$799 Cheap Flights from Sydney (SYD) to St. Louis (STL)

View $799 flight on Wed, Mar 11, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $799 for one-way flights and $1,267 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

Air Canada
Tue, Jan 27 - Tue, Mar 24
SYD
Sydney
STL
St. Louis
$1,267 Roundtrip, found 8 hours ago
$1,267
Roundtrip
found 8 hours ago
Select Air Canada flight, departing Tue, Jan 27 from Sydney to St. Louis, returning Tue, Mar 24, priced at $1,267 found 8 hours ago
Air Canada
Tue, Jan 27 - Tue, Mar 24
SYD
Sydney
STL
St. Louis
$1,326 Roundtrip, found 8 hours ago
$1,326
Roundtrip
found 8 hours ago
Select Air Canada flight, departing Tue, Jan 27 from Sydney to St. Louis, returning Tue, Mar 24, priced at $1,326 found 8 hours ago
American Airlines
Tue, Jan 27 - Tue, Mar 24
SYD
Sydney
STL
St. Louis
$1,365 Roundtrip, found 8 hours ago
$1,365
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Tue, Jan 27 from Sydney to St. Louis, returning Tue, Mar 24, priced at $1,365 found 8 hours ago
Air Canada
Sun, Feb 22 - Mon, Mar 2
SYD
Sydney
STL
St. Louis
$1,367 Roundtrip, found 2 days ago
$1,367
Roundtrip
found 2 days ago
Select Air Canada flight, departing Sun, Feb 22 from Sydney to St. Louis, returning Mon, Mar 2, priced at $1,367 found 2 days ago
American Airlines
Tue, Jan 27 - Tue, Mar 24
SYD
Sydney
STL
St. Louis
$1,372 Roundtrip, found 8 hours ago
$1,372
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Tue, Jan 27 from Sydney to St. Louis, returning Tue, Mar 24, priced at $1,372 found 8 hours ago
American Airlines
Tue, Jan 27 - Tue, Mar 24
SYD
Sydney
STL
St. Louis
$1,377 Roundtrip, found 8 hours ago
$1,377
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Tue, Jan 27 from Sydney to St. Louis, returning Tue, Mar 24, priced at $1,377 found 8 hours ago
United
Tue, Jan 27 - Tue, Mar 24
SYD
Sydney
STL
St. Louis
$1,378 Roundtrip, found 8 hours ago
$1,378
Roundtrip
found 8 hours ago
Select United flight, departing Tue, Jan 27 from Sydney to St. Louis, returning Tue, Mar 24, priced at $1,378 found 8 hours ago
American Airlines
Tue, Jan 27 - Tue, Mar 24
SYD
Sydney
STL
St. Louis
$1,379 Roundtrip, found 8 hours ago
$1,379
Roundtrip
found 8 hours ago
Select American Airlines flight, departing Tue, Jan 27 from Sydney to St. Louis, returning Tue, Mar 24, priced at $1,379 found 8 hours ago
Delta
Tue, Jan 27 - Tue, Mar 24
SYD
Sydney
STL
St. Louis
$1,383 Roundtrip, found 8 hours ago
$1,383
Roundtrip
found 8 hours ago
Select Delta flight, departing Tue, Jan 27 from Sydney to St. Louis, returning Tue, Mar 24, priced at $1,383 found 8 hours ago
Jetstar
Sun, Feb 22 - Mon, Mar 2
SYD
Sydney
STL
St. Louis
$1,395 Roundtrip, found 2 days ago
$1,395
Roundtrip
found 2 days ago
Select Jetstar flight, departing Sun, Feb 22 from Sydney to St. Louis, returning Mon, Mar 2, priced at $1,395 found 2 days ago

Alternative airports near St. Louis

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

Select flight to Lambert-St. Louis Intl. STL. Cheapest option available. Average driving time to city center is 20 minutes. Flights from $1,703
STL
Lambert-St. Louis Intl.
Cheapest
Average driving time to city center20 min
Flights from $1,703

Frequently asked questions

How much does a flight from Kingsford Smith Intl. Airport (SYD) to Lambert-St. Louis Intl. Airport (STL) cost?
Lock in a cheap one-way flight from $799 or cheap return flight from $1,267 from Kingsford Smith Intl. Airport (SYD) to Lambert-St. Louis Intl. Airport (STL) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight deals on this route.
What is the cheapest month to fly from Kingsford Smith Intl. Airport (SYD) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from SYD to STL is January, when there's less demand. Off-peak season is often when airlines offer better prices between these airports.
What is the cheapest airline that flies from Kingsford Smith Intl. Airport (SYD) to Lambert-St. Louis Intl. Airport (STL)?
Expedia's filter tool lets you easily compare airlines, flight times and baggage options all in one place. Select your preferences, then sort by "Price (lowest to highest)" to see which carrier offers the cheapest SYD to STL flight.
How many flights per day from Kingsford Smith Intl. Airport (SYD) to Lambert-St. Louis Intl. Airport (STL)?
Nonstop flights from Kingsford Smith Intl. Airport (SYD) to Lambert-St. Louis Intl. Airport (STL) aren't available daily, so you'll have to take a flight with a layover. Explore your options with Expedia's filter tool. Enter your travel dates and select either "1 Stop" or "2+ Stops."
What day of the week has the most flights from SYD to STL?
Friday is generally the busiest day for flights, while Tuesday is often the quietest.* Just remember that flight schedules can change based on a range of factors, including the carrier and season.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Kingsford Smith Intl. Airport (SYD) to Lambert-St. Louis Intl. Airport (STL)?
To reach Lambert-St. Louis Intl. Airport (STL) on time, book a flight that takes off from Kingsford Smith Intl. Airport (SYD) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**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 Kingsford Smith Intl. Airport (SYD) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Holding off until just before your departure to book a ticket from SYD to STL often results in higher prices. While you might find some last-minute discounts, there's no guarantee. Be flexible with your travel plans for the best chance of getting a bargain.
Is it cheaper to book a SYD to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking a SYD to STL flight and hotel package with Expedia could result in significant savings. Better yet, managing everything in one place will take the hassle out of planning your trip. Simply secure your flights and select from our extensive range of stays, then tailor your trip with extras like tours, car rentals and activities.
Can I cancel or change the date of my flight from Kingsford Smith Intl. Airport (SYD) to Lambert-St. Louis Intl. Airport (STL)?
Usually, it's possible to cancel or reschedule your SYD to STL flight. However, if it's been more than 24 hours since booking, additional charges may apply. Check your airline's policies in your itinerary to see what changes are possible and whether any costs are involved. You'll also find more information on our Customer Service portal.

Travel information

Travel information

Origin airport
Kingsford Smith Intl.
Destination airport
Lambert-St. Louis Intl.
Airlines serving
Air Canada, Air New Zealand, All Nippon Airways, American Airlines, Cathay Pacific, Japan Airlines, Qantas Airways, Qatar Airways, United
Roundtrip price
$1,267
Distance
9060 mi

Book with confidence

Book with confidence

Sydney to St. Louis Flights

The cheapest times to fly from Sydney to St. Louis

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Sydney to St. Louis are during the month of January. You can find some of the cheapest flights from Sydney to St. Louis with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Sydney to St. Louis

Sunday is one of the best days to book for cheap flights from Sydney to St. Louis: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Sydney to St. Louis

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Sydney to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $799 one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Sydney to St. Louis flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Sydney to St. Louis airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Sydney to St. Louis Flights

Explore a world of travel with Expedia

Explore a world of travel with Expedia

*Available to One Key members.