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

Air Canada, Qantas Airways, and United Airlines 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.

$846 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 $1,625 to $2,032. The lowest price recently found on this route was $1,551.

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Find the cheapest flights from St. Louis to Sydney

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06:21 - 11:55

STL

SYD

38h 34m

2 stops

12:00 - 19:30

SYD

STL

22h 30m

1 stop

$1,551Qantas Airways

Mon, 4 May - Mon, 18 May

06:21 - 09:20

STL

SYD

35h 59m

2 stops

12:00 - 17:21

SYD

STL

20h 21m

1 stop

$1,553Qantas Airways

Thu, 9 Apr - Thu, 16 Apr

11:46 - 06:55

STL

SYD

26h 09m

1 stop

15:35 - 23:58

SYD

STL

24h 23m

2 stops

$1,558Qantas Airways

Sat, 7 Mar - Sat, 14 Mar

06:21 - 10:55

STL

SYD

37h 34m

2 stops

12:00 - 17:21

SYD

STL

20h 21m

1 stop

$1,567Qantas Airways

Mon, 4 May - Mon, 18 May

06:36 - 14:00

STL

SYD

40h 24m

2 stops

12:00 - 16:51

SYD

STL

19h 51m

1 stop

$1,568Qantas Airways

Sat, 1 Aug - Sun, 9 Aug

11:46 - 06:55

STL

SYD

26h 09m

1 stop

21:55 - 15:28

SYD

STL

33h 33m

2 stops

$1,594Qantas Airways

Sat, 7 Mar - Sat, 14 Mar

07:30 - 07:20

STL

SYD

32h 50m

1 stop

09:20 - 12:06

SYD

STL

41h 46m

1 stop

$1,614Multiple Airlines

Mon, 25 May - Sat, 6 Jun

19:06 - 06:55

STL

SYD

20h 49m

1 stop

10:20 - 18:22

SYD

STL

23h 02m

1 stop

$1,619United Airlines

Mon, 4 May - Mon, 18 May

15:25 - 06:50

STL

SYD

24h 25m

2 stops

09:15 - 19:03

SYD

STL

24h 48m

2 stops

$1,625Delta

Mon, 4 May - Mon, 18 May

14:20 - 07:20

STL

SYD

26h 00m

2 stops

09:20 - 20:43

SYD

STL

50h 23m

2 stops

$1,682Air Canada

Fri, 22 May - Mon, 1 Jun

American Airlines flights from St. Louis to Sydney

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

American Airlines

7 Apr

STL12:27Lambert-St Louis

27h 28m

1 stop

SYD06:55Sydney Kingsford Smith

14 Apr

SYD12:00Sydney Kingsford Smith

20h 21m

1 stop

STL17:21Lambert-St Louis

$1,706

American Airlines

9 Apr

STL12:27Lambert-St Louis

27h 28m

1 stop

SYD06:55Sydney Kingsford Smith

16 Apr

SYD12:00Sydney Kingsford Smith

20h 21m

1 stop

STL17:21Lambert-St Louis

$1,836

American Airlines

10 Apr

STL09:34Lambert-St Louis

30h 21m

1 stop

SYD06:55Sydney Kingsford Smith

17 Apr

SYD12:00Sydney Kingsford Smith

20h 21m

1 stop

STL17:21Lambert-St Louis

$1,847

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

19 Apr

STL10:09Lambert-St Louis

31h 36m

2 stops

SYD08:45Sydney Kingsford Smith

25 Apr

SYD19:20Sydney Kingsford Smith

42h 08m

2 stops

STL22:28Lambert-St Louis

$1,747

Air New Zealand

1 Aug

STL19:23Lambert-St Louis

20h 32m

1 stop

SYD06:55Sydney Kingsford Smith

9 Aug

SYD10:20Sydney Kingsford Smith

22h 57m

1 stop

STL18:17Lambert-St Louis

$2,041

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

06:21-11:55

2 stops38h 34m

Sydney Kingsford Smith

Mon 18/5

12:00-19:30

1 stop22h 30m

$1,551

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 9/4

06:21-09:20

2 stops35h 59m

Sydney Kingsford Smith

Thu 16/4

12:00-17:21

1 stop20h 21m

$1,553

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 7/3

11:46-06:55

1 stop26h 09m

Sydney Kingsford Smith

Sat 14/3

15:35-23:58

2 stops24h 23m

$1,558

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

06:21-10:55

2 stops37h 34m

Sydney Kingsford Smith

Mon 18/5

12:00-17:21

1 stop20h 21m

$1,567

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 1/8

06:36-14:00

2 stops40h 24m

Sydney Kingsford Smith

Sun 9/8

12:00-16:51

1 stop19h 51m

$1,568

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 7/3

11:46-06:55

1 stop26h 09m

Sydney Kingsford Smith

Sat 14/3

21:55-15:28

2 stops33h 33m

$1,594

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 25/5

07:30-07:20

1 stop32h 50m

Sydney Kingsford Smith

Sat 6/6

09:20-12:06

1 stop41h 46m

$1,614

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

19:06-06:55

1 stop20h 49m

Sydney Kingsford Smith

Mon 18/5

10:20-18:22

1 stop23h 02m

$1,619

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

15:25-06:50

2 stops24h 25m

Sydney Kingsford Smith

Mon 18/5

09:15-19:03

2 stops24h 48m

$1,625

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 22/5

14:20-07:20

2 stops26h 00m

Sydney Kingsford Smith

Mon 1/6

09:20-20:43

2 stops50h 23m

$1,682

Flights are sorted by cheapest return flights first.

Showing 1-10 of 18 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 $1,803. If you aren’t able to travel to Sydney during the month of August, then flying in March is also cheap. Prices for this month can be found on momondo for an average of $1,837.

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

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

Lithgow

Manly

Leura

Coogee

Bondi Beach

Cronulla

Randwick

Charlestown

Newport

Swansea

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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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