07:20

2 stops31h 25m

Sydney Kingsford Smith

Wed 29/7

09:20-18:42

2 stops24h 22m

$1,652

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/7

08:55-07:20

2 stops31h 25m

Sydney Kingsford Smith

Wed 29/7

09:20-18:42

3 stops48h 22m

$1,665

Flights are sorted by cheapest return flights first.

Showing 1-10 of 13 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 $1,703. 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 $1,710.

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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Lithgow

Manly

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Cronulla

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Swansea

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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.