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

Air Canada and United Airlines 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.

$1,017 Cheap Flights from St. Louis to Sydney in 2025/26

1 adult

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Find the cheapest flights from St. Louis to Sydney

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07:04 - 07:35

STL

SYD

55h 31m2 stops

11:20 - 23:59

SYD

STL

29h 39m1 stop

$1,421Qantas Airways

Sat, 31 Jan - Sat, 7 Feb

14:45 - 09:35

STL

SYD

25h 50m2 stops

11:20 - 15:29

SYD

STL

45h 09m2 stops

$1,460Multiple Airlines

Sun, 1 Feb - Sun, 8 Feb

16:05 - 08:35

STL

SYD

48h 30m2 stops

10:25 - 15:29

SYD

STL

45h 04m2 stops

$1,463Air Canada

Sat, 14 Mar - Mon, 23 Mar

17:55 - 07:35

STL

SYD

44h 40m2 stops

11:20 - 23:59

SYD

STL

28h 39m1 stop

$1,520Qantas Airways

Sat, 7 Mar - Sat, 14 Mar

07:04 - 09:00

STL

SYD

32h 56m1 stop

19:15 - 23:48

SYD

STL

45h 33m2 stops

$1,522Qantas Airways

Mon, 2 Feb - Mon, 2 Mar

16:05 - 09:35

STL

SYD

48h 30m2 stops

11:20 - 15:29

SYD

STL

45h 09m2 stops

$1,528Air Canada

Sat, 31 Jan - Sat, 7 Feb

16:05 - 08:35

STL

SYD

48h 30m2 stops

10:20 - 15:29

SYD

STL

45h 09m2 stops

$1,560Air Canada

Sun, 15 Mar - Tue, 24 Mar

09:00 - 07:20

STL

SYD

31h 20m2 stops

09:20 - 20:45

SYD

STL

26h 25m2 stops

$1,561Air Canada

Tue, 7 Apr - Sun, 12 Apr

16:30 - 09:35

STL

SYD

48h 05m2 stops

11:20 - 15:29

SYD

STL

45h 09m2 stops

$1,604Air Canada

Sat, 14 Feb - Wed, 18 Feb

18:00 - 07:20

STL

SYD

46h 20m2 stops

09:20 - 20:54

SYD

STL

50h 34m2 stops

$1,619Air Canada

Mon, 4 May - Mon, 18 May

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

31 Jan

STL07:04Lambert-St Louis

55h 31m

2 stops

SYD07:35Sydney Kingsford Smith

7 Feb

SYD11:20Sydney Kingsford Smith

29h 39m

1 stop

STL23:59Lambert-St Louis

$1,421

Find similar

Qantas Airways

7 Mar

STL17:55Lambert-St Louis

44h 40m

2 stops

SYD07:35Sydney Kingsford Smith

14 Mar

SYD11:20Sydney Kingsford Smith

28h 39m

1 stop

STL23:59Lambert-St Louis

$1,520

Find similar

Qantas Airways

2 Feb

STL07:04Lambert-St Louis

32h 56m

1 stop

SYD09:00Sydney Kingsford Smith

2 Mar

SYD19:15Sydney Kingsford Smith

45h 33m

2 stops

STL23:48Lambert-St Louis

$1,522

Find similar

United Airlines flights from St. Louis to Sydney

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

United Airlines

14 Mar

STL16:47Lambert-St Louis

22h 13m

1 stop

SYD07:00Sydney Kingsford Smith

23 Mar

SYD12:10Sydney Kingsford Smith

26h 15m

1 stop

STL22:25Lambert-St Louis

$1,835

Find similar

United Airlines

2 May

STL16:44Lambert-St Louis

47h 16m

2 stops

SYD07:00Sydney Kingsford Smith

16 May

SYD10:20Sydney Kingsford Smith

21h 35m

2 stops

STL16:55Lambert-St Louis

$1,867

Find similar

United Airlines

10 June

STL19:06Lambert-St Louis

20h 49m

1 stop

SYD06:55Sydney Kingsford Smith

17 June

SYD09:30Sydney Kingsford Smith

26h 29m

2 stops

STL20:59Lambert-St Louis

$2,219

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 31/1

07:04-07:35

2 stops55h 31m

Sydney Kingsford Smith

Sat 7/2

11:20-23:59

1 stop29h 39m

$1,421

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/2

14:45-09:35

2 stops25h 50m

Sydney Kingsford Smith

Sun 8/2

11:20-15:29

2 stops45h 09m

$1,460

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 14/3

16:05-08:35

2 stops48h 30m

Sydney Kingsford Smith

Mon 23/3

10:25-15:29

2 stops45h 04m

$1,463

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 7/3

17:55-07:35

2 stops44h 40m

Sydney Kingsford Smith

Sat 14/3

11:20-23:59

1 stop28h 39m

$1,520

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 2/2

07:04-09:00

1 stop32h 56m

Sydney Kingsford Smith

Mon 2/3

19:15-23:48

2 stops45h 33m

$1,522

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 31/1

16:05-09:35

2 stops48h 30m

Sydney Kingsford Smith

Sat 7/2

11:20-15:29

2 stops45h 09m

$1,528

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 15/3

16:05-08:35

2 stops48h 30m

Sydney Kingsford Smith

Tue 24/3

10:20-15:29

2 stops45h 09m

$1,560

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 7/4

09:00-07:20

2 stops31h 20m

Sydney Kingsford Smith

Sun 12/4

09:20-20:45

2 stops26h 25m

$1,561

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 14/2

16:30-09:35

2 stops48h 05m

Sydney Kingsford Smith

Wed 18/2

11:20-15:29

2 stops45h 09m

$1,604

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

18:00-07:20

2 stops46h 20m

Sydney Kingsford Smith

Mon 18/5

09:20-20:54

2 stops50h 34m

$1,619

Flights are sorted by cheapest return flights first.

Showing 1-10 of 17 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 August is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $1,929. If you aren’t able to travel to Sydney during the month of August, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $2,014.

What is the cheapest time of day to depart on your flight to Sydney?

According to our data, the cheapest time of day to fly to Sydney is in the afternoon. momondo users have found flights departing from St. Louis to Sydney in the afternoon for as low as $1,896. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $2,668 on average. Flights to Sydney from St. Louis in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

How far in advance should I book a flight to Sydney?

You are more likely to see cheaper flights to Sydney from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $2,198 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from St. Louis for as low as $1,434 on momondo.

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	25h 30m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 25h 30m

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 25h 30m.
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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Penrith

Katoomba

Lithgow

Leura

Manly

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Cronulla

Randwick

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Newport

Swansea

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.