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

Qantas Airways, Delta, and EVA Air are the most popular carriers operating from Lambert-St Louis to Sydney Kingsford Smith

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 42% of people opting to fly with this airline when traveling to Sydney. Keep in mind that there are 4 different airlines that fly to Sydney on a routine basis, so you have a few additional options to choose from.

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 4 as of May 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.

$668 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 $1,600 to $1,292. The lowest price recently found on this route was $1,293.

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5:11 pm - 8:00 am

STL

SYD

23h 49m

2 stops

11:05 am - 6:14 pm

SYD

STL

23h 09m

2 stops

$1,293Qantas Airways

Wed, Sep 23 - Wed, Oct 7

5:11 pm - 8:00 am

STL

SYD

23h 49m

2 stops

10:30 am - 6:14 pm

SYD

STL

23h 44m

2 stops

$1,294Qantas Airways

Wed, Sep 23 - Wed, Oct 7

5:10 am - 7:20 am

STL

SYD

35h 10m

2 stops

9:20 am - 11:57 pm

SYD

STL

53h 37m

2 stops

$1,311Air Canada

Wed, Jun 10 - Wed, Jun 17

6:30 am - 10:25 pm

STL

SYD

48h 55m

2 stops

9:35 am - 6:14 pm

SYD

STL

24h 39m

2 stops

$1,330Qantas Airways

Wed, Sep 23 - Wed, Oct 7

7:23 pm - 6:55 am

STL

SYD

20h 32m

1 stop

10:20 am - 6:17 pm

SYD

STL

22h 57m

1 stop

$1,331United Airlines

Wed, Jun 10 - Wed, Jun 17

1:13 pm - 6:55 am

STL

SYD

26h 42m

2 stops

10:20 am - 4:33 pm

SYD

STL

21h 13m

2 stops

$1,335Air New Zealand

Wed, Jun 10 - Wed, Jun 17

11:25 am - 7:00 am

STL

SYD

28h 35m

2 stops

10:20 am - 6:17 pm

SYD

STL

22h 57m

1 stop

$1,336United Airlines

Wed, Jul 1 - Sun, Jul 19

7:21 pm - 10:30 am

STL

SYD

48h 09m

2 stops

8:00 pm - 6:10 pm

SYD

STL

37h 10m

2 stops

$1,338Qantas Airways

Fri, Jul 31 - Sun, Aug 9

4:40 pm - 7:00 am

STL

SYD

47h 20m

2 stops

9:30 am - 4:34 pm

SYD

STL

22h 04m

2 stops

$1,351Air New Zealand

Sat, Aug 22 - Tue, Sep 8

5:10 am - 7:20 am

STL

SYD

35h 10m

2 stops

9:20 am - 11:57 pm

SYD

STL

29h 37m

2 stops

$1,364Air Canada

Wed, Jul 22 - Wed, Jul 29

Qantas Airways flights from St. Louis to Sydney

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

Qantas Airways

Sep 23

STL5:11 pmLambert-St Louis

23h 49m

2 stops

SYD8:00 amSydney Kingsford Smith

Oct 7

SYD11:05 amSydney Kingsford Smith

23h 09m

2 stops

STL6:14 pmLambert-St Louis

$1,293

Qantas Airways

Sep 23

STL5:11 pmLambert-St Louis

23h 49m

2 stops

SYD8:00 amSydney Kingsford Smith

Oct 7

SYD10:30 amSydney Kingsford Smith

23h 44m

2 stops

STL6:14 pmLambert-St Louis

$1,294

Qantas Airways

Sep 23

STL6:30 amLambert-St Louis

48h 55m

2 stops

SYD10:25 pmSydney Kingsford Smith

Oct 7

SYD9:35 amSydney Kingsford Smith

24h 39m

2 stops

STL6:14 pmLambert-St Louis

$1,330

American Airlines flights from St. Louis to Sydney

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

American Airlines

Jul 31

STL2:46 pmLambert-St Louis

25h 19m

2 stops

SYD7:05 amSydney Kingsford Smith

Aug 9

SYD5:50 pmSydney Kingsford Smith

20h 05m

1 stop

STL10:55 pmLambert-St Louis

$1,402

American Airlines

Jul 22

STL2:46 pmLambert-St Louis

25h 19m

2 stops

SYD7:05 amSydney Kingsford Smith

Jul 29

SYD12:00 pmSydney Kingsford Smith

24h 21m

2 stops

STL9:21 pmLambert-St Louis

$1,502

American Airlines

Jul 22

STL6:37 amLambert-St Louis

33h 28m

1 stop

SYD7:05 amSydney Kingsford Smith

Jul 29

SYD12:00 pmSydney Kingsford Smith

26h 58m

1 stop

STL11:58 pmLambert-St Louis

$1,510

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 9/23

5:11 pm-8:00 am

2 stops23h 49m

Sydney Kingsford Smith

Wed 10/7

11:05 am-6:14 pm

2 stops23h 09m

