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

United Airlines 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.

$1,080 Cheap Flights from St. Louis to Sydney in 2026

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.

16:17 - 08:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 18m2 stops Houston George Bush Intcntl Auckland Intl

19:25 - 22:06SYD Sydney Kingsford Smith-STL Lambert-St Louis

43h 41m2 stops Auckland Intl Houston George Bush Intcntl

$1,817Air New Zealand

Mon, 8 Feb - Sat, 13 Feb

08:00 - 10:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

33h 35m2 stops San Francisco Auckland Intl

07:30 - 22:15SYD Sydney Kingsford Smith-STL Lambert-St Louis

31h 45m2 stops Auckland Intl San Francisco

$1,833Air New Zealand

Thu, 12 Nov - Sun, 22 Nov

17:00 - 06:55STL Lambert-St Louis-SYD Sydney Kingsford Smith

22h 55m1 stop Dallas/Fort Worth

13:00 - 18:20SYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 20m1 stop Dallas/Fort Worth

$1,838Qantas Airways

Wed, 23 Sep - Wed, 7 Oct

16:57 - 11:05STL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 08m2 stops Dallas/Fort Worth Brisbane

14:05 - 18:11SYD Sydney Kingsford Smith-STL Lambert-St Louis

21h 06m1 stop Dallas/Fort Worth

$1,844Qantas Airways

Wed, 10 Feb - Tue, 16 Feb

14:55 - 07:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 05m1 stop Houston George Bush Intcntl

11:50 - 18:05SYD Sydney Kingsford Smith-STL Lambert-St Louis

23h 15m1 stop San Francisco

$1,856United Airlines

Tue, 10 Nov - Tue, 24 Nov

19:05 - 09:40STL Lambert-St Louis-SYD Sydney Kingsford Smith

45h 35m2 stops San Francisco Brisbane

09:15 - 23:24SYD Sydney Kingsford Smith-STL Lambert-St Louis

31h 09m2 stops Houston George Bush Intcntl Chicago O'Hare Intl

$1,863United Airlines

Sat, 14 Nov - Wed, 18 Nov

16:39 - 07:00STL Lambert-St Louis-SYD Sydney Kingsford Smith

23h 21m2 stops Denver Intl Los Angeles

10:30 - 18:43SYD Sydney Kingsford Smith-STL Lambert-St Louis

24h 13m2 stops Los Angeles San Francisco

$1,868United Airlines

Tue, 29 Sep - Tue, 6 Oct

06:15 - 21:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

48h 35m2 stops Houston George Bush Intcntl Auckland Intl

18:05 - 22:30SYD Sydney Kingsford Smith-STL Lambert-St Louis

43h 25m2 stops Auckland Intl Houston George Bush Intcntl

$1,872Air New Zealand

Mon, 7 Sep - Sun, 27 Sep

14:30 - 06:50STL Lambert-St Louis-SYD Sydney Kingsford Smith

25h 20m2 stops Atlanta Hartsfield-Jackson Los Angeles

10:15 - 23:54SYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 39m2 stops Los Angeles Atlanta Hartsfield-Jackson

