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

Qantas Airways, Fiji 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.

$917 Cheap Flights from St. Louis to Sydney in 2025/26

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 $2,072 to $2,671. The lowest price recently found on this route was $1,657.

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Find the cheapest flights from St. Louis to Sydney

Round-trip

One-way

Last minute

Cheap return flights

07:00 - 09:20STL-SYD

33h 20m2 stops

14:05 - 19:30SYD-STL

22h 25m1 stop

$1,657Qantas Airways

Find Deal

Wed, 5 Nov - Sun, 23 Nov

17:50 - 21:30STL-SYD

34h 40m2 stops

14:05 - 19:27SYD-STL

22h 22m1 stop

$1,663Qantas Airways

Find Deal

Fri, 28 Nov - Sun, 14 Dec

06:00 - 09:50STL-SYD

34h 50m2 stops

14:05 - 16:14SYD-STL

19h 09m1 stop

$1,670Qantas Airways

Find Deal

Mon, 19 Jan - Mon, 26 Jan

14:55 - 19:45STL-SYD

35h 50m2 stops

21:40 - 13:52SYD-STL

33h 12m2 stops

$1,753Alaska Airlines

Find Deal

Sun, 1 Feb - Sat, 14 Feb

16:14 - 19:45STL-SYD

35h 31m2 stops

21:40 - 15:18SYD-STL

34h 38m2 stops

$1,765Alaska Airlines

Find Deal

Thu, 30 Oct - Thu, 6 Nov

13:35 - 08:35STL-SYD

27h 00m2 stops

11:20 - 16:28SYD-STL

22h 08m2 stops

$1,793Air Canada

Find Deal

Wed, 29 Oct - Wed, 5 Nov

13:35 - 08:35STL-SYD

27h 00m2 stops

11:20 - 15:29SYD-STL

45h 09m2 stops

$1,799Air Canada

Find Deal

Thu, 30 Oct - Thu, 6 Nov

14:55 - 19:45STL-SYD

35h 50m2 stops

21:40 - 13:52SYD-STL

33h 12m2 stops

$1,802Hawaiian Airlines

Find Deal

Mon, 19 Jan - Mon, 26 Jan

06:39 - 09:00STL-SYD

34h 21m1 stop

11:20 - 15:29SYD-STL

45h 09m2 stops

$1,942Multiple Airlines

Find Deal

Fri, 31 Oct - Fri, 7 Nov

17:09 - 06:55STL-SYD

21h 46m1 stop

11:20 - 15:29SYD-STL

45h 09m2 stops

$1,993Multiple Airlines

Find Deal

Wed, 29 Oct - Wed, 5 Nov

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

5 Nov

STL07:00Lambert-St Louis

33h 20m

2 stops

SYD09:20Sydney Kingsford Smith

23 Nov

SYD14:05Sydney Kingsford Smith

22h 25m

1 stop

STL19:30Lambert-St Louis

$1,657

Find similar

Qantas Airways

28 Nov

STL17:50Lambert-St Louis

34h 40m

2 stops

SYD21:30Sydney Kingsford Smith

14 Dec

SYD14:05Sydney Kingsford Smith

22h 22m

1 stop

STL19:27Lambert-St Louis

$1,663

Find similar

Qantas Airways

19 Jan

STL06:00Lambert-St Louis

34h 50m

2 stops

SYD09:50Sydney Kingsford Smith

26 Jan

SYD14:05Sydney Kingsford Smith

19h 09m

1 stop

STL16:14Lambert-St Louis

$1,670

Find similar

Alaska Airlines flights from St. Louis to Sydney

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

Alaska Airlines

1 Feb

STL14:55Lambert-St Louis

35h 50m

2 stops

SYD19:45Sydney Kingsford Smith

14 Feb

SYD21:40Sydney Kingsford Smith

33h 12m

2 stops

STL13:52Lambert-St Louis

$1,753

Find similar

Alaska Airlines

30 Oct

STL16:14Lambert-St Louis

35h 31m

2 stops

SYD19:45Sydney Kingsford Smith

6 Nov

SYD21:40Sydney Kingsford Smith

34h 38m

2 stops

STL15:18Lambert-St Louis

$1,765

Find similar

Alaska Airlines

25 Nov

STL07:00Lambert-St Louis

43h 45m

2 stops

SYD19:45Sydney Kingsford Smith

11 Dec

SYD21:40Sydney Kingsford Smith

43h 19m

2 stops

STL23:59Lambert-St Louis

$1,769

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 5/11

07:00-09:20

2 stops33h 20m

Sydney Kingsford Smith

Sun 23/11

14:05-19:30

1 stop22h 25m

$1,657

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 28/11

17:50-21:30

2 stops34h 40m

Sydney Kingsford Smith

Sun 14/12

14:05-19:27

1 stop22h 22m

$1,663

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 19/1

06:00-09:50

2 stops34h 50m

Sydney Kingsford Smith

Mon 26/1

14:05-16:14

1 stop19h 09m

$1,670

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 1/2

14:55-19:45

2 stops35h 50m

Sydney Kingsford Smith

Sat 14/2

21:40-13:52

2 stops33h 12m

$1,753

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 30/10

16:14-19:45

2 stops35h 31m

Sydney Kingsford Smith

Thu 6/11

21:40-15:18

2 stops34h 38m

$1,765

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 29/10

13:35-08:35

2 stops27h 00m

Sydney Kingsford Smith

Wed 5/11

11:20-16:28

2 stops22h 08m

$1,793

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 30/10

13:35-08:35

2 stops27h 00m

Sydney Kingsford Smith

Thu 6/11

11:20-15:29

2 stops45h 09m

$1,799

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 19/1

14:55-19:45

2 stops35h 50m

Sydney Kingsford Smith

Mon 26/1

21:40-13:52

2 stops33h 12m

$1,802

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 31/10

06:39-09:00

1 stop34h 21m

Sydney Kingsford Smith

Fri 7/11

11:20-15:29

2 stops45h 09m

$1,942

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 29/10

17:09-06:55

1 stop21h 46m

Sydney Kingsford Smith

Wed 5/11

11:20-15:29

2 stops45h 09m

$1,993

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 $1,900. 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 $2,039.

What is the cheapest time of day to depart on your flight to Sydney?

According to our data, the cheapest time of day to fly to Sydney is in the afternoon. momondo users have found flights departing from St. Louis to Sydney in the afternoon for as low as $1,881. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $2,647 on average. Flights to Sydney from St. Louis in the morning are generally more expensive because this time of day is more convenient for travellers’ schedules.

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 $2,208 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 $1,943 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

Direct flights	None

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 50m.
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.

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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.