$1,293

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 9/23

5:11 pm-8:00 am

2 stops23h 49m

Sydney Kingsford Smith

Wed 10/7

10:30 am-6:14 pm

2 stops23h 44m

$1,294

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 6/10

5:10 am-7:20 am

2 stops35h 10m

Sydney Kingsford Smith

Wed 6/17

9:20 am-11:57 pm

2 stops53h 37m

$1,311

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 9/23

6:30 am-10:25 pm

2 stops48h 55m

Sydney Kingsford Smith

Wed 10/7

9:35 am-6:14 pm

2 stops24h 39m

$1,330

Quickest round-trip

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 6/10

7:23 pm-6:55 am

1 stop20h 32m

Sydney Kingsford Smith

Wed 6/17

10:20 am-6:17 pm

1 stop22h 57m

$1,331

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 6/10

1:13 pm-6:55 am

2 stops26h 42m

Sydney Kingsford Smith

Wed 6/17

10:20 am-4:33 pm

2 stops21h 13m

$1,335

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 7/1

11:25 am-7:00 am

2 stops28h 35m

Sydney Kingsford Smith

Sun 7/19

10:20 am-6:17 pm

1 stop22h 57m

$1,336

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Fri 7/31

7:21 pm-10:30 am

2 stops48h 09m

Sydney Kingsford Smith

Sun 8/9

8:00 pm-6:10 pm

2 stops37h 10m

$1,338

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Sat 8/22

4:40 pm-7:00 am

2 stops47h 20m

Sydney Kingsford Smith

Tue 9/8

9:30 am-4:34 pm

2 stops22h 04m

$1,351

St. LouisSydney

STL - SYD

STLSYD

Lambert-St Louis

Wed 7/22

5:10 am-7:20 am

2 stops35h 10m

Sydney Kingsford Smith

Wed 7/29

9:20 am-11:57 pm

2 stops29h 37m

$1,364

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 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?

In general, March 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 $1,233. If you are unable to visit Sydney during the month of March, then departing from St. Louis during the month January is also very affordable. Most momondo users find prices during this month for around $1,238.

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

You could potentially save up to 25% 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	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

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 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 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 4 as of May 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 United Airlines (27%), American Airlines (20%), and Fiji Airways (12%).

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
Fiji Airways	PriceFrom $887	Free Cancellation	Rating 8.1 242 reviews	Search Fiji Airways flights
United Airlines	PriceFrom $1,079	Free Cancellation	Rating 7.4 9,749 reviews	Search United Airlines flights
Qantas Airways	PriceFrom $1,094	Free Cancellation	Rating 7.5 1,042 reviews	Search Qantas Airways flights
American Airlines	PriceFrom $1,233	Free Cancellation	Rating 7.1 11,629 reviews	Search American Airlines flights

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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?

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 $668

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 6/2. 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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Qantas Airways 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 typical price of a round-trip flight between St. Louis and 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?

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

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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?

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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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