$1,875Delta

Wed, 23 Sep - Wed, 7 Oct

08:33 - 08:35STL Lambert-St Louis-SYD Sydney Kingsford Smith

31h 02m3 stops Chicago O'Hare Intl Los Angeles Auckland Intl

09:55 - 22:06SYD Sydney Kingsford Smith-STL Lambert-St Louis

29h 11m2 stops Auckland Intl Houston George Bush Intcntl

$1,879Multiple Airlines

Wed, 10 Feb - Tue, 16 Feb

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

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

8 Feb

STL16:17Lambert-St Louis

23h 18m

2 stops

SYD08:35Sydney Kingsford Smith

13 Feb

SYD19:25Sydney Kingsford Smith

43h 41m

2 stops

STL22:06Lambert-St Louis

$1,817

Air New Zealand

12 Nov

STL08:00Lambert-St Louis

33h 35m

2 stops

SYD10:35Sydney Kingsford Smith

22 Nov

SYD07:30Sydney Kingsford Smith

31h 45m

2 stops

STL22:15Lambert-St Louis

$1,833

Air New Zealand

7 Sept

STL06:15Lambert-St Louis

48h 35m

2 stops

SYD21:50Sydney Kingsford Smith

27 Sept

SYD18:05Sydney Kingsford Smith

43h 25m

2 stops

STL22:30Lambert-St Louis

$1,872

United Airlines flights from St. Louis to Sydney

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

United Airlines

10 Nov

STL11:00Lambert-St Louis

27h 00m

1 stop

SYD07:00Sydney Kingsford Smith

23 Nov

SYD11:50Sydney Kingsford Smith

23h 15m

1 stop

STL18:05Lambert-St Louis

$1,856

United Airlines

14 Nov

STL19:05Lambert-St Louis

45h 35m

2 stops

SYD09:40Sydney Kingsford Smith

18 Nov

SYD09:15Sydney Kingsford Smith

31h 09m

2 stops

STL23:24Lambert-St Louis

$1,863

United Airlines

29 Sept

STL16:39Lambert-St Louis

23h 21m

2 stops

SYD07:00Sydney Kingsford Smith

6 Oct

SYD10:30Sydney Kingsford Smith

24h 13m

2 stops

STL18:43Lambert-St Louis

$1,868

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 8/2

16:17-08:35

2 stops23h 18m

Sydney Kingsford Smith

Sat 13/2

19:25-22:06

2 stops43h 41m

$1,817

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Thu 12/11

08:00-10:35

2 stops33h 35m

Sydney Kingsford Smith

Sun 22/11

07:30-22:15

2 stops31h 45m

$1,833

Fastest return journey

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 23/9

17:00-06:55

1 stop22h 55m

Sydney Kingsford Smith

Wed 7/10

13:00-18:20

1 stop21h 20m

$1,838

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 10/2

16:57-11:05

2 stops25h 08m

Sydney Kingsford Smith

Tue 16/2

14:05-18:11

1 stop21h 06m

$1,844

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 10/11

14:55-07:00

1 stop23h 05m

Sydney Kingsford Smith

Tue 24/11

11:50-18:05

1 stop23h 15m

$1,856

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Sat 14/11

19:05-09:40

2 stops45h 35m

Sydney Kingsford Smith

Wed 18/11

09:15-23:24

2 stops31h 09m

$1,863

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Tue 29/9

16:39-07:00

2 stops23h 21m

Sydney Kingsford Smith

Tue 6/10

10:30-18:43

2 stops24h 13m

$1,868

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Mon 7/9

06:15-21:50

2 stops48h 35m

Sydney Kingsford Smith

Sun 27/9

18:05-22:30

2 stops43h 25m

$1,872

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 23/9

14:30-06:50

2 stops25h 20m

Sydney Kingsford Smith

Wed 7/10

10:15-23:54

2 stops29h 39m

$1,875

St. LouisSydney

STL Lambert-St Louis - SYD Sydney Kingsford Smith

STLSYD

Lambert-St Louis

Wed 10/2

08:33-08:35

3 stops31h 02m

Sydney Kingsford Smith

Tue 16/2

09:55-22:06

2 stops29h 11m

$1,879

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?

Prices are currently low for flights on this route.

Typical prices usually range from $1,848 to $2,186.
The lowest price recently found on this route was $1,817.

What is the cheapest month to fly to Sydney?

The month of July is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $1,633. If you aren’t able to travel to Sydney during the month of July, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $1,714.

Can stopping save me money on St. Louis to Sydney flights?

You could potentially save up to 19% on your flight if you consider stops on a St. Louis to Sydney flight.

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

Best price found	$1,080
Fastest flight time	21h 14m
Direct flights	None

The best one-way flight to Sydney from St. Louis in the past 72 hours is $1,080. The best return flight deal from St. Louis to Sydney found on momondo in the last 72 hours is $1,817.

The fastest flight from St. Louis to Sydney takes 21h 14m

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 14m.
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

Lithgow

Manly

Coogee

Leura

Randwick

Cronulla

Bondi Beach

Charlestown

Swansea

Newport

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.