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

Air Canada, EVA Air, 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.

$1,004 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 $1,831 to $2,314. The lowest price recently found on this route was $1,375.

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Find the cheapest flights from St. Louis to Sydney

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07:04 - 09:00

STL

SYD

32h 56m1 stop

07:05 - 23:59

SYD

STL

33h 54m2 stops

$1,375Qantas Airways

Tue, 10 Feb - Tue, 17 Feb

07:04 - 09:00

STL

SYD

32h 56m1 stop

07:05 - 23:59

SYD

STL

33h 54m2 stops

$1,407Qantas Airways

Thu, 22 Jan - Thu, 29 Jan

07:04 - 07:35

STL

SYD

55h 31m2 stops

11:20 - 23:59

SYD

STL

29h 39m1 stop

$1,408Qantas Airways

Thu, 29 Jan - Thu, 5 Feb

06:38 - 09:00

STL

SYD

34h 22m1 stop

13:05 - 15:28

SYD

STL

42h 23m2 stops

$1,441Qantas 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

$1,507Qantas 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

$1,510Qantas Airways

Sat, 7 Mar - Sat, 14 Mar

17:12 - 17:40

STL

SYD

31h 28m2 stops

11:20 - 23:59

SYD

STL

29h 39m1 stop

$1,627Qantas Airways

Wed, 21 Jan - Sat, 31 Jan

18:50 - 14:50

STL

SYD

27h 00m2 stops

17:45 - 23:59

SYD

STL

23h 14m1 stop

$1,642Qantas Airways

Sun, 15 Feb - Sun, 22 Feb

06:38 - 09:00

STL

SYD

33h 22m1 stop

19:15 - 23:59

SYD

STL

45h 44m2 stops

$1,670Qantas Airways

Fri, 13 Feb - Tue, 17 Feb

06:38 - 09:00

STL

SYD

33h 22m1 stop

19:15 - 23:59

SYD

STL

45h 44m2 stops

$1,672Qantas Airways

Fri, 13 Feb - Tue, 17 Feb

Air Canada flights from St. Louis to Sydney

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

Air Canada

10 Feb

STL16:05Lambert-St Louis

48h 30m

2 stops

SYD09:35Sydney Kingsford Smith

17 Feb

SYD11:20Sydney Kingsford Smith

45h 09m

2 stops

STL15:29Lambert-St Louis

$1,718

Find similar

Air Canada

4 Apr

STL16:05Lambert-St Louis

48h 15m

2 stops

SYD07:20Sydney Kingsford Smith

11 Apr

SYD09:20Sydney Kingsford Smith

45h 04m

2 stops

STL15:24Lambert-St Louis

$1,781

Find similar

Air Canada

25 Feb

STL16:05Lambert-St Louis

48h 30m

2 stops

SYD09:35Sydney Kingsford Smith

16 Mar

SYD10:25Sydney Kingsford Smith

45h 04m

2 stops

STL15:29Lambert-St Louis

$1,787

Find similar

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

10 Feb

STL07:04Lambert-St Louis

32h 56m

1 stop

SYD09:00Sydney Kingsford Smith

17 Feb

SYD07:05Sydney Kingsford Smith

33h 54m

2 stops

STL23:59Lambert-St Louis

$1,375

Find similar

Qantas Airways

22 Jan

STL07:04Lambert-St Louis

32h 56m

1 stop

SYD09:00Sydney Kingsford Smith

29 Jan

SYD07:05Sydney Kingsford Smith

33h 54m

2 stops

STL23:59Lambert-St Louis

$1,407

Find similar

Qantas Airways

29 Jan

STL07:04Lambert-St Louis

55h 31m

2 stops

SYD07:35Sydney Kingsford Smith

5 Feb

SYD11:20Sydney Kingsford Smith

29h 39m

1 stop

STL23:59Lambert-St Louis

$1,408

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 10/2

07:04-09:00

1 stop32h 56m

Sydney Kingsford Smith

Tue 17/2

07:05-23:59

2 stops33h 54m

$1,375

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 22/1

07:04-09:00

1 stop32h 56m

Sydney Kingsford Smith

Thu 29/1

07:05-23:59

2 stops33h 54m

$1,407

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 29/1

07:04-07:35

2 stops55h 31m

Sydney Kingsford Smith

Thu 5/2

11:20-23:59

1 stop29h 39m

$1,408

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 15/3

06:38-09:00

1 stop34h 22m

Sydney Kingsford Smith

Tue 24/3

13:05-15:28

2 stops42h 23m

$1,441

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

$1,507

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

$1,510

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 21/1

17:12-17:40

2 stops31h 28m

Sydney Kingsford Smith

Sat 31/1

11:20-23:59

1 stop29h 39m

$1,627

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 15/2

18:50-14:50

2 stops27h 00m

Sydney Kingsford Smith

Sun 22/2

17:45-23:59

1 stop23h 14m

$1,642

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 13/2

06:38-09:00

1 stop33h 22m

Sydney Kingsford Smith

Tue 17/2

19:15-23:59

2 stops45h 44m

$1,670

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 13/2

06:38-09:00

1 stop33h 22m

Sydney Kingsford Smith

Tue 17/2

19:15-23:59

2 stops45h 44m

$1,672

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 August is, on average, the cheapest month to fly to Sydney from St. Louis, with most prices found around $1,910. If you aren’t able to travel to Sydney during the month of August, then flying in October is also cheap. Prices for this month can be found on momondo for an average of $1,994.

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 $2,176 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 $1,420 on momondo.

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	28h 20m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 28h 20m

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 28h 20m.
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.