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

United Airlines is the most popular carrier 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.

$769 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 $1,622 to $2,029. The lowest price recently found on this route was $1,549.

1 adult

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Find the cheapest flights from St. Louis to Sydney

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06:21 - 10:20

STL

SYD

36h 59m

2 stops

12:00 - 19:30

SYD

STL

22h 30m

1 stop

$1,549Qantas Airways

Mon, 4 May - Mon, 18 May

06:30 - 09:20

STL

SYD

35h 50m

2 stops

12:00 - 16:51

SYD

STL

19h 51m

1 stop

$1,554Qantas Airways

Thu, 6 Aug - Thu, 13 Aug

06:30 - 11:55

STL

SYD

38h 25m

2 stops

12:00 - 18:29

SYD

STL

21h 29m

1 stop

$1,597Qantas Airways

Sat, 8 Aug - Sat, 15 Aug

19:05 - 06:50

STL

SYD

44h 45m

2 stops

09:15 - 16:45

SYD

STL

22h 30m

2 stops

$1,605Delta

Sat, 23 May - Sun, 7 Jun

13:02 - 06:50

STL

SYD

26h 48m

2 stops

09:15 - 00:25

SYD

STL

30h 10m

2 stops

$1,607Delta

Mon, 13 Apr - Mon, 20 Apr

19:23 - 06:55

STL

SYD

20h 32m

1 stop

10:20 - 18:17

SYD

STL

22h 57m

1 stop

$1,615United Airlines

Sun, 24 May - Wed, 10 Jun

08:30 - 06:55

STL

SYD

31h 25m

1 stop

10:20 - 18:22

SYD

STL

23h 02m

1 stop

$1,617United Airlines

Mon, 4 May - Mon, 18 May

19:23 - 06:55

STL

SYD

20h 32m

1 stop

09:30 - 16:33

SYD

STL

22h 03m

2 stops

$1,622United Airlines

Sun, 24 May - Wed, 10 Jun

09:59 - 06:50

STL

SYD

29h 51m

2 stops

09:15 - 19:03

SYD

STL

24h 48m

2 stops

$1,624Delta

Mon, 4 May - Mon, 18 May

06:21 - 13:15

STL

SYD

39h 54m

2 stops

12:00 - 19:30

SYD

STL

22h 30m

1 stop

$1,625Qantas Airways

Thu, 30 Apr - Mon, 4 May

United Airlines flights from St. Louis to Sydney

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

United Airlines

4 Mar

STL14:45Lambert-St Louis

25h 30m

2 stops

SYD09:15Sydney Kingsford Smith

10 Mar

SYD14:00Sydney Kingsford Smith

22h 41m

2 stops

STL20:41Lambert-St Louis

$1,601

United Airlines

4 Mar

STL16:28Lambert-St Louis

23h 37m

2 stops

SYD09:05Sydney Kingsford Smith

10 Mar

SYD14:00Sydney Kingsford Smith

24h 59m

2 stops

STL22:59Lambert-St Louis

$1,602

United Airlines

4 Mar

STL16:28Lambert-St Louis

21h 32m

1 stop

SYD07:00Sydney Kingsford Smith

10 Mar

SYD14:00Sydney Kingsford Smith

24h 25m

1 stop

STL22:25Lambert-St Louis

$1,604

Delta flights from St. Louis to Sydney

Our best Delta deals on St. Louis to Sydney flight tickets

Delta

23 May

STL19:05Lambert-St Louis

44h 45m

2 stops

SYD06:50Sydney Kingsford Smith

7 June

SYD09:15Sydney Kingsford Smith

22h 30m

2 stops

STL16:45Lambert-St Louis

$1,605

Delta

13 Apr

STL13:02Lambert-St Louis

26h 48m

2 stops

SYD06:50Sydney Kingsford Smith

20 Apr

SYD09:15Sydney Kingsford Smith

30h 10m

2 stops

STL00:25Lambert-St Louis

$1,607

Delta

4 May

STL09:59Lambert-St Louis

29h 51m

2 stops

SYD06:50Sydney Kingsford Smith

18 May

SYD09:15Sydney Kingsford Smith

24h 48m

2 stops

STL19:03Lambert-St Louis

$1,624

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

06:21-10:20

2 stops36h 59m

Sydney Kingsford Smith

Mon 18/5

12:00-19:30

1 stop22h 30m

$1,549

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 6/8

06:30-09:20

2 stops35h 50m

Sydney Kingsford Smith

Thu 13/8

12:00-16:51

1 stop19h 51m

$1,554

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 8/8

06:30-11:55

2 stops38h 25m

Sydney Kingsford Smith

Sat 15/8

12:00-18:29

1 stop21h 29m

$1,597

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 23/5

19:05-06:50

2 stops44h 45m

Sydney Kingsford Smith

Sun 7/6

09:15-16:45

2 stops22h 30m

$1,605

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 13/4

13:02-06:50

2 stops26h 48m

Sydney Kingsford Smith

Mon 20/4

09:15-00:25

2 stops30h 10m

$1,607

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 24/5

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Wed 10/6

10:20-18:17

1 stop22h 57m

$1,615

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

08:30-06:55

1 stop31h 25m

Sydney Kingsford Smith

Mon 18/5

10:20-18:22

1 stop23h 02m

$1,617

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 24/5

19:23-06:55

1 stop20h 32m

Sydney Kingsford Smith

Wed 10/6

09:30-16:33

2 stops22h 03m

$1,622

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 4/5

09:59-06:50

2 stops29h 51m

Sydney Kingsford Smith

Mon 18/5

09:15-19:03

2 stops24h 48m

$1,624

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 30/4

06:21-13:15

2 stops39h 54m

Sydney Kingsford Smith

Mon 4/5

12:00-19:30

1 stop22h 30m

$1,625

Flights are sorted by cheapest return flights first.

Showing 1-10 of 17 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 $1,800. 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 $1,834.

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	23h 07m
Direct flights	None

The fastest flight from St. Louis to Sydney takes 23h 07m

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 23h 07m.
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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