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

United Airlines and Cathay Pacific 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.

$1,128 Cheap Flights from St. Louis to Sydney in 2026

Find the cheapest flights from St. Louis to Sydney

Return

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

19:22 - 06:55

STL

SYD

20h 33m

1 stop

17:50 - 22:59

SYD

STL

20h 09m

1 stop

$1,650Qantas Airways

Mon, 3 Aug - Mon, 10 Aug

06:00 - 07:30

STL

SYD

34h 30m

1 stop

09:10 - 22:59

SYD

STL

28h 49m

1 stop

$1,656Qantas Airways

Wed, 12 Aug - Sun, 30 Aug

16:48 - 07:00

STL

SYD

23h 12m

2 stops

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,708United Airlines

Mon, 10 Aug - Mon, 17 Aug

15:39 - 06:50

STL

SYD

24h 11m

2 stops

09:15 - 23:26

SYD

STL

29h 11m

2 stops

$1,714Delta

Mon, 10 Aug - Mon, 17 Aug

12:52 - 06:50

STL

SYD

26h 58m

2 stops

09:15 - 23:58

SYD

STL

29h 43m

2 stops

$1,715Delta

Wed, 12 Aug - Sun, 30 Aug

17:11 - 06:55

STL

SYD

22h 44m

1 stop

17:50 - 22:59

SYD

STL

20h 09m

1 stop

$1,719Qantas Airways

Sat, 22 Aug - Tue, 8 Sep

12:45 - 06:55

STL

SYD

27h 10m

1 stop

09:10 - 18:05

SYD

STL

23h 55m

2 stops

$1,728American Airlines

Wed, 12 Aug - Sun, 30 Aug

17:00 - 06:50

STL

SYD

46h 50m

2 stops

09:15 - 18:55

SYD

STL

24h 40m

2 stops

$1,735Delta

Sat, 8 Aug - Wed, 19 Aug

06:00 - 07:05

STL

SYD

34h 05m

1 stop

17:50 - 22:59

SYD

STL

20h 09m

1 stop

$1,745American Airlines

Mon, 10 Aug - Mon, 17 Aug

17:00 - 06:50

STL

SYD

46h 50m

2 stops

09:15 - 00:41

SYD

STL

54h 26m

2 stops

$1,758Delta

Sat, 8 Aug - Sun, 16 Aug

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Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

3 Aug

STL19:22Lambert-St Louis

20h 33m

1 stop

SYD06:55Sydney Kingsford Smith

10 Aug

SYD17:50Sydney Kingsford Smith

20h 09m

1 stop

STL22:59Lambert-St Louis

$1,650

Qantas Airways

12 Aug

STL06:00Lambert-St Louis

34h 30m

1 stop

SYD07:30Sydney Kingsford Smith

30 Aug

SYD09:10Sydney Kingsford Smith

28h 49m

1 stop

STL22:59Lambert-St Louis

$1,656

Qantas Airways

22 Aug

STL17:11Lambert-St Louis

22h 44m

1 stop

SYD06:55Sydney Kingsford Smith

8 Sept

SYD17:50Sydney Kingsford Smith

20h 09m

1 stop

STL22:59Lambert-St Louis

$1,719

American Airlines flights from St. Louis to Sydney

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

American Airlines

12 Aug

STL12:45Lambert-St Louis

27h 10m

1 stop

SYD06:55Sydney Kingsford Smith

30 Aug

SYD09:10Sydney Kingsford Smith

23h 55m

2 stops

STL18:05Lambert-St Louis

$1,728

American Airlines

10 Aug

STL06:00Lambert-St Louis

34h 05m

1 stop

SYD07:05Sydney Kingsford Smith

17 Aug

SYD17:50Sydney Kingsford Smith

20h 09m

1 stop

STL22:59Lambert-St Louis

$1,745

American Airlines

1 Aug

STL14:35Lambert-St Louis

25h 20m

2 stops

SYD06:55Sydney Kingsford Smith

22 Aug

SYD09:10Sydney Kingsford Smith

23h 27m

2 stops

STL17:37Lambert-St Louis

$1,882

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 3/8

19:22-06:55

1 stop20h 33m

Sydney Kingsford Smith

Mon 10/8

17:50-22:59

1 stop20h 09m

$1,650

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

06:00-07:30

1 stop34h 30m

Sydney Kingsford Smith

Sun 30/8

09:10-22:59

1 stop28h 49m

$1,656

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

16:48-07:00

2 stops23h 12m

Sydney Kingsford Smith

Mon 17/8

10:20-18:39

1 stop23h 19m

$1,708

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

15:39-06:50

2 stops24h 11m

Sydney Kingsford Smith

Mon 17/8

09:15-23:26

2 stops29h 11m

$1,714

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

12:52-06:50

2 stops26h 58m

Sydney Kingsford Smith

Sun 30/8

09:15-23:58

2 stops29h 43m

$1,715

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 22/8

17:11-06:55

1 stop22h 44m

Sydney Kingsford Smith

Tue 8/9

17:50-22:59

1 stop20h 09m

$1,719

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

12:45-06:55

1 stop27h 10m

Sydney Kingsford Smith

Sun 30/8

09:10-18:05

2 stops23h 55m

$1,728

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 8/8

17:00-06:50

2 stops46h 50m

Sydney Kingsford Smith

Wed 19/8

09:15-18:55

2 stops24h 40m

$1,735

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 10/8

06:00-07:05

1 stop34h 05m

Sydney Kingsford Smith

Mon 17/8

17:50-22:59

1 stop20h 09m

$1,745

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 8/8

17:00-06:50

2 stops46h 50m

Sydney Kingsford Smith

Sun 16/8

09:15-00:41

2 stops54h 26m

$1,758

Flights are sorted by cheapest return flights first.

Showing 1-10 of 19 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 cheapest month to fly to Sydney?

The month of July is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $1,672. If you aren’t able to travel to Sydney during the month of July, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $1,806.

Can stopping save me money on St. Louis to Sydney flights?

You could potentially save up to 42% on your flight if you consider stops on a St. Louis to Sydney flight.

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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Why use momondo?

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.

How can momondo help me find flights from St. Louis to Sydney?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Sydney.

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.