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

Qantas Airways 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.

$1,194 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 $2,147 to $1,765. The lowest price recently found on this route was $1,397.

1 adult

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Find the cheapest flights from St. Louis to Sydney

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One-way

Last minute

Cheap return flights

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18:13 - 20:50

STL

SYD

33h 37m

2 stops

11:15 - 23:42

SYD

STL

29h 27m

1 stop

$1,397Qantas Airways

Sun, 1 Nov - Tue, 10 Nov

15:33 - 20:50

STL

SYD

37h 17m

2 stops

11:15 - 00:42

SYD

STL

29h 27m

1 stop

$1,602Qantas Airways

Sat, 24 Oct - Sun, 1 Nov

06:30 - 08:05

STL

SYD

33h 35m

1 stop

17:50 - 14:45

SYD

STL

36h 55m

2 stops

$1,604Qantas Airways

Wed, 21 Oct - Mon, 26 Oct

06:30 - 08:05

STL

SYD

33h 35m

1 stop

17:50 - 14:45

SYD

STL

36h 55m

2 stops

$1,605Qantas Airways

Wed, 21 Oct - Mon, 26 Oct

19:05 - 06:55

STL

SYD

44h 50m

2 stops

10:20 - 16:34

SYD

STL

21h 14m

2 stops

$1,698United Airlines

Sat, 1 Aug - Fri, 14 Aug

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,739United Airlines

Sat, 1 Aug - Fri, 14 Aug

11:25 - 06:50

STL

SYD

28h 25m

2 stops

09:15 - 00:43

SYD

STL

30h 28m

2 stops

$1,744Delta

Fri, 5 Jun - Fri, 12 Jun

13:36 - 06:55

STL

SYD

26h 19m

2 stops

10:20 - 17:30

SYD

STL

22h 10m

2 stops

$1,746United Airlines

Thu, 13 Aug - Sat, 22 Aug

07:05 - 07:20

STL

SYD

33h 15m

2 stops

09:20 - 23:57

SYD

STL

53h 37m

2 stops

$1,866Air Canada

Thu, 21 May - Mon, 25 May

14:15 - 07:20

STL

SYD

26h 05m

2 stops

09:20 - 21:10

SYD

STL

50h 50m

2 stops

$1,870Air Canada

Sun, 24 May - Thu, 28 May

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

27 May

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

6 June

SYD10:20Sydney Kingsford Smith

22h 57m

1 stop

STL18:17Lambert-St Louis

$1,670

Air New Zealand

27 May

STL14:57Lambert-St Louis

24h 58m

2 stops

SYD06:55Sydney Kingsford Smith

6 June

SYD10:20Sydney Kingsford Smith

21h 13m

2 stops

STL16:33Lambert-St Louis

$1,677

Air New Zealand

18 Sept

STL16:40Lambert-St Louis

23h 20m

2 stops

SYD07:00Sydney Kingsford Smith

7 Oct

SYD11:20Sydney Kingsford Smith

23h 18m

1 stop

STL18:38Lambert-St Louis

$2,089

Air Canada flights from St. Louis to Sydney

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

Air Canada

21 May

STL07:05Lambert-St Louis

33h 15m

2 stops

SYD07:20Sydney Kingsford Smith

25 May

SYD09:20Sydney Kingsford Smith

53h 37m

2 stops

STL23:57Lambert-St Louis

$1,866

Air Canada

24 May

STL14:15Lambert-St Louis

26h 05m

2 stops

SYD07:20Sydney Kingsford Smith

28 May

SYD09:20Sydney Kingsford Smith

50h 50m

2 stops

STL21:10Lambert-St Louis

$1,870

Air Canada

13 Oct

STL12:10Lambert-St Louis

28h 10m

2 stops

SYD08:20Sydney Kingsford Smith

18 Nov

SYD11:20Sydney Kingsford Smith

45h 10m

2 stops

STL15:30Lambert-St Louis

$1,946

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/11

18:13-20:50

2 stops33h 37m

Sydney Kingsford Smith

Tue 10/11

11:15-23:42

1 stop29h 27m

$1,397

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 24/10

15:33-20:50

2 stops37h 17m

Sydney Kingsford Smith

Sun 1/11

11:15-00:42

1 stop29h 27m

$1,602

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 21/10

06:30-08:05

1 stop33h 35m

Sydney Kingsford Smith

Mon 26/10

17:50-14:45

2 stops36h 55m

$1,604

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 21/10

06:30-08:05

1 stop33h 35m

Sydney Kingsford Smith

Mon 26/10

17:50-14:45

2 stops36h 55m

$1,605

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 1/8

19:05-06:55

2 stops44h 50m

Sydney Kingsford Smith

Fri 14/8

10:20-16:34

2 stops21h 14m

$1,698

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 1/8

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Fri 14/8

10:20-18:39

1 stop23h 19m

$1,739

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 5/6

11:25-06:50

2 stops28h 25m

Sydney Kingsford Smith

Fri 12/6

09:15-00:43

2 stops30h 28m

$1,744

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 13/8

13:36-06:55

2 stops26h 19m

Sydney Kingsford Smith

Sat 22/8

10:20-17:30

2 stops22h 10m

$1,746

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 21/5

07:05-07:20

2 stops33h 15m

Sydney Kingsford Smith

Mon 25/5

09:20-23:57

2 stops53h 37m

$1,866

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 24/5

14:15-07:20

2 stops26h 05m

Sydney Kingsford Smith

Thu 28/5

09:20-21:10

2 stops50h 50m

$1,870

Flights are sorted by cheapest return flights first.

Showing 1-10 of 13 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 $1,700. If you aren’t able to travel to Sydney during the month of March, then flying in January is also cheap. Prices for this month can be found on momondo for an average of $1,707.

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 49m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 20h 49m

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 49m.
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.