$562 Cheap Flights from St. Louis (STL) to Sydney (SYD)

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

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

Prices were available within the past 7 days and start at $562 for one-way flights and $1,141 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Air Canada
Air Canada
Air Canada
Hawaiian Airlines
Air Canada
American Airlines
United
Delta
All Nippon Airways

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

September is typically the cheapest month to fly

From $1,081 - $1,746 per traveler.

Alternative airports near Sydney

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

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Kingsford Smith Intl. Airport (SYD) cost?
Secure a cheap one-way flight from $562 or cheap return flight from $1,141 from Lambert-St. Louis Intl. Airport (STL) to Kingsford Smith Intl. Airport (SYD) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to see our cheapest flight deals on this route.
What is the cheapest month to fly from Lambert-St. Louis Intl. Airport (STL) to Kingsford Smith Intl. Airport (SYD)?
Planning your trip for May is a good way to save, as it's the cheapest month for flights between STL and SYD. You'll usually find the lowest prices during the off-season.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Kingsford Smith Intl. Airport (SYD)?
Expedia's filter tool lets you easily compare different airlines, travel time and fares all in one place. Select your preferences, then sort by "Price (lowest to highest)" to find out which carrier offers the cheapest STL to SYD flight.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Kingsford Smith Intl. Airport (SYD)?
Direct flights from Lambert-St. Louis Intl. Airport (STL) to Kingsford Smith Intl. Airport (SYD) aren't available daily, so you'll need to take a flight with a layover. Explore your options with our filter tool. Enter your dates and click on either "1 Stop" or "2+ Stops."
What day of the week has the most flights from STL to SYD?
Generally you'll find the greatest selection of flight options on a Friday. Tuesdays tend to be the quietest.* But this can vary based on the time of year, carrier and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Lambert-St. Louis Intl. Airport (STL) to Kingsford Smith Intl. Airport (SYD)?
Select a flight from Lambert-St. Louis Intl. Airport (STL) to Kingsford Smith Intl. Airport (SYD) that leaves before 3 PM to reduce the likelihood of delays. Departures later than this have a 22% higher chance of being canceled, on average.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Lambert-St. Louis Intl. Airport (STL) to Kingsford Smith Intl. Airport (SYD) last-minute?
Booking your plane ticket from STL to SYD shortly before your trip is generally more expensive. But if there's some wiggle room with your departure dates and times, you could snag a cheap last-minute fare.
Is it cheaper to book a STL to SYD flight and hotel package?
You'll generally save money by booking a STL to SYD flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's simple to manage it all in one convenient place. After choosing your preferred accommodations and flights, consider adding extras including car rentals, activities and tours.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Kingsford Smith Intl. Airport (SYD)?
In most cases, you can reschedule or cancel your STL to SYD flight. However, there may be additional charges, especially if your booking was made more than 24 hours ago. Double-check your itinerary for the airline's guidelines and fees on flight changes, or if you'd like further information, head to our Customer Service portal.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Kingsford Smith Intl.
Airlines serving
Air Canada, Air New Zealand, Alaska Airlines, All Nippon Airways, American Airlines, Asiana Airlines, British Airways, Cathay Pacific, Delta, Hawaiian Airlines, Japan Airlines, Lufthansa, Qantas Airways, Qatar Airways, Turkish Airlines, United
Roundtrip price
$1,141
Distance
9060 mi

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