Cheap Flights from St. Louis (STL) to Sydney (SYD)

View AU$875 flight on Mon, 8 Dec 2025Opens in a new window

Popular airlines from Lambert-St. Louis International Airport (STL) to Sydney Airport (SYD)

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Cheap Flights from St. Louis (STL) to Sydney (SYD)

Prices were available within the past 7 days for one-way flights and round trip tickets for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Mon, 27 Oct - Mon, 10 Nov
STL
St. Louis
SYD
Sydney
AU$1,945 Return, found 12 hours ago
AU$1,945
Return
found 12 hours ago
Select American Airlines flight, departing Mon, 27 Oct from St. Louis to Sydney, returning Mon, 10 Nov, priced at AU$1,945 found 12 hours ago
American Airlines
Wed, 1 Apr - Wed, 15 Apr
STL
St. Louis
SYD
Sydney
AU$1,949 Return, found 2 days ago
AU$1,949
Return
found 2 days ago
Select American Airlines flight, departing Wed, 1 Apr from St. Louis to Sydney, returning Wed, 15 Apr, priced at AU$1,949 found 2 days ago
United
Mon, 27 Oct - Mon, 10 Nov
STL
St. Louis
SYD
Sydney
AU$1,971 Return, found 12 hours ago
AU$1,971
Return
found 12 hours ago
Select United flight, departing Mon, 27 Oct from St. Louis to Sydney, returning Mon, 10 Nov, priced at AU$1,971 found 12 hours ago
Delta
Mon, 27 Oct - Mon, 10 Nov
STL
St. Louis
SYD
Sydney
AU$1,971 Return, found 12 hours ago
AU$1,971
Return
found 12 hours ago
Select Delta flight, departing Mon, 27 Oct from St. Louis to Sydney, returning Mon, 10 Nov, priced at AU$1,971 found 12 hours ago
United
Wed, 1 Apr - Wed, 15 Apr
STL
St. Louis
SYD
Sydney
AU$1,975 Return, found 2 days ago
AU$1,975
Return
found 2 days ago
Select United flight, departing Wed, 1 Apr from St. Louis to Sydney, returning Wed, 15 Apr, priced at AU$1,975 found 2 days ago
Delta
Wed, 1 Apr - Wed, 15 Apr
STL
St. Louis
SYD
Sydney
AU$1,975 Return, found 2 days ago
AU$1,975
Return
found 2 days ago
Select Delta flight, departing Wed, 1 Apr from St. Louis to Sydney, returning Wed, 15 Apr, priced at AU$1,975 found 2 days ago
American Airlines
Mon, 27 Oct - Mon, 10 Nov
STL
St. Louis
SYD
Sydney
AU$1,981 Return, found 12 hours ago
AU$1,981
Return
found 12 hours ago
Select American Airlines flight, departing Mon, 27 Oct from St. Louis to Sydney, returning Mon, 10 Nov, priced at AU$1,981 found 12 hours ago
Qantas Airways
Mon, 27 Oct - Mon, 10 Nov
STL
St. Louis
SYD
Sydney
AU$1,993 Return, found 12 hours ago
AU$1,993
Return
found 12 hours ago
Select Qantas Airways flight, departing Mon, 27 Oct from St. Louis to Sydney, returning Mon, 10 Nov, priced at AU$1,993 found 12 hours ago
Qantas Airways
Wed, 1 Apr - Wed, 15 Apr
STL
St. Louis
SYD
Sydney
AU$1,996 Return, found 2 days ago
AU$1,996
Return
found 2 days ago
Select Qantas Airways flight, departing Wed, 1 Apr from St. Louis to Sydney, returning Wed, 15 Apr, priced at AU$1,996 found 2 days ago
Air Canada
Thu, 4 Dec - Thu, 11 Dec
STL
St. Louis
SYD
Sydney
AU$2,000 Return, found 12 hours ago
AU$2,000
Return
found 12 hours ago
Select Air Canada flight, departing Thu, 4 Dec from St. Louis to Sydney, returning Thu, 11 Dec, priced at AU$2,000 found 12 hours ago

Find the cheapest month to fly from St. Louis (STL) to Sydney (SYD)

September is typically the cheapest month to fly

From AU$1,635 - AU$2,640 per traveller.

