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

Air Canada and Qantas Airways 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.

$742 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 typical for flights on this route. Typical prices usually range from $1,528 to $2,060. The lowest price recently found on this route was $1,548.

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Find the cheapest flights from St. Louis to Sydney

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13:00 - 07:20

STL

SYD

51h 20m

2 stops

09:20 - 20:25

SYD

STL

26h 05m

2 stops

$1,548Air Canada

Mon, 4 May - Mon, 18 May

13:00 - 07:20

STL

SYD

51h 20m

2 stops

09:20 - 20:25

SYD

STL

50h 05m

3 stops

$1,561Air Canada

Mon, 4 May - Mon, 18 May

06:21 - 09:20

STL

SYD

35h 59m

2 stops

12:00 - 17:21

SYD

STL

20h 21m

1 stop

$1,703Qantas Airways

Sun, 26 Apr - Sun, 3 May

06:00 - 10:40

STL

SYD

37h 40m

2 stops

09:55 - 22:30

SYD

STL

27h 35m

2 stops

$1,708Air New Zealand

Sun, 26 Apr - Sun, 3 May

06:00 - 08:45

STL

SYD

35h 45m

2 stops

09:55 - 05:47

SYD

STL

34h 52m

2 stops

$1,718Air New Zealand

Mon, 4 May - Mon, 18 May

06:00 - 08:45

STL

SYD

35h 45m

2 stops

09:55 - 09:30

SYD

STL

38h 35m

2 stops

$1,729Air New Zealand

Thu, 23 Apr - Thu, 30 Apr

10:09 - 08:45

STL

SYD

31h 36m

2 stops

19:20 - 22:28

SYD

STL

42h 08m

2 stops

$1,735Air New Zealand

Sun, 19 Apr - Sat, 25 Apr

06:21 - 11:55

STL

SYD

38h 34m

2 stops

12:00 - 17:21

SYD

STL

20h 21m

1 stop

$1,741Qantas Airways

Mon, 4 May - Mon, 18 May

06:21 - 13:15

STL

SYD

39h 54m

2 stops

12:00 - 17:21

SYD

STL

20h 21m

1 stop

$1,743Qantas Airways

Mon, 4 May - Mon, 18 May

10:09 - 10:40

STL

SYD

33h 31m

2 stops

19:20 - 22:28

SYD

STL

42h 08m

2 stops

$1,749Air New Zealand

Sun, 19 Apr - Sat, 25 Apr

Air New Zealand flights from St. Louis to Sydney

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

Air New Zealand

26 Apr

STL06:00Lambert-St Louis

37h 40m

2 stops

SYD10:40Sydney Kingsford Smith

3 May

SYD09:55Sydney Kingsford Smith

27h 35m

2 stops

STL22:30Lambert-St Louis

$1,708

Air New Zealand

4 May

STL06:00Lambert-St Louis

35h 45m

2 stops

SYD08:45Sydney Kingsford Smith

18 May

SYD09:55Sydney Kingsford Smith

34h 52m

2 stops

STL05:47Lambert-St Louis

$1,718

Air New Zealand

23 Apr

STL06:00Lambert-St Louis

35h 45m

2 stops

SYD08:45Sydney Kingsford Smith

30 Apr

SYD09:55Sydney Kingsford Smith

38h 35m

2 stops

STL09:30Lambert-St Louis

$1,729

Cathay Pacific flights from St. Louis to Sydney

Our best Cathay Pacific deals on St. Louis to Sydney flight tickets

Cathay Pacific

20 Mar

STL10:33Lambert-St Louis

42h 17m

2 stops

SYD20:50Sydney Kingsford Smith

30 Mar

SYD08:40Sydney Kingsford Smith

55h 18m

2 stops

STL23:58Lambert-St Louis

$3,417

Cathay Pacific

20 Mar

STL10:33Lambert-St Louis

42h 17m

2 stops

SYD20:50Sydney Kingsford Smith

30 Mar

SYD11:35Sydney Kingsford Smith

46h 23m

3 stops

STL17:58Lambert-St Louis

$4,333

Cathay Pacific

17 Mar

STL09:59Lambert-St Louis

34h 01m

2 stops

SYD12:00Sydney Kingsford Smith

2 Apr

SYD15:05Sydney Kingsford Smith

47h 53m

2 stops

STL22:58Lambert-St Louis

$5,467

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

13:00-07:20

2 stops51h 20m

Sydney Kingsford Smith

Mon 18/5

09:20-20:25

2 stops26h 05m

$1,548

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

13:00-07:20

2 stops51h 20m

Sydney Kingsford Smith

Mon 18/5

09:20-20:25

3 stops50h 05m

$1,561

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 26/4

06:21-09:20

2 stops35h 59m

Sydney Kingsford Smith

Sun 3/5

12:00-17:21

1 stop20h 21m

$1,703

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 26/4

06:00-10:40

2 stops37h 40m

Sydney Kingsford Smith

Sun 3/5

09:55-22:30

2 stops27h 35m

$1,708

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

06:00-08:45

2 stops35h 45m

Sydney Kingsford Smith

Mon 18/5

09:55-05:47

2 stops34h 52m

$1,718

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 23/4

06:00-08:45

2 stops35h 45m

Sydney Kingsford Smith

Thu 30/4

09:55-09:30

2 stops38h 35m

$1,729

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 19/4

10:09-08:45

2 stops31h 36m

Sydney Kingsford Smith

Sat 25/4

19:20-22:28

2 stops42h 08m

$1,735

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

06:21-11:55

2 stops38h 34m

Sydney Kingsford Smith

Mon 18/5

12:00-17:21

1 stop20h 21m

$1,741

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

06:21-13:15

2 stops39h 54m

Sydney Kingsford Smith

Mon 18/5

12:00-17:21

1 stop20h 21m

$1,743

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 19/4

10:09-10:40

2 stops33h 31m

Sydney Kingsford Smith

Sat 25/4

19:20-22:28

2 stops42h 08m

$1,749

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 $1,763. 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 $1,819.

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

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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Wollongong

Terrigal

Penrith

Katoomba

Lithgow

Manly

Leura

Coogee

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.

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.

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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.