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

Delta, United Airlines, and EVA Air 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.

$1,058 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 $2,243 to $1,811. The lowest price recently found on this route was $1,644.

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.

06:30 - 08:05

STL

SYD

33h 35m

1 stop

17:50 - 16:42

SYD

STL

38h 52m

2 stops

$1,644Qantas Airways

Tue, 20 Oct - Thu, 29 Oct

13:05 - 07:20

STL

SYD

27h 15m

2 stops

09:20 - 20:25

SYD

STL

26h 05m

2 stops

$1,668Air Canada

Wed, 3 Jun - Tue, 9 Jun

13:05 - 07:20

STL

SYD

27h 15m

2 stops

09:20 - 20:25

SYD

STL

50h 05m

2 stops

$1,670Air Canada

Sun, 14 Jun - Sun, 21 Jun

08:55 - 07:20

STL

SYD

31h 25m

2 stops

09:20 - 18:42

SYD

STL

48h 22m

2 stops

$1,676Air Canada

Wed, 22 Jul - Mon, 27 Jul

13:05 - 07:20

STL

SYD

27h 15m

2 stops

09:20 - 20:25

SYD

STL

50h 05m

3 stops

$1,679Air Canada

Wed, 3 Jun - Tue, 9 Jun

08:55 - 07:20

STL

SYD

31h 25m

2 stops

09:20 - 18:42

SYD

STL

48h 22m

3 stops

$1,689Air Canada

Wed, 22 Jul - Mon, 27 Jul

14:15 - 07:20

STL

SYD

26h 05m

2 stops

09:20 - 12:16

SYD

STL

41h 56m

2 stops

$1,697Air Canada

Wed, 3 Jun - Sun, 7 Jun

08:55 - 07:20

STL

SYD

31h 25m

1 stop

09:20 - 20:22

SYD

STL

26h 02m

1 stop

$1,708Multiple Airlines

Wed, 22 Jul - Mon, 27 Jul

13:05 - 07:20

STL

SYD

27h 15m

2 stops

09:20 - 20:25

SYD

STL

26h 05m

2 stops

$1,721Air Canada

Tue, 2 Jun - Fri, 5 Jun

12:10 - 07:20

STL

SYD

52h 10m

2 stops

09:20 - 18:42

SYD

STL

48h 22m

2 stops

$1,724Air Canada

Fri, 31 Jul - Sun, 9 Aug

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

20 Oct

STL06:30Lambert-St Louis

33h 35m

1 stop

SYD08:05Sydney Kingsford Smith

29 Oct

SYD17:50Sydney Kingsford Smith

38h 52m

2 stops

STL16:42Lambert-St Louis

$1,644

Qantas Airways

23 Sept

STL17:11Lambert-St Louis

23h 49m

2 stops

SYD08:00Sydney Kingsford Smith

7 Oct

SYD11:05Sydney Kingsford Smith

23h 09m

2 stops

STL18:14Lambert-St Louis

$1,813

Qantas Airways

23 Sept

STL17:11Lambert-St Louis

24h 04m

2 stops

SYD08:15Sydney Kingsford Smith

7 Oct

SYD10:30Sydney Kingsford Smith

23h 44m

2 stops

STL18:14Lambert-St Louis

$1,815

Air New Zealand flights from St. Louis to Sydney

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

Air New Zealand

26 May

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

10 June

SYD10:20Sydney Kingsford Smith

22h 57m

1 stop

STL18:17Lambert-St Louis

$1,867

Air New Zealand

16 June

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

23 June

SYD10:20Sydney Kingsford Smith

22h 57m

1 stop

STL18:17Lambert-St Louis

$1,868

Air New Zealand

10 June

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

17 June

SYD10:20Sydney Kingsford Smith

21h 13m

2 stops

STL16:33Lambert-St Louis

$1,874

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 20/10

06:30-08:05

1 stop33h 35m

Sydney Kingsford Smith

Thu 29/10

17:50-16:42

2 stops38h 52m

$1,644

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 3/6

13:05-07:20

2 stops27h 15m

Sydney Kingsford Smith

Tue 9/6

09:20-20:25

2 stops26h 05m

$1,668

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 14/6

13:05-07:20

2 stops27h 15m

Sydney Kingsford Smith

Sun 21/6

09:20-20:25

2 stops50h 05m

$1,670

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/7

08:55-07:20

2 stops31h 25m

Sydney Kingsford Smith

Mon 27/7

09:20-18:42

2 stops48h 22m

$1,676

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 3/6

13:05-07:20

2 stops27h 15m

Sydney Kingsford Smith

Tue 9/6

09:20-20:25

3 stops50h 05m

$1,679

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/7

08:55-07:20

2 stops31h 25m

Sydney Kingsford Smith

Mon 27/7

09:20-18:42

3 stops48h 22m

$1,689

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 3/6

14:15-07:20

2 stops26h 05m

Sydney Kingsford Smith

Sun 7/6

09:20-12:16

2 stops41h 56m

$1,697

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/7

08:55-07:20

1 stop31h 25m

Sydney Kingsford Smith

Mon 27/7

09:20-20:22

1 stop26h 02m

$1,708

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 2/6

13:05-07:20

2 stops27h 15m

Sydney Kingsford Smith

Fri 5/6

09:20-20:25

2 stops26h 05m

$1,721

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 31/7

12:10-07:20

2 stops52h 10m

Sydney Kingsford Smith

Sun 9/8

09:20-18:42

2 stops48h 22m

$1,724

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 $1,728. 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 $1,735.

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	23h 49m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 23h 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 23h 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.