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

United Airlines 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.

$902 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 low for flights on this route. Typical prices usually range from $1,991 to $2,523. The lowest price recently found on this route was $1,711.

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.

15:13 - 07:00

STL

SYD

24h 47m

2 stops

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,711United Airlines

Wed, 12 Aug - Sun, 30 Aug

11:15 - 06:55

STL

SYD

28h 40m

2 stops

10:20 - 16:34

SYD

STL

21h 14m

2 stops

$1,717United Airlines

Wed, 12 Aug - Sun, 30 Aug

18:13 - 20:50

STL

SYD

33h 37m

2 stops

11:15 - 23:42

SYD

STL

29h 27m

1 stop

$1,786Qantas Airways

Sun, 15 Nov - Wed, 25 Nov

08:48 - 06:50

STL

SYD

31h 02m

2 stops

09:15 - 16:47

SYD

STL

22h 32m

2 stops

$1,805Delta

Mon, 31 Aug - Wed, 9 Sep

18:13 - 20:50

STL

SYD

33h 37m

2 stops

11:15 - 23:42

SYD

STL

29h 27m

1 stop

$1,813Qantas Airways

Sun, 15 Nov - Wed, 25 Nov

07:00 - 09:00

STL

SYD

33h 00m

1 stop

17:50 - 16:40

SYD

STL

39h 50m

2 stops

$1,835Qantas Airways

Sun, 1 Nov - Sat, 7 Nov

07:00 - 11:55

STL

SYD

35h 55m

2 stops

14:05 - 12:37

SYD

STL

39h 32m

1 stop

$1,848Qantas Airways

Thu, 12 Nov - Wed, 25 Nov

06:01 - 06:55

STL

SYD

33h 54m

2 stops

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,855United Airlines

Thu, 6 Aug - Thu, 13 Aug

11:25 - 07:00

STL

SYD

28h 35m

2 stops

10:20 - 17:50

SYD

STL

22h 30m

2 stops

$1,861United Airlines

Thu, 6 Aug - Thu, 13 Aug

11:00 - 06:50

STL

SYD

28h 50m

2 stops

09:15 - 16:47

SYD

STL

22h 32m

2 stops

$1,877Delta

Mon, 31 Aug - Thu, 10 Sep

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United Airlines flights from St. Louis to Sydney

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

United Airlines

28 June

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

12 July

SYD09:30Sydney Kingsford Smith

26h 59m

2 stops

STL21:29Lambert-St Louis

$1,695

United Airlines

12 Aug

STL15:13Lambert-St Louis

24h 47m

2 stops

SYD07:00Sydney Kingsford Smith

30 Aug

SYD10:20Sydney Kingsford Smith

23h 19m

1 stop

STL18:39Lambert-St Louis

$1,711

United Airlines

12 Aug

STL11:15Lambert-St Louis

28h 40m

2 stops

SYD06:55Sydney Kingsford Smith

30 Aug

SYD10:20Sydney Kingsford Smith

21h 14m

2 stops

STL16:34Lambert-St Louis

$1,717

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

15 Nov

STL18:13Lambert-St Louis

33h 37m

2 stops

SYD20:50Sydney Kingsford Smith

25 Nov

SYD11:15Sydney Kingsford Smith

29h 27m

1 stop

STL23:42Lambert-St Louis

$1,786

Qantas Airways

15 Nov

STL18:13Lambert-St Louis

33h 37m

2 stops

SYD20:50Sydney Kingsford Smith

25 Nov

SYD11:15Sydney Kingsford Smith

29h 27m

1 stop

STL23:42Lambert-St Louis

$1,813

Qantas Airways

1 Nov

STL07:00Lambert-St Louis

33h 00m

1 stop

SYD09:00Sydney Kingsford Smith

7 Nov

SYD17:50Sydney Kingsford Smith

39h 50m

2 stops

STL16:40Lambert-St Louis

$1,835

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

15:13-07:00

2 stops24h 47m

Sydney Kingsford Smith

Sun 30/8

10:20-18:39

1 stop23h 19m

$1,711

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 12/8

11:15-06:55

2 stops28h 40m

Sydney Kingsford Smith

Sun 30/8

10:20-16:34

2 stops21h 14m

$1,717

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 15/11

18:13-20:50

2 stops33h 37m

Sydney Kingsford Smith

Wed 25/11

11:15-23:42

1 stop29h 27m

$1,786

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 31/8

08:48-06:50

2 stops31h 02m

Sydney Kingsford Smith

Wed 9/9

09:15-16:47

2 stops22h 32m

$1,805

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 15/11

18:13-20:50

2 stops33h 37m

Sydney Kingsford Smith

Wed 25/11

11:15-23:42

1 stop29h 27m

$1,813

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/11

07:00-09:00

1 stop33h 00m

Sydney Kingsford Smith

Sat 7/11

17:50-16:40

2 stops39h 50m

$1,835

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 12/11

07:00-11:55

2 stops35h 55m

Sydney Kingsford Smith

Wed 25/11

14:05-12:37

1 stop39h 32m

$1,848

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 6/8

06:01-06:55

2 stops33h 54m

Sydney Kingsford Smith

Thu 13/8

10:20-18:39

1 stop23h 19m

$1,855

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 6/8

11:25-07:00

2 stops28h 35m

Sydney Kingsford Smith

Thu 13/8

10:20-17:50

2 stops22h 30m

$1,861

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 31/8

11:00-06:50

2 stops28h 50m

Sydney Kingsford Smith

Thu 10/9

09:15-16:47

2 stops22h 32m

$1,877

Flights are sorted by cheapest return flights first.

Showing 1-10 of 15 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 $1,806. If you aren’t able to travel to Sydney during the month of March, then flying in July is also cheap. Prices for this month can be found on momondo for an average of $1,878.

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	24h 47m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 24h 47m

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 24h 47m.
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 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.

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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.