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

Air Canada is the most popular carrier 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.

$816 Cheap Flights from St. Louis to Sydney in 2026

1 adult

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

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.

06:38 - 09:10

STL

SYD

57h 32m

2 stops

17:45 - 23:59

SYD

STL

23h 14m

1 stop

$1,466Qantas Airways

Sat, 21 Feb - Sat, 28 Feb

16:13 - 07:35

STL

SYD

46h 22m

2 stops

11:20 - 23:58

SYD

STL

28h 38m

1 stop

$1,518Qantas Airways

Sat, 7 Mar - Sat, 14 Mar

08:54 - 07:20

STL

SYD

31h 26m

2 stops

09:20 - 16:57

SYD

STL

22h 37m

2 stops

$1,736Multiple Airlines

Wed, 22 Apr - Wed, 6 May

16:05 - 09:35

STL

SYD

48h 30m

2 stops

10:20 - 15:29

SYD

STL

45h 09m

2 stops

$1,756Air Canada

Wed, 4 Mar - Tue, 10 Mar

16:05 - 09:35

STL

SYD

48h 30m

2 stops

10:20 - 15:29

SYD

STL

45h 09m

2 stops

$1,761Air Canada

Wed, 4 Mar - Tue, 10 Mar

16:05 - 09:35

STL

SYD

48h 30m

2 stops

10:20 - 15:29

SYD

STL

45h 09m

2 stops

$1,764Air Canada

Wed, 4 Mar - Tue, 10 Mar

16:13 - 06:55

STL

SYD

22h 42m

1 stop

13:05 - 17:13

SYD

STL

20h 08m

1 stop

$1,774Qantas Airways

Sun, 8 Mar - Mon, 23 Mar

06:20 - 11:55

STL

SYD

38h 35m

2 stops

12:00 - 19:30

SYD

STL

22h 30m

1 stop

$1,777Qantas Airways

Wed, 22 Apr - Wed, 6 May

18:50 - 10:55

STL

SYD

24h 05m

2 stops

13:05 - 17:13

SYD

STL

20h 08m

1 stop

$1,796Qantas Airways

Sun, 8 Mar - Mon, 23 Mar

16:13 - 10:55

STL

SYD

26h 42m

2 stops

13:05 - 17:13

SYD

STL

20h 08m

1 stop

$1,798Qantas Airways

Sun, 15 Mar - Tue, 24 Mar

American Airlines flights from St. Louis to Sydney

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

American Airlines

15 Mar

STL09:35Lambert-St Louis

29h 20m

1 stop

SYD06:55Sydney Kingsford Smith

24 Mar

SYD11:20Sydney Kingsford Smith

28h 38m

1 stop

STL23:58Lambert-St Louis

$1,863

American Airlines

15 Mar

STL09:35Lambert-St Louis

29h 20m

1 stop

SYD06:55Sydney Kingsford Smith

24 Mar

SYD11:20Sydney Kingsford Smith

28h 38m

1 stop

STL23:58Lambert-St Louis

$1,864

American Airlines

4 Mar

STL14:31Lambert-St Louis

25h 29m

2 stops

SYD09:00Sydney Kingsford Smith

10 Mar

SYD11:20Sydney Kingsford Smith

28h 38m

1 stop

STL23:58Lambert-St Louis

$1,867

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

21 Feb

STL06:38Lambert-St Louis

57h 32m

2 stops

SYD09:10Sydney Kingsford Smith

28 Feb

SYD17:45Sydney Kingsford Smith

23h 14m

1 stop

STL23:59Lambert-St Louis

$1,466

Qantas Airways

7 Mar

STL16:13Lambert-St Louis

46h 22m

2 stops

SYD07:35Sydney Kingsford Smith

14 Mar

SYD11:20Sydney Kingsford Smith

28h 38m

1 stop

STL23:58Lambert-St Louis

$1,518

Qantas Airways

8 Mar

STL16:13Lambert-St Louis

22h 42m

1 stop

SYD06:55Sydney Kingsford Smith

23 Mar

SYD13:05Sydney Kingsford Smith

20h 08m

1 stop

STL17:13Lambert-St Louis

$1,774

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 21/2

06:38-09:10

2 stops57h 32m

Sydney Kingsford Smith

Sat 28/2

17:45-23:59

1 stop23h 14m

$1,466

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 7/3

16:13-07:35

2 stops46h 22m

Sydney Kingsford Smith

Sat 14/3

11:20-23:58

1 stop28h 38m

$1,518

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/4

08:54-07:20

2 stops31h 26m

Sydney Kingsford Smith

Wed 6/5

09:20-16:57

2 stops22h 37m

$1,736

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 4/3

16:05-09:35

2 stops48h 30m

Sydney Kingsford Smith

Tue 10/3

10:20-15:29

2 stops45h 09m

$1,756

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 4/3

16:05-09:35

2 stops48h 30m

Sydney Kingsford Smith

Tue 10/3

10:20-15:29

2 stops45h 09m

$1,761

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 4/3

16:05-09:35

2 stops48h 30m

Sydney Kingsford Smith

Tue 10/3

10:20-15:29

2 stops45h 09m

$1,764

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 8/3

16:13-06:55

1 stop22h 42m

Sydney Kingsford Smith

Mon 23/3

13:05-17:13

1 stop20h 08m

$1,774

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 22/4

06:20-11:55

2 stops38h 35m

Sydney Kingsford Smith

Wed 6/5

12:00-19:30

1 stop22h 30m

$1,777

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 8/3

18:50-10:55

2 stops24h 05m

Sydney Kingsford Smith

Mon 23/3

13:05-17:13

1 stop20h 08m

$1,796

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 15/3

16:13-10:55

2 stops26h 42m

Sydney Kingsford Smith

Tue 24/3

13:05-17:13

1 stop20h 08m

$1,798

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 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 $1,784. If you aren’t able to travel to Sydney during the month of August, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $1,990.

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 $2,126 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 $1,404 on momondo.

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 53m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 23h 53m

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 23h 53m.
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

Leura

Manly

Coogee

Bondi Beach

Cronulla

Randwick

Charlestown

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.