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

Air Canada, American 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.

$994 Cheap Flights from St. Louis to Sydney in 2026

1 adult

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Find the cheapest flights from St. Louis to Sydney

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06:38 - 09:00

STL

SYD

34h 22m1 stop

17:50 - 15:28

SYD

STL

37h 38m2 stops

$1,428Qantas Airways

Sun, 15 Mar - Tue, 24 Mar

16:13 - 07:35

STL

SYD

46h 22m2 stops

11:20 - 23:59

SYD

STL

28h 39m1 stop

$1,515Qantas Airways

Sat, 7 Mar - Sat, 14 Mar

18:18 - 09:10

STL

SYD

45h 52m2 stops

11:20 - 23:59

SYD

STL

28h 39m1 stop

$1,524Qantas Airways

Sat, 7 Mar - Sat, 14 Mar

16:42 - 20:50

STL

SYD

36h 08m2 stops

18:50 - 23:59

SYD

STL

21h 09m1 stop

$1,661Qantas Airways

Sat, 21 Mar - Fri, 3 Apr

14:45 - 09:35

STL

SYD

25h 50m2 stops

10:20 - 15:29

SYD

STL

45h 09m2 stops

$1,698Multiple Airlines

Wed, 4 Mar - Tue, 10 Mar

14:45 - 09:35

STL

SYD

25h 50m2 stops

10:20 - 15:29

SYD

STL

45h 09m2 stops

$1,702Multiple Airlines

Wed, 4 Mar - Tue, 10 Mar

16:05 - 09:35

STL

SYD

48h 30m2 stops

11:20 - 15:29

SYD

STL

45h 09m2 stops

$1,708Air Canada

Sat, 21 Feb - Wed, 25 Feb

16:42 - 20:50

STL

SYD

36h 08m2 stops

18:50 - 23:59

SYD

STL

21h 09m1 stop

$1,728Qantas Airways

Sat, 21 Mar - Fri, 3 Apr

16:05 - 07:20

STL

SYD

48h 15m2 stops

09:20 - 15:24

SYD

STL

45h 04m2 stops

$1,771Air Canada

Mon, 6 Apr - Sat, 11 Apr

16:44 - 10:40

STL

SYD

26h 56m2 stops

11:55 - 22:26

SYD

STL

25h 31m2 stops

$1,799Air New Zealand

Mon, 4 May - Mon, 18 May

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

15 Mar

STL06:38Lambert-St Louis

34h 22m

1 stop

SYD09:00Sydney Kingsford Smith

24 Mar

SYD17:50Sydney Kingsford Smith

37h 38m

2 stops

STL15:28Lambert-St Louis

$1,428

Find similar

Qantas Airways

7 Mar

STL16:13Lambert-St Louis

46h 22m

2 stops

SYD07:35Sydney Kingsford Smith

14 Mar

SYD11:20Sydney Kingsford Smith

28h 39m

1 stop

STL23:59Lambert-St Louis

$1,515

Find similar

Qantas Airways

7 Mar

STL18:18Lambert-St Louis

45h 52m

2 stops

SYD09:10Sydney Kingsford Smith

14 Mar

SYD11:20Sydney Kingsford Smith

28h 39m

1 stop

STL23:59Lambert-St Louis

$1,524

Find similar

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

4 May

STL16:44Lambert-St Louis

26h 56m

2 stops

SYD10:40Sydney Kingsford Smith

18 May

SYD11:55Sydney Kingsford Smith

25h 31m

2 stops

STL22:26Lambert-St Louis

$1,799

Find similar

Air New Zealand

4 May

STL16:44Lambert-St Louis

25h 01m

2 stops

SYD08:45Sydney Kingsford Smith

18 May

SYD09:55Sydney Kingsford Smith

27h 31m

2 stops

STL22:26Lambert-St Louis

$1,806

Find similar

Air New Zealand

18 Mar

STL06:00Lambert-St Louis

36h 30m

2 stops

SYD10:30Sydney Kingsford Smith

24 Mar

SYD19:15Sydney Kingsford Smith

43h 01m

2 stops

STL22:16Lambert-St Louis

$1,851

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 15/3

06:38-09:00

1 stop34h 22m

Sydney Kingsford Smith

Tue 24/3

17:50-15:28

2 stops37h 38m

$1,428

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 7/3

16:13-07:35

2 stops46h 22m

Sydney Kingsford Smith

Sat 14/3

11:20-23:59

1 stop28h 39m

$1,515

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 7/3

18:18-09:10

2 stops45h 52m

Sydney Kingsford Smith

Sat 14/3

11:20-23:59

1 stop28h 39m

$1,524

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 21/3

16:42-20:50

2 stops36h 08m

Sydney Kingsford Smith

Fri 3/4

18:50-23:59

1 stop21h 09m

$1,661

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 4/3

14:45-09:35

2 stops25h 50m

Sydney Kingsford Smith

Tue 10/3

10:20-15:29

2 stops45h 09m

$1,698

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 4/3

14:45-09:35

2 stops25h 50m

Sydney Kingsford Smith

Tue 10/3

10:20-15:29

2 stops45h 09m

$1,702

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 21/2

16:05-09:35

2 stops48h 30m

Sydney Kingsford Smith

Wed 25/2

11:20-15:29

2 stops45h 09m

$1,708

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 21/3

16:42-20:50

2 stops36h 08m

Sydney Kingsford Smith

Fri 3/4

18:50-23:59

1 stop21h 09m

$1,728

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 6/4

16:05-07:20

2 stops48h 15m

Sydney Kingsford Smith

Sat 11/4

09:20-15:24

2 stops45h 04m

$1,771

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

16:44-10:40

2 stops26h 56m

Sydney Kingsford Smith

Mon 18/5

11:55-22:26

2 stops25h 31m

$1,799

Flights are sorted by cheapest return flights first.

Showing 1-10 of 19 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 cheapest month to fly to Sydney?

The month of August is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $1,789. If you aren’t able to travel to Sydney during the month of August, then flying in November is also cheap. Prices for this month can be found on momondo for an average of $1,995.

How far in advance should I book a flight to Sydney?

You are more likely to see cheaper flights to Sydney from St. Louis when booking weeks ahead of your departure date. In general, you can expect to find flights to Sydney for around $2,131 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Sydney from St. Louis for as low as $1,407 on momondo.

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 25m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 21h 25m

There are no direct flights from St. Louis to Sydney. There are no popular flight routes from St. Louis to Sydney.

Search flight deals

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 25m.
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

Leura

Manly

Bondi Beach

Coogee

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.