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.

$762 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 $2,556 to $1,775. The lowest price recently found on this route was $1,805.

1 adult

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Find the cheapest flights from St. Louis to Sydney

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19:24 - 06:55

STL

SYD

20h 31m

1 stop

12:00 - 16:33

SYD

STL

19h 33m

1 stop

$1,805Qantas Airways

Sun, 14 Jun - Sun, 21 Jun

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 18:17

SYD

STL

22h 57m

1 stop

$1,809United Airlines

Mon, 1 Jun - Wed, 10 Jun

13:13 - 07:00

STL

SYD

26h 47m

2 stops

10:20 - 16:33

SYD

STL

21h 13m

2 stops

$1,814United Airlines

Tue, 26 May - Wed, 10 Jun

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 15:46

SYD

STL

44h 26m

2 stops

$1,832United Airlines

Sun, 14 Jun - Sun, 21 Jun

13:38 - 07:00

STL

SYD

26h 22m

2 stops

10:20 - 12:11

SYD

STL

40h 51m

2 stops

$1,838United Airlines

Sun, 14 Jun - Sun, 21 Jun

06:30 - 09:10

STL

SYD

34h 40m

2 stops

14:05 - 16:40

SYD

STL

19h 35m

1 stop

$1,893Qantas Airways

Tue, 13 Oct - Wed, 18 Nov

06:30 - 10:55

STL

SYD

36h 25m

2 stops

14:05 - 16:40

SYD

STL

19h 35m

1 stop

$1,895Qantas Airways

Tue, 13 Oct - Fri, 13 Nov

06:00 - 09:10

STL

SYD

36h 10m

2 stops

12:00 - 18:14

SYD

STL

21h 14m

1 stop

$1,906Qantas Airways

Mon, 7 Sep - Mon, 14 Sep

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 18:17

SYD

STL

22h 57m

1 stop

$1,916United Airlines

Sun, 14 Jun - Sun, 21 Jun

12:10 - 08:20

STL

SYD

28h 10m

2 stops

11:20 - 15:30

SYD

STL

45h 10m

2 stops

$1,977Air Canada

Tue, 13 Oct - Wed, 18 Nov

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

24 Oct

STL06:30Lambert-St Louis

34h 30m

1 stop

SYD09:00Sydney Kingsford Smith

7 Nov

SYD17:50Sydney Kingsford Smith

39h 50m

2 stops

STL16:40Lambert-St Louis

$1,404

Qantas Airways

14 June

STL19:24Lambert-St Louis

20h 31m

1 stop

SYD06:55Sydney Kingsford Smith

21 June

SYD12:00Sydney Kingsford Smith

19h 33m

1 stop

STL16:33Lambert-St Louis

$1,805

Qantas Airways

13 Oct

STL06:30Lambert-St Louis

34h 40m

2 stops

SYD09:10Sydney Kingsford Smith

18 Nov

SYD14:05Sydney Kingsford Smith

19h 35m

1 stop

STL16:40Lambert-St Louis

$1,893

United Airlines flights from St. Louis to Sydney

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

United Airlines

4 May

STL19:06Lambert-St Louis

20h 49m

1 stop

SYD06:55Sydney Kingsford Smith

18 May

SYD10:20Sydney Kingsford Smith

23h 02m

1 stop

STL18:22Lambert-St Louis

$1,807

United Airlines

26 May

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

10 June

SYD10:20Sydney Kingsford Smith

22h 57m

1 stop

STL18:17Lambert-St Louis

$1,809

United Airlines

26 May

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

10 June

SYD09:30Sydney Kingsford Smith

29h 27m

2 stops

STL23:57Lambert-St Louis

$1,814

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 14/6

19:24-06:55

1 stop20h 31m

Sydney Kingsford Smith

Sun 21/6

12:00-16:33

1 stop19h 33m

$1,805

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 1/6

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Wed 10/6

10:20-18:17

1 stop22h 57m

$1,809

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 26/5

13:13-07:00

2 stops26h 47m

Sydney Kingsford Smith

Wed 10/6

10:20-16:33

2 stops21h 13m

$1,814

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 14/6

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Sun 21/6

10:20-15:46

2 stops44h 26m

$1,832

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 14/6

13:38-07:00

2 stops26h 22m

Sydney Kingsford Smith

Sun 21/6

10:20-12:11

2 stops40h 51m

$1,838

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 13/10

06:30-09:10

2 stops34h 40m

Sydney Kingsford Smith

Wed 18/11

14:05-16:40

1 stop19h 35m

$1,893

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 13/10

06:30-10:55

2 stops36h 25m

Sydney Kingsford Smith

Fri 13/11

14:05-16:40

1 stop19h 35m

$1,895

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 7/9

06:00-09:10

2 stops36h 10m

Sydney Kingsford Smith

Mon 14/9

12:00-18:14

1 stop21h 14m

$1,906

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 14/6

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Sun 21/6

10:20-18:17

1 stop22h 57m

$1,916

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 13/10

12:10-08:20

2 stops28h 10m

Sydney Kingsford Smith

Wed 18/11

11:20-15:30

2 stops45h 10m

$1,977

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 $1,710. 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 $1,795.

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

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 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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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.