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

Air Canada, Qantas Airways, 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.

$857 Cheap Flights from St. Louis to Sydney in 2025/26

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 $1,969 to $2,822. The lowest price recently found on this route was $1,469.

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Find the cheapest flights from St. Louis to Sydney

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One-way

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Cheap return flights

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07:00 - 09:00STL-SYD

33h 00m1 stop

07:05 - 23:57SYD-STL

33h 52m2 stops

$1,469Qantas Airways

Find Deal

Mon, 1 Dec - Sat, 6 Dec

18:50 - 20:50STL-SYD

33h 00m2 stops

11:20 - 23:09SYD-STL

27h 49m1 stop

$1,488Qantas Airways

Find Deal

Sun, 1 Mar - Wed, 18 Mar

17:30 - 20:50STL-SYD

34h 20m2 stops

17:45 - 23:57SYD-STL

23h 12m1 stop

$1,499Qantas Airways

Find Deal

Mon, 8 Dec - Wed, 17 Dec

07:04 - 09:00STL-SYD

32h 56m1 stop

14:35 - 23:48SYD-STL

50h 13m2 stops

$1,533Qantas Airways

Find Deal

Mon, 9 Feb - Thu, 26 Feb

06:30 - 09:00STL-SYD

33h 30m1 stop

17:50 - 23:48SYD-STL

46h 58m2 stops

$1,557Qantas Airways

Find Deal

Mon, 16 Feb - Mon, 23 Feb

13:20 - 22:25STL-SYD

40h 05m2 stops

14:05 - 19:27SYD-STL

22h 22m1 stop

$1,675Qantas Airways

Find Deal

Fri, 28 Nov - Sun, 14 Dec

13:30 - 07:20STL-SYD

26h 50m2 stops

09:20 - 18:25SYD-STL

48h 05m2 stops

$1,681Multiple Airlines

Find Deal

Mon, 4 May - Mon, 18 May

13:30 - 07:20STL-SYD

26h 50m2 stops

09:20 - 18:25SYD-STL

48h 05m2 stops

$1,683Multiple Airlines

Find Deal

Mon, 4 May - Mon, 18 May

16:05 - 07:20STL-SYD

48h 15m2 stops

09:20 - 18:25SYD-STL

48h 05m2 stops

$1,684Air Canada

Find Deal

Sat, 18 Apr - Tue, 12 May

13:30 - 07:20STL-SYD

50h 50m3 stops

09:20 - 18:25SYD-STL

48h 05m2 stops

$1,686Air Canada

Find Deal

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

1 Dec

STL07:00Lambert-St Louis

33h 00m

1 stop

SYD09:00Sydney Kingsford Smith

6 Dec

SYD07:05Sydney Kingsford Smith

33h 52m

2 stops

STL23:57Lambert-St Louis

$1,469

Find similar

Qantas Airways

1 Mar

STL18:50Lambert-St Louis

33h 00m

2 stops

SYD20:50Sydney Kingsford Smith

18 Mar

SYD11:20Sydney Kingsford Smith

27h 49m

1 stop

STL23:09Lambert-St Louis

$1,488

Find similar

Qantas Airways

8 Dec

STL17:30Lambert-St Louis

34h 20m

2 stops

SYD20:50Sydney Kingsford Smith

17 Dec

SYD17:45Sydney Kingsford Smith

23h 12m

1 stop

STL23:57Lambert-St Louis

$1,499

Find similar

Air Canada flights from St. Louis to Sydney

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

Air Canada

18 Apr

STL16:05Lambert-St Louis

48h 15m

2 stops

SYD07:20Sydney Kingsford Smith

12 May

SYD09:20Sydney Kingsford Smith

48h 05m

2 stops

STL18:25Lambert-St Louis

$1,684

Find similar

Air Canada

4 May

STL13:30Lambert-St Louis

50h 50m

3 stops

SYD07:20Sydney Kingsford Smith

18 May

SYD09:20Sydney Kingsford Smith

48h 05m

2 stops

STL18:25Lambert-St Louis

$1,686

Find similar

Air Canada

16 Feb

STL08:41Lambert-St Louis

31h 54m

2 stops

SYD09:35Sydney Kingsford Smith

23 Feb

SYD11:20Sydney Kingsford Smith

45h 09m

2 stops

STL15:29Lambert-St Louis

$1,692

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 1/12

07:00-09:00

1 stop33h 00m

Sydney Kingsford Smith

Sat 6/12

07:05-23:57

2 stops33h 52m

$1,469

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/3

18:50-20:50

2 stops33h 00m

Sydney Kingsford Smith

Wed 18/3

11:20-23:09

1 stop27h 49m

$1,488

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 8/12

17:30-20:50

2 stops34h 20m

Sydney Kingsford Smith

Wed 17/12

17:45-23:57

1 stop23h 12m

$1,499

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 9/2

07:04-09:00

1 stop32h 56m

Sydney Kingsford Smith

Thu 26/2

14:35-23:48

2 stops50h 13m

$1,533

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 16/2

06:30-09:00

1 stop33h 30m

Sydney Kingsford Smith

Mon 23/2

17:50-23:48

2 stops46h 58m

$1,557

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/11

13:20-22:25

2 stops40h 05m

Sydney Kingsford Smith

Sun 14/12

14:05-19:27

1 stop22h 22m

$1,675

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

13:30-07:20

2 stops26h 50m

Sydney Kingsford Smith

Mon 18/5

09:20-18:25

2 stops48h 05m

$1,681

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

13:30-07:20

2 stops26h 50m

Sydney Kingsford Smith

Mon 18/5

09:20-18:25

2 stops48h 05m

$1,683

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 18/4

16:05-07:20

2 stops48h 15m

Sydney Kingsford Smith

Tue 12/5

09:20-18:25

2 stops48h 05m

$1,684

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

13:30-07:20

3 stops50h 50m

Sydney Kingsford Smith

Mon 18/5

09:20-18:25

2 stops48h 05m

$1,686

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 August is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $1,950. 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 $2,036.

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 $1,917. 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 $2,698 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.

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

Direct flights	None

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 20h 25m.
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

Bondi Beach

Coogee

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.