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

View AU$1,279 flight on Mon, 5 May 2025Opens in a new window

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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.

Air Canada
Tue., 10 Jun. - Wed., 9 Jul.
STL
St. Louis
SYD
Sydney
AU$2,129 Return, found 2 hours ago
AU$2,129
Return
found 2 hours ago
Select Air Canada flight, departing Tue., 10 Jun. from St. Louis to Sydney, returning Wed., 9 Jul., priced at AU$2,129 found 2 hours ago
Air Canada
Tue., 10 Jun. - Wed., 9 Jul.
STL
St. Louis
SYD
Sydney
AU$2,137 Return, found 2 hours ago
AU$2,137
Return
found 2 hours ago
Select Air Canada flight, departing Tue., 10 Jun. from St. Louis to Sydney, returning Wed., 9 Jul., priced at AU$2,137 found 2 hours ago
Air Canada
Sun., 1 Jun. - Wed., 16 Jul.
STL
St. Louis
SYD
Sydney
AU$2,154 Return, found 6 days ago
AU$2,154
Return
found 6 days ago
Select Air Canada flight, departing Sun., 1 Jun. from St. Louis to Sydney, returning Wed., 16 Jul., priced at AU$2,154 found 6 days ago
Air Canada
Sun., 1 Jun. - Wed., 16 Jul.
STL
St. Louis
SYD
Sydney
AU$2,164 Return, found 6 days ago
AU$2,164
Return
found 6 days ago
Select Air Canada flight, departing Sun., 1 Jun. from St. Louis to Sydney, returning Wed., 16 Jul., priced at AU$2,164 found 6 days ago
Air Canada
Sun., 8 Jun. - Tue., 8 Jul.
STL
St. Louis
SYD
Sydney
AU$2,174 Return, found 5 days ago
AU$2,174
Return
found 5 days ago
Select Air Canada flight, departing Sun., 8 Jun. from St. Louis to Sydney, returning Tue., 8 Jul., priced at AU$2,174 found 5 days ago
American Airlines
Tue., 10 Jun. - Wed., 9 Jul.
STL
St. Louis
SYD
Sydney
AU$2,271 Return, found 2 hours ago
AU$2,271
Return
found 2 hours ago
Select American Airlines flight, departing Tue., 10 Jun. from St. Louis to Sydney, returning Wed., 9 Jul., priced at AU$2,271 found 2 hours ago
Air Canada
Sat., 5 Jul. - Mon., 4 Aug.
STL
St. Louis
SYD
Sydney
AU$2,280 Return, found 15 hours ago
AU$2,280
Return
found 15 hours ago
Select Air Canada flight, departing Sat., 5 Jul. from St. Louis to Sydney, returning Mon., 4 Aug., priced at AU$2,280 found 15 hours ago
United
Tue., 10 Jun. - Wed., 9 Jul.
STL
St. Louis
SYD
Sydney
AU$2,295 Return, found 2 hours ago
AU$2,295
Return
found 2 hours ago
Select United flight, departing Tue., 10 Jun. from St. Louis to Sydney, returning Wed., 9 Jul., priced at AU$2,295 found 2 hours ago
Delta
Tue., 10 Jun. - Wed., 9 Jul.
STL
St. Louis
SYD
Sydney
AU$2,310 Return, found 2 hours ago
AU$2,310
Return
found 2 hours ago
Select Delta flight, departing Tue., 10 Jun. from St. Louis to Sydney, returning Wed., 9 Jul., priced at AU$2,310 found 2 hours ago
Qantas Airways
Tue., 10 Jun. - Wed., 9 Jul.
STL
St. Louis
SYD
Sydney
AU$2,430 Return, found 2 hours ago
AU$2,430
Return
found 2 hours ago
Select Qantas Airways flight, departing Tue., 10 Jun. from St. Louis to Sydney, returning Wed., 9 Jul., priced at AU$2,430 found 2 hours ago
Flight from St. Louis to Sydney route information
Origin airport
Lambert-St. Louis Intl.
Destination airport
Kingsford Smith Intl.
Airlines serving
Air Canada, Air New Zealand, American Airlines, Cathay Pacific, Delta, Korean Air, Qantas Airways, Qatar Airways, United
Return price
AU$2,128
Distance
14496 km

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$2,129 to AU$2,430, 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 June.

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.

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$2,129. 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.
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