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

United Airlines and Delta 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.

$853 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 $2,304 to $1,827. The lowest price recently found on this route was $1,812.

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from St. Louis to Sydney

Round-trip

One-way

Last minute

Cheap return flights

Enter your travel dates to find the best prices.

17:00 - 08:15

STL

SYD

24h 15m

2 stops

10:30 - 18:14

SYD

STL

23h 44m

2 stops

$1,812Qantas Airways

Wed, 23 Sep - Wed, 7 Oct

05:10 - 07:20

STL

SYD

35h 10m

2 stops

10:20 - 12:13

SYD

STL

41h 53m

3 stops

$1,815Air Canada

Wed, 23 Sep - Wed, 7 Oct

05:10 - 07:20

STL

SYD

35h 10m

2 stops

09:20 - 15:46

SYD

STL

45h 26m

3 stops

$1,816Air Canada

Mon, 20 Jul - Tue, 28 Jul

08:55 - 07:20

STL

SYD

31h 25m

2 stops

10:20 - 18:41

SYD

STL

24h 21m

2 stops

$1,818Air Canada

Wed, 23 Sep - Wed, 7 Oct

09:43 - 07:20

STL

SYD

30h 37m

3 stops

10:20 - 12:13

SYD

STL

41h 53m

3 stops

$1,826Air Canada

Wed, 23 Sep - Wed, 7 Oct

08:55 - 07:20

STL

SYD

31h 25m

1 stop

10:20 - 18:41

SYD

STL

48h 21m

2 stops

$1,832Air Canada

Wed, 23 Sep - Wed, 7 Oct

05:10 - 07:20

STL

SYD

35h 10m

2 stops

09:20 - 23:57

SYD

STL

29h 37m

2 stops

$1,837Air Canada

Mon, 20 Jul - Tue, 28 Jul

08:55 - 07:20

STL

SYD

31h 25m

1 stop

10:20 - 20:00

SYD

STL

25h 40m

1 stop

$1,839Air Canada

Wed, 23 Sep - Wed, 7 Oct

05:10 - 07:20

STL

SYD

35h 10m

2 stops

09:20 - 23:57

SYD

STL

53h 37m

2 stops

$1,848Air Canada

Wed, 5 Aug - Sun, 9 Aug

08:42 - 06:55

STL

SYD

31h 13m

1 stop

10:20 - 18:39

SYD

STL

23h 19m

1 stop

$1,865Air New Zealand

Sun, 16 Aug - Mon, 24 Aug

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

16 Aug

STL08:42Lambert-St Louis

31h 13m

1 stop

SYD06:55Sydney Kingsford Smith

24 Aug

SYD10:20Sydney Kingsford Smith

23h 19m

1 stop

STL18:39Lambert-St Louis

$1,865

Air New Zealand

25 July

STL19:05Lambert-St Louis

44h 55m

2 stops

SYD07:00Sydney Kingsford Smith

8 Aug

SYD09:30Sydney Kingsford Smith

22h 03m

2 stops

STL16:33Lambert-St Louis

$1,965

Air New Zealand

6 June

STL17:29Lambert-St Louis

46h 31m

2 stops

SYD07:00Sydney Kingsford Smith

20 June

SYD09:30Sydney Kingsford Smith

26h 27m

2 stops

STL20:57Lambert-St Louis

$1,966

United Airlines flights from St. Louis to Sydney

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

United Airlines

7 June

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

21 June

SYD10:20Sydney Kingsford Smith

22h 57m

1 stop

STL18:17Lambert-St Louis

$1,855

United Airlines

1 July

STL06:01Lambert-St Louis

33h 54m

2 stops

SYD06:55Sydney Kingsford Smith

8 July

SYD10:20Sydney Kingsford Smith

22h 57m

1 stop

STL18:17Lambert-St Louis

$1,867

United Airlines

30 June

STL13:13Lambert-St Louis

26h 47m

2 stops

SYD07:00Sydney Kingsford Smith

7 July

SYD09:30Sydney Kingsford Smith

23h 43m

2 stops

STL18:13Lambert-St Louis

$1,874

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 23/9

17:00-08:15

2 stops24h 15m

Sydney Kingsford Smith

Wed 7/10

10:30-18:14

2 stops23h 44m

$1,812

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 23/9

05:10-07:20

2 stops35h 10m

Sydney Kingsford Smith

Wed 7/10

10:20-12:13

3 stops41h 53m

$1,815

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 20/7

05:10-07:20

2 stops35h 10m

Sydney Kingsford Smith

Tue 28/7

09:20-15:46

3 stops45h 26m

$1,816

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 23/9

08:55-07:20

2 stops31h 25m

Sydney Kingsford Smith

Wed 7/10

10:20-18:41

2 stops24h 21m

$1,818

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 23/9

09:43-07:20

3 stops30h 37m

Sydney Kingsford Smith

Wed 7/10

10:20-12:13

3 stops41h 53m

$1,826

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 23/9

08:55-07:20

1 stop31h 25m

Sydney Kingsford Smith

Wed 7/10

10:20-18:41

2 stops48h 21m

$1,832

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 20/7

05:10-07:20

2 stops35h 10m

Sydney Kingsford Smith

Tue 28/7

09:20-23:57

2 stops29h 37m

$1,837

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 23/9

08:55-07:20

1 stop31h 25m

Sydney Kingsford Smith

Wed 7/10

10:20-20:00

1 stop25h 40m

$1,839

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/8

05:10-07:20

2 stops35h 10m

Sydney Kingsford Smith

Sun 9/8

09:20-23:57

2 stops53h 37m

$1,848

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 16/8

08:42-06:55

1 stop31h 13m

Sydney Kingsford Smith

Mon 24/8

10:20-18:39

1 stop23h 19m

$1,865

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 $1,728. 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 $1,735.

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.

Parramatta

Wollongong

Terrigal

Penrith

Katoomba

Manly

Lithgow

Coogee

Leura

Bondi Beach

Cronulla

Randwick

Charlestown

Newport

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.