What airlines fly to Sydney?

Qantas Airways, United Airlines and American Airlines are the top three most popular airlines that fly to Sydney from St. Louis according to our data. Qantas Airways is the first choice among our users, with 44% of people opting to fly with this airline when traveling to Sydney. Keep in mind that there are 3 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.

Which layover airport offers the lowest fares from St. Louis to Sydney?

Flights via Los Angeles (LAX) offer the lowest average round-trip price of $1,253.

Which layover airport has the shortest connection time from St. Louis to Sydney?

Dallas (DFW) has the shortest average layover time for this route: 3h 53m.

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

Qantas Airways and American Airlines are the most popular carriers operating from Lambert-St Louis to Sydney Kingsford Smith

Which airport is the most popular layover for flights between St. Louis and Sydney?

Dallas (DFW) was the most common stop: 80% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest travel time from St. Louis to Sydney?

Flights connecting via Dallas (DFW) have the shortest average one-way travel time: 23h 06m.

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 are updated daily.

How many operators does momondo search for flights from Lambert-St Louis Airport to Sydney Kingsford Smith Airport?

The number of operators available for flights from Lambert-St Louis Airport to Sydney Kingsford Smith Airport is 3 as of July 2026.

How old do you have to be to fly from Lambert-St Louis Airport to Sydney Kingsford Smith Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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 travel and health documents you'll need for your trip to Sydney Kingsford Smith Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sydney Kingsford Smith Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$603 Cheap Flights from St. Louis to Sydney in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Sydney

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:00 am - 7:05 am

STL

SYD

34h 05m

1 stop

9:10 am - 10:59 pm

SYD

STL

28h 49m

1 stop

$1,131Qantas Airways

Wed, Aug 12 - Sun, Aug 30

3:32 pm - 6:55 am

STL

SYD

24h 23m

1 stop

12:00 pm - 6:05 pm

SYD

STL

21h 05m

1 stop

$1,169Qantas Airways

Mon, Aug 17 - Mon, Aug 24

7:23 pm - 6:55 am

STL

SYD

20h 32m

1 stop

10:20 am - 6:17 pm

SYD

STL

22h 57m

1 stop

$1,178United Airlines

Sun, Jul 26 - Sun, Aug 9

6:01 am - 6:55 am

STL

SYD

33h 54m

2 stops

10:20 am - 6:39 pm

SYD

STL

23h 19m

1 stop

$1,186United Airlines

Wed, Aug 5 - Wed, Aug 12

12:52 pm - 6:50 am

STL

SYD

26h 58m

2 stops

9:15 am - 11:58 pm

SYD

STL

29h 43m

2 stops

$1,191Delta

Wed, Aug 12 - Sun, Aug 30

5:11 pm - 6:55 am

STL

SYD

22h 44m

1 stop

9:10 am - 6:05 pm

SYD

STL

23h 55m

2 stops

$1,193American Airlines

Wed, Aug 12 - Sun, Aug 30

6:04 am - 8:05 am

STL

SYD

34h 01m

1 stop

7:05 am - 5:02 pm

SYD

STL

25h 57m

2 stops

$1,205Qantas Airways

Tue, Oct 13 - Tue, Oct 27

7:10 pm - 5:40 pm

STL

SYD

30h 30m

2 stops

11:20 am - 11:42 pm

SYD

STL

29h 22m

1 stop

$1,224Qantas Airways

Sat, Oct 24 - Tue, Nov 3

3:35 pm - 6:55 am

STL

SYD

24h 20m

1 stop

12:00 pm - 6:05 pm

SYD

STL

21h 05m

1 stop

$1,267Qantas Airways

Thu, Aug 6 - Thu, Aug 13

12:47 pm - 6:55 am

STL

SYD

26h 08m

1 stop

10:20 am - 11:42 pm

SYD

STL

30h 22m

2 stops

$1,277Qantas Airways

Tue, Oct 13 - Wed, Nov 18

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Air Canada flights from St. Louis to Sydney

