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

Asiana Airlines and Air New Zealand 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.

$822 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 $2,418 to $1,824. The lowest price recently found on this route was $1,476.

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.

07:00 - 09:00

STL

SYD

33h 00m

1 stop

17:50 - 12:37

SYD

STL

35h 47m

2 stops

$1,476Qantas Airways

Mon, 16 Nov - Sat, 21 Nov

07:00 - 09:00

STL

SYD

33h 00m

1 stop

17:50 - 15:29

SYD

STL

38h 39m

2 stops

$1,759Qantas Airways

Mon, 16 Nov - Sat, 21 Nov

08:49 - 06:50

STL

SYD

31h 01m

2 stops

09:15 - 20:37

SYD

STL

26h 22m

2 stops

$1,833Delta

Fri, 3 Jul - Sat, 18 Jul

14:27 - 06:50

STL

SYD

25h 23m

2 stops

10:15 - 20:37

SYD

STL

26h 22m

2 stops

$1,861Delta

Wed, 23 Sep - Wed, 7 Oct

07:00 - 09:00

STL

SYD

33h 00m

1 stop

17:50 - 15:29

SYD

STL

38h 39m

2 stops

$1,873Qantas Airways

Sun, 8 Nov - Sat, 14 Nov

06:30 - 10:45

STL

SYD

36h 15m

2 stops

19:40 - 23:42

SYD

STL

45h 02m

2 stops

$1,883Qantas Airways

Tue, 13 Oct - Fri, 13 Nov

06:30 - 15:45

STL

SYD

41h 15m

2 stops

19:40 - 23:42

SYD

STL

45h 02m

2 stops

$1,888Qantas Airways

Tue, 13 Oct - Fri, 13 Nov

06:30 - 10:30

STL

SYD

36h 00m

2 stops

09:00 - 23:42

SYD

STL

55h 42m

2 stops

$1,890Qantas Airways

Tue, 13 Oct - Fri, 13 Nov

06:30 - 12:15

STL

SYD

37h 45m

2 stops

22:00 - 23:05

SYD

STL

65h 05m

2 stops

$1,900Qantas Airways

Fri, 16 Oct - Sat, 24 Oct

06:00 - 07:05

STL

SYD

34h 05m

1 stop

17:50 - 22:59

SYD

STL

20h 09m

1 stop

$1,922American Airlines

Sun, 16 Aug - Tue, 25 Aug

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Delta flights from St. Louis to Sydney

Our best Delta deals on St. Louis to Sydney flight tickets

Delta

3 July

STL08:49Lambert-St Louis

31h 01m

2 stops

SYD06:50Sydney Kingsford Smith

18 July

SYD09:15Sydney Kingsford Smith

26h 22m

2 stops

STL20:37Lambert-St Louis

$1,833

Delta

13 Oct

STL11:51Lambert-St Louis

27h 59m

2 stops

SYD07:50Sydney Kingsford Smith

18 Nov

SYD10:40Sydney Kingsford Smith

25h 16m

2 stops

STL18:56Lambert-St Louis

$1,861

American Airlines flights from St. Louis to Sydney

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

American Airlines

16 Aug

STL06:00Lambert-St Louis

34h 05m

1 stop

SYD07:05Sydney Kingsford Smith

25 Aug

SYD17:50Sydney Kingsford Smith

20h 09m

1 stop

STL22:59Lambert-St Louis

$1,922

American Airlines

3 July

STL17:13Lambert-St Louis

22h 42m

1 stop

SYD06:55Sydney Kingsford Smith

18 July

SYD17:50Sydney Kingsford Smith

21h 09m

1 stop

STL23:59Lambert-St Louis

$2,051

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 16/11

07:00-09:00

1 stop33h 00m

Sydney Kingsford Smith

Sat 21/11

17:50-12:37

2 stops35h 47m

$1,476

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 16/11

07:00-09:00

1 stop33h 00m

Sydney Kingsford Smith

Sat 21/11

17:50-15:29

2 stops38h 39m

$1,759

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 3/7

08:49-06:50

2 stops31h 01m

Sydney Kingsford Smith

Sat 18/7

09:15-20:37

2 stops26h 22m

$1,833

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 23/9

14:27-06:50

2 stops25h 23m

Sydney Kingsford Smith

Wed 7/10

10:15-20:37

2 stops26h 22m

$1,861

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 8/11

07:00-09:00

1 stop33h 00m

Sydney Kingsford Smith

Sat 14/11

17:50-15:29

2 stops38h 39m

$1,873

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 13/10

06:30-10:45

2 stops36h 15m

Sydney Kingsford Smith

Fri 13/11

19:40-23:42

2 stops45h 02m

$1,883

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 13/10

06:30-15:45

2 stops41h 15m

Sydney Kingsford Smith

Fri 13/11

19:40-23:42

2 stops45h 02m

$1,888

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 13/10

06:30-10:30

2 stops36h 00m

Sydney Kingsford Smith

Fri 13/11

09:00-23:42

2 stops55h 42m

$1,890

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 16/10

06:30-12:15

2 stops37h 45m

Sydney Kingsford Smith

Sat 24/10

22:00-23:05

2 stops65h 05m

$1,900

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 16/8

06:00-07:05

1 stop34h 05m

Sydney Kingsford Smith

Tue 25/8

17:50-22:59

1 stop20h 09m

$1,922

Flights are sorted by cheapest return flights first.

Showing 1-10 of 16 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 $1,778. 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 $1,849.

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 45m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 23h 45m

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 23h 45m.
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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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.