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

Air Canada and ANA 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.

$704 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 $2,310 to $1,894. The lowest price recently found on this route was $1,657.

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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.

05:10 - 07:20

STL

SYD

35h 10m

2 stops

09:20 - 12:40

SYD

STL

42h 20m

2 stops

$1,657Air Canada

Mon, 14 Sep - Fri, 18 Sep

12:10 - 07:20

STL

SYD

28h 10m

2 stops

09:20 - 18:41

SYD

STL

48h 21m

2 stops

$1,667Air Canada

Fri, 18 Sep - Thu, 24 Sep

12:10 - 07:20

STL

SYD

28h 10m

2 stops

09:20 - 18:41

SYD

STL

48h 21m

3 stops

$1,676Air Canada

Mon, 14 Sep - Fri, 18 Sep

12:10 - 07:20

STL

SYD

28h 10m

2 stops

09:20 - 18:41

SYD

STL

48h 21m

3 stops

$1,679Air Canada

Fri, 18 Sep - Thu, 24 Sep

12:10 - 07:20

STL

SYD

52h 10m

3 stops

09:20 - 18:41

SYD

STL

48h 21m

3 stops

$1,687Air Canada

Mon, 14 Sep - Fri, 18 Sep

16:05 - 07:20

STL

SYD

48h 15m

2 stops

09:20 - 20:25

SYD

STL

26h 05m

2 stops

$1,703Air Canada

Sun, 26 Apr - Sun, 10 May

05:10 - 07:20

STL

SYD

35h 10m

2 stops

09:20 - 14:00

SYD

STL

43h 40m

2 stops

$1,706Air Canada

Mon, 7 Sep - Mon, 14 Sep

12:10 - 07:20

STL

SYD

28h 10m

2 stops

09:20 - 20:00

SYD

STL

25h 40m

1 stop

$1,724Multiple Airlines

Fri, 18 Sep - Thu, 24 Sep

13:05 - 07:20

STL

SYD

51h 15m

2 stops

09:20 - 20:25

SYD

STL

26h 05m

2 stops

$1,726Air Canada

Mon, 4 May - Mon, 18 May

17:32 - 07:20

STL

SYD

46h 48m

1 stop

09:20 - 14:00

SYD

STL

43h 40m

1 stop

$1,731Singapore Airlines

Fri, 18 Sep - Thu, 24 Sep

United Airlines flights from St. Louis to Sydney

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

United Airlines

26 Apr

STL19:05Lambert-St Louis

20h 50m

1 stop

SYD06:55Sydney Kingsford Smith

10 May

SYD10:20Sydney Kingsford Smith

25h 23m

2 stops

STL20:43Lambert-St Louis

$2,005

United Airlines

4 May

STL19:06Lambert-St Louis

20h 49m

1 stop

SYD06:55Sydney Kingsford Smith

18 May

SYD10:20Sydney Kingsford Smith

21h 37m

2 stops

STL16:57Lambert-St Louis

$2,013

Air Canada flights from St. Louis to Sydney

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

Air Canada

14 Sept

STL05:10Lambert-St Louis

35h 10m

2 stops

SYD07:20Sydney Kingsford Smith

18 Sept

SYD09:20Sydney Kingsford Smith

42h 20m

2 stops

STL12:40Lambert-St Louis

$1,657

Air Canada

18 Sept

STL12:10Lambert-St Louis

28h 10m

2 stops

SYD07:20Sydney Kingsford Smith

24 Sept

SYD09:20Sydney Kingsford Smith

48h 21m

2 stops

STL18:41Lambert-St Louis

$1,667

Air Canada

12 May

STL16:06Lambert-St Louis

24h 14m

2 stops

SYD07:20Sydney Kingsford Smith

24 May

SYD09:20Sydney Kingsford Smith

26h 23m

2 stops

STL20:43Lambert-St Louis

$1,669

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 14/9

05:10-07:20

2 stops35h 10m

Sydney Kingsford Smith

Fri 18/9

09:20-12:40

2 stops42h 20m

$1,657

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 18/9

12:10-07:20

2 stops28h 10m

Sydney Kingsford Smith

Thu 24/9

09:20-18:41

2 stops48h 21m

$1,667

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 14/9

12:10-07:20

2 stops28h 10m

Sydney Kingsford Smith

Fri 18/9

09:20-18:41

3 stops48h 21m

$1,676

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 18/9

12:10-07:20

2 stops28h 10m

Sydney Kingsford Smith

Thu 24/9

09:20-18:41

3 stops48h 21m

$1,679

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 14/9

12:10-07:20

3 stops52h 10m

Sydney Kingsford Smith

Fri 18/9

09:20-18:41

3 stops48h 21m

$1,687

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 26/4

16:05-07:20

2 stops48h 15m

Sydney Kingsford Smith

Sun 10/5

09:20-20:25

2 stops26h 05m

$1,703

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 7/9

05:10-07:20

2 stops35h 10m

Sydney Kingsford Smith

Mon 14/9

09:20-14:00

2 stops43h 40m

$1,706

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 18/9

12:10-07:20

2 stops28h 10m

Sydney Kingsford Smith

Thu 24/9

09:20-20:00

1 stop25h 40m

$1,724

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

13:05-07:20

2 stops51h 15m

Sydney Kingsford Smith

Mon 18/5

09:20-20:25

2 stops26h 05m

$1,726

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 18/9

17:32-07:20

1 stop46h 48m

Sydney Kingsford Smith

Thu 24/9

09:20-14:00

1 stop43h 40m

$1,731

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 $1,812. 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 $1,870.

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	21h 04m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 21h 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

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 21h 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.

Parramatta

Wollongong

Terrigal

Penrith

Katoomba

Lithgow

Manly

Coogee

Leura

Bondi Beach

Cronulla

Randwick

Charlestown

Newport

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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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.