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.

$731 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 $2,437 to $1,830. The lowest price recently found on this route was $1,639.

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Find the cheapest flights from St. Louis to Sydney

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Cheap return flights

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13:05 - 07:20

STL

SYD

27h 15m

2 stops

09:20 - 12:06

SYD

STL

41h 46m

2 stops

$1,639Air Canada

Thu, 11 Jun - Tue, 16 Jun

08:40 - 07:20

STL

SYD

31h 40m

2 stops

09:20 - 14:02

SYD

STL

43h 42m

2 stops

$1,646Air Canada

Wed, 10 Jun - Sat, 11 Jul

13:05 - 07:20

STL

SYD

51h 15m

3 stops

09:20 - 12:06

SYD

STL

41h 46m

2 stops

$1,650Air Canada

Thu, 11 Jun - Tue, 16 Jun

05:10 - 07:20

STL

SYD

35h 10m

2 stops

09:20 - 14:02

SYD

STL

43h 42m

2 stops

$1,654Air Canada

Mon, 13 Jul - Sun, 19 Jul

05:10 - 07:20

STL

SYD

35h 10m

2 stops

09:20 - 14:00

SYD

STL

43h 40m

2 stops

$1,673Air Canada

Mon, 7 Sep - Mon, 14 Sep

08:40 - 07:20

STL

SYD

31h 40m

1 stop

09:20 - 12:06

SYD

STL

41h 46m

1 stop

$1,702Asiana Airlines

Thu, 11 Jun - Tue, 16 Jun

05:10 - 07:20

STL

SYD

35h 10m

2 stops

09:20 - 12:40

SYD

STL

42h 20m

2 stops

$1,775Air Canada

Sun, 23 Aug - Tue, 1 Sep

13:05 - 07:20

STL

SYD

27h 15m

2 stops

09:20 - 20:25

SYD

STL

26h 05m

2 stops

$1,790Air Canada

Mon, 4 May - Mon, 11 May

07:05 - 07:20

STL

SYD

33h 15m

2 stops

09:20 - 20:25

SYD

STL

26h 05m

2 stops

$1,797Air Canada

Wed, 20 May - Wed, 27 May

07:05 - 07:20

STL

SYD

33h 15m

2 stops

09:20 - 20:25

SYD

STL

26h 05m

2 stops

$1,800Air Canada

Thu, 21 May - Thu, 28 May

Air Canada flights from St. Louis to Sydney

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

Air Canada

11 June

STL13:05Lambert-St Louis

27h 15m

2 stops

SYD07:20Sydney Kingsford Smith

16 June

SYD09:20Sydney Kingsford Smith

41h 46m

2 stops

STL12:06Lambert-St Louis

$1,639

Air Canada

10 June

STL08:40Lambert-St Louis

31h 40m

2 stops

SYD07:20Sydney Kingsford Smith

11 July

SYD09:20Sydney Kingsford Smith

43h 42m

2 stops

STL14:02Lambert-St Louis

$1,646

Air Canada

11 June

STL13:05Lambert-St Louis

51h 15m

3 stops

SYD07:20Sydney Kingsford Smith

16 June

SYD09:20Sydney Kingsford Smith

41h 46m

2 stops

STL12:06Lambert-St Louis

$1,650

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

20 May

STL06:21Lambert-St Louis

35h 59m

2 stops

SYD09:20Sydney Kingsford Smith

27 May

SYD12:00Sydney Kingsford Smith

19h 33m

1 stop

STL16:33Lambert-St Louis

$1,989

Qantas Airways

5 May

STL06:21Lambert-St Louis

45h 49m

2 stops

SYD19:10Sydney Kingsford Smith

12 May

SYD12:00Sydney Kingsford Smith

20h 21m

1 stop

STL17:21Lambert-St Louis

$2,045

Qantas Airways

10 June

STL06:35Lambert-St Louis

36h 45m

2 stops

SYD10:20Sydney Kingsford Smith

11 July

SYD12:00Sydney Kingsford Smith

19h 58m

1 stop

STL16:58Lambert-St Louis

$2,048

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 11/6

13:05-07:20

2 stops27h 15m

Sydney Kingsford Smith

Tue 16/6

09:20-12:06

2 stops41h 46m

$1,639

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 10/6

08:40-07:20

2 stops31h 40m

Sydney Kingsford Smith

Sat 11/7

09:20-14:02

2 stops43h 42m

$1,646

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 11/6

13:05-07:20

3 stops51h 15m

Sydney Kingsford Smith

Tue 16/6

09:20-12:06

2 stops41h 46m

$1,650

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 13/7

05:10-07:20

2 stops35h 10m

Sydney Kingsford Smith

Sun 19/7

09:20-14:02

2 stops43h 42m

$1,654

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 7/9

05:10-07:20

2 stops35h 10m

Sydney Kingsford Smith

Mon 14/9

09:20-14:00

2 stops43h 40m

$1,673

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 11/6

08:40-07:20

1 stop31h 40m

Sydney Kingsford Smith

Tue 16/6

09:20-12:06

1 stop41h 46m

$1,702

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 23/8

05:10-07:20

2 stops35h 10m

Sydney Kingsford Smith

Tue 1/9

09:20-12:40

2 stops42h 20m

$1,775

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

13:05-07:20

2 stops27h 15m

Sydney Kingsford Smith

Mon 11/5

09:20-20:25

2 stops26h 05m

$1,790

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 20/5

07:05-07:20

2 stops33h 15m

Sydney Kingsford Smith

Wed 27/5

09:20-20:25

2 stops26h 05m

$1,797

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 21/5

07:05-07:20

2 stops33h 15m

Sydney Kingsford Smith

Thu 28/5

09:20-20:25

2 stops26h 05m

$1,800

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 $1,748. If you aren’t able to travel to Sydney during the month of March, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $1,799.

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	21h 04m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 21h 04m

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 21h 04m.
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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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.