Alternative airports near Sydney

Prices were available within the past 7 days. Prices and availability are subject to change.

Select flight to Kingsford Smith Intl. SYD. Cheapest option available. Average driving time to city centre is 16 minutes. Flights from AU$2,420
SYD
Kingsford Smith Intl.
Cheapest
Average driving time to city centre16 min
Flights from AU$2,420

Frequently asked questions

How much is a flight from Lambert Field to SYD?
If you're planning on travelling from Lambert-St. Louis Intl. Airport (STL) to SYD, round-trip flights start from AU$1,945. This price is based on airfares listed within the last 7 days on Expedia for flights departing within the next year, so don't wait around. Book today and save yourself money and time. Prices and availability are subject to change. Additional terms apply.
Do I need to pay a cancellation fee if I cancel my flight from Lambert Field to SYD?
The majority of flights can be cancelled online, but whether or not you are charged a fee depends on your airline. If you do have to cancel your getaway, follow the easy instructions in the Customer Service Portal.
How do I find cheap flights from St. Louis Lambert International Airport to Kingsford Smith Intl. Airport (SYD) that have flexible change policies?
Many airlines offer the option to reschedule your flight without a change fee. All you pay is the difference between the original flight and the new flight. When you're searching for Lambert Field to Mascot Airport flights, you'll see a "no change fees" filter for you to select.
How far is the flight from STL to Sydney Airport?
With a flight distance of 14 600 kilometres between St. Louis and Sydney, this is a long-haul trip. Ensure that you keep well hydrated and take a short walk down the aisle every now and then.
Which airlines fly direct from Lambert Field to Kingsford Smith Intl. Airport (SYD)?
Unfortunately, there are no airlines that fly direct between Lambert Field and Kingsford Smith Intl. Airport (SYD). You'll need to book a flight with one or more stops.
Are STL to Mascot Airport flight tickets cheaper when they're purchased at the last minute?
Flight prices change all the time, so not always. While last-minute flight deals between STL and Kingsford Smith Intl. Airport (SYD) are possible, it's also a good idea to keep track of prices well before you fly. In fact, some air carriers publicize their prices up to a year ahead of the departure date. Expedia is continuously updating the best bargains around, so keep checking and be ready to grab your seat when the price dips.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Kingsford Smith Intl.
Airlines serving
Air Canada, Air New Zealand, All Nippon Airways, American Airlines, British Airways, Delta, Qantas Airways, Qatar Airways, United
Return price
AU$1,944
Distance
14496 km

Book with confidence

Your quick guide to flights from St. Louis to Sydney

Pick up great flights from St. Louis to Sydney

With Expedia, you have your pick of flights a day with 20 airlines covering flights from St. Louis to Sydney. Whether you’re on a business trip, a family holiday or a luxury break, just enter your travel dates, hit search then check out your choice of flights. Select from return, one way or multi-city flights, and use the advance search tool if you want a direct or refundable flight. You can narrow your search to show you just your preferred cabin class and airline, too. It’s all easy. You can book direct flights from St. Louis to Sydney that take around hours.

Find cheap flights from St. Louis to Sydney

From the great flight deals with prices currently ranging from AU$1,945 to AU$2,000, you can choose to see the cheapest flights first. Generally, you can book the cheapest flights from St. Louis to Sydney around 4 to 6 weeks in advance. If your travel dates are flexible, try to avoid weekends and peak seasons – when you are more likely to grab the lowest prices. Even last minute, there are some impressive deals. The cheapest time to fly to Sydney is normally in October.

Reasons to book your flight from St. Louis to Sydney with Expedia

Expedia makes it easy to find, book, and travel, with everything you need all in one place. When you enter your travel details, find fantastic deals just for you on flight tickets from St. Louis to Sydney across all the main airline carriers, so you can save time, dollars, and hassle finding the perfect flight. If you think your plans could change, choose refundable flights so any changes won’t cost you more. Book your flight to Sydney right now and, if you join Expedia Rewards, you earn points this time and every time you travel with Expedia.

Your quick guide to flights from St. Louis to Sydney

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