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

Air Canada

Sep 18

STL12:10 pmLambert-St Louis

28h 10m

2 stops

SYD7:20 amSydney Kingsford Smith

Oct 23

SYD10:20 amSydney Kingsford Smith

48h 06m

2 stops

STL6:26 pmLambert-St Louis

$1,401

Air Canada

Oct 13

STL4:39 pmLambert-St Louis

23h 41m

2 stops

SYD8:20 amSydney Kingsford Smith

Nov 18

SYD11:20 amSydney Kingsford Smith

41h 46m

3 stops

STL12:06 pmLambert-St Louis

$1,404

Air Canada

Oct 3

STL12:10 pmLambert-St Louis

28h 10m

2 stops

SYD8:20 amSydney Kingsford Smith

Oct 17

SYD10:20 amSydney Kingsford Smith

25h 40m

2 stops

STL8:00 pmLambert-St Louis

$1,406

United Airlines flights from St. Louis to Sydney

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

United Airlines

Jul 26

STL7:23 pmLambert-St Louis

20h 32m

1 stop

SYD6:55 amSydney Kingsford Smith

Aug 9

SYD10:20 amSydney Kingsford Smith

22h 57m

1 stop

STL6:17 pmLambert-St Louis

$1,178

United Airlines

Aug 5

STL6:01 amLambert-St Louis

33h 54m

2 stops

SYD6:55 amSydney Kingsford Smith

Aug 12

SYD10:20 amSydney Kingsford Smith

23h 19m

1 stop

STL6:39 pmLambert-St Louis

$1,186

United Airlines

Aug 20

STL4:40 pmLambert-St Louis

23h 15m

2 stops

SYD6:55 amSydney Kingsford Smith

Aug 28

SYD10:20 amSydney Kingsford Smith

23h 19m

1 stop

STL6:39 pmLambert-St Louis

$1,291

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 8/12

6:00 am-7:05 am

1 stop34h 05m

Sydney Kingsford Smith

Sun 8/30

9:10 am-10:59 pm

1 stop28h 49m

$1,131

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Mon 8/17

3:32 pm-6:55 am

1 stop24h 23m

Sydney Kingsford Smith

Mon 8/24

12:00 pm-6:05 pm

1 stop21h 05m

$1,169

Quickest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sun 7/26

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Sun 8/9

10:20 am-6:17 pm

1 stop22h 57m

$1,178

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 8/5

6:01 am-6:55 am

2 stops33h 54m

Sydney Kingsford Smith

Wed 8/12

10:20 am-6:39 pm

1 stop23h 19m

$1,186

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 8/12

12:52 pm-6:50 am

2 stops26h 58m

Sydney Kingsford Smith

Sun 8/30

9:15 am-11:58 pm

2 stops29h 43m

$1,191

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 8/12

5:11 pm-6:55 am

1 stop22h 44m

Sydney Kingsford Smith

Sun 8/30

9:10 am-6:05 pm

2 stops23h 55m

$1,193

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 10/13

6:04 am-8:05 am

1 stop34h 01m

Sydney Kingsford Smith

Tue 10/27

7:05 am-5:02 pm

2 stops25h 57m

$1,205

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 10/24

7:10 pm-5:40 pm

2 stops30h 30m

Sydney Kingsford Smith

Tue 11/3

11:20 am-11:42 pm

1 stop29h 22m

$1,224

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Thu 8/6

3:35 pm-6:55 am

1 stop24h 20m

Sydney Kingsford Smith

Thu 8/13

12:00 pm-6:05 pm

1 stop21h 05m

$1,267

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Tue 10/13

12:47 pm-6:55 am

1 stop26h 08m

Sydney Kingsford Smith

Wed 11/18

10:20 am-11:42 pm

2 stops30h 22m

$1,277

Flights are sorted by cheapest round-trip 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

Layovers

What is the cheapest month to fly to Sydney?

In general, July is the cheapest month to fly from St. Louis to Sydney. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $1,161. If you are unable to visit Sydney during the month of July, then departing from St. Louis during the month March is also very affordable. Most momondo users find prices during this month for around $1,254.

Can stopping save me money on St. Louis to Sydney flights?

You could potentially save up to 14% on your flight if you consider stops on a St. Louis to Sydney flight.

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 round-trip 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.

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Frequently asked questions about flying from St. Louis to Sydney

How far is Lambert-St Louis to Sydney Kingsford Smith by plane?
Lambert-St Louis and Sydney Kingsford Smith are 9057.2 mi apart from one another. A reasonable flight in good conditions will take 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 are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Sydney Kingsford Smith Airport?
The number of operators available for flights from Lambert-St Louis Airport to Sydney Kingsford Smith Airport is 3 as of July 2026.
How old do you have to be to fly from Lambert-St Louis Airport to Sydney Kingsford Smith Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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 travel and health documents you'll need for your trip to Sydney Kingsford Smith Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sydney Kingsford Smith Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from St. Louis to Sydney?
Based on momondo bookings for this flight route, the most popular airline on flight routes from St. Louis to Sydney is Qantas Airways (42% of total bookings). The next most popular airlines are American Airlines (30%) and United Airlines (27%).

Best airlines flying from St. Louis to Sydney

Compare and see reviews for airlines that fly from St. Louis to Sydney with momondo

Airline	Rating	Free Cancellation	Price
Qantas Airways	PriceFrom $1,094	Free Cancellation	Rating 7.5 1,061 reviews	Search Qantas Airways flights
United Airlines	PriceFrom $1,144	Free Cancellation	Rating 7.4 9,981 reviews	Search United Airlines flights
American Airlines	PriceFrom $1,233	Free Cancellation	Rating 7.1 11,815 reviews	Search American Airlines flights

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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?

Yes. All flights to Sydney from St. Louis on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from St. Louis to Sydney?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Sydney from St. Louis.

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 not ready to book a flight from St. Louis to Sydney now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Sydney and let you know when they change.

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Cheap flights from St. Louis to Sydney from $603

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sydney departing on 8/30. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Air Canada flights from St. Louis to Sydney

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How to get the cheapest flight ticket from St. Louis to Sydney

What is the cheapest month to fly to Sydney?

Can stopping save me money on St. Louis to Sydney flights?

How have St. Louis to Sydney flight prices changed over time?

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

What airlines fly to Sydney?

Which airport is the most popular layover for flights between St. Louis and Sydney?

Which layover airport offers the lowest fares from St. Louis to Sydney?

Which layover airport has the shortest travel time from St. Louis to Sydney?

Which layover airport has the shortest connection time from St. Louis to Sydney?

When to book flights from St. Louis to Sydney

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

Direct flights

Frequently asked questions about flying from St. Louis to Sydney

Best airlines flying from St. Louis to Sydney

Compare and see reviews for airlines that fly from St. Louis to Sydney with momondo

Traveling to a place near Sydney?

Why use momondo?

An easier way to manage your Sydney trip

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List of cabin classes available on flights landing in Sydney. Availability may vary depending on flight origin and airline.

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