$826 Cheap Flights from St. Louis (STL) to Perth (PER)

View $826 flight on Mon, Feb 16, 2026Opens in a new window

Popular airlines from St. Louis Lambert Intl. Airport (STL) to Perth Airport (PER)

Cheap Flights from St. Louis to Perth (STL-PER)

Prices were available within the past 7 days and start at $826 for one-way flights and $1,485 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

American Airlines
Sun, Nov 16 - Fri, Nov 21
STL
St. Louis
PER
Perth
$1,485 Roundtrip, found 3 days ago
$1,485
Roundtrip
found 3 days ago
Select American Airlines flight, departing Sun, Nov 16 from St. Louis to Perth, returning Fri, Nov 21, priced at $1,485 found 3 days ago
Cathay Pacific
Mon, Nov 24 - Wed, Dec 3
STL
St. Louis
PER
Perth
$1,500 Roundtrip, found 1 day ago
$1,500
Roundtrip
found 1 day ago
Select Cathay Pacific flight, departing Mon, Nov 24 from St. Louis to Perth, returning Wed, Dec 3, priced at $1,500 found 1 day ago
Cathay Pacific
Fri, Nov 14 - Fri, Nov 21
STL
St. Louis
PER
Perth
$1,504 Roundtrip, found 3 days ago
$1,504
Roundtrip
found 3 days ago
Select Cathay Pacific flight, departing Fri, Nov 14 from St. Louis to Perth, returning Fri, Nov 21, priced at $1,504 found 3 days ago
Air Canada
Mon, Nov 24 - Wed, Dec 3
STL
St. Louis
PER
Perth
$1,526 Roundtrip, found 1 day ago
$1,526
Roundtrip
found 1 day ago
Select Air Canada flight, departing Mon, Nov 24 from St. Louis to Perth, returning Wed, Dec 3, priced at $1,526 found 1 day ago
Air Canada
Mon, Nov 24 - Wed, Dec 3
STL
St. Louis
PER
Perth
$1,541 Roundtrip, found 1 day ago
$1,541
Roundtrip
found 1 day ago
Select Air Canada flight, departing Mon, Nov 24 from St. Louis to Perth, returning Wed, Dec 3, priced at $1,541 found 1 day ago
Air Canada
Mon, Nov 24 - Wed, Dec 3
STL
St. Louis
PER
Perth
$1,550 Roundtrip, found 1 day ago
$1,550
Roundtrip
found 1 day ago
Select Air Canada flight, departing Mon, Nov 24 from St. Louis to Perth, returning Wed, Dec 3, priced at $1,550 found 1 day ago
Air Canada
Mon, Nov 24 - Wed, Dec 3
STL
St. Louis
PER
Perth
$1,565 Roundtrip, found 1 day ago
$1,565
Roundtrip
found 1 day ago
Select Air Canada flight, departing Mon, Nov 24 from St. Louis to Perth, returning Wed, Dec 3, priced at $1,565 found 1 day ago
Cathay Pacific
Mon, Nov 24 - Wed, Dec 3
STL
St. Louis
PER
Perth
$1,575 Roundtrip, found 1 day ago
$1,575
Roundtrip
found 1 day ago
Select Cathay Pacific flight, departing Mon, Nov 24 from St. Louis to Perth, returning Wed, Dec 3, priced at $1,575 found 1 day ago
Alaska Airlines
Thu, Nov 13 - Mon, Nov 17
STL
St. Louis
PER
Perth
$1,577 Roundtrip, found 4 days ago
$1,577
Roundtrip
found 4 days ago
Select Alaska Airlines flight, departing Thu, Nov 13 from St. Louis to Perth, returning Mon, Nov 17, priced at $1,577 found 4 days ago
Qatar Airways
Thu, Feb 12 - Thu, Feb 26
STL
St. Louis
PER
Perth
$1,580 Roundtrip, found 6 hours ago
$1,580
Roundtrip
found 6 hours ago
Select Qatar Airways flight, departing Thu, Feb 12 from St. Louis to Perth, returning Thu, Feb 26, priced at $1,580 found 6 hours ago

Alternative airports near Perth

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

Select flight to Perth Airport PER. Cheapest and Closest option available. Average driving time to city center is 14 minutes. Flights from $1,485
PER
Perth Airport
CheapestClosest
Average driving time to city center14 min
Flights from $1,485

Frequently asked questions

How much does a flight from Lambert-St. Louis Intl. Airport (STL) to Perth Airport (PER) cost?
Lock in a cheap one-way flight from $826 or cheap return flight from $1,485 from Lambert-St. Louis Intl. Airport (STL) to Perth Airport (PER) 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 Perth Airport (PER)?
November is the least expensive month to fly from STL to PER. Traveling during quieter months is often the key to better flight prices.
What is the cheapest airline that flies from Lambert-St. Louis Intl. Airport (STL) to Perth Airport (PER)?
To find the cheapest airline flying from STL to PER, use Expedia's filter tool. Customize your search based on your travel style, such as preferred carriers and seat class. You can then sort your results by "Price (lowest to highest)" to see the cheapest fares upfront.
How many flights per day from Lambert-St. Louis Intl. Airport (STL) to Perth Airport (PER)?
You'll need to book a flight with a layover when traveling from Lambert-St. Louis Intl. Airport (STL) to Perth Airport (PER). There are no daily direct flights on this route. However, just filter your search to include one or two stops to find the best option for your trip.
What day of the week has the most flights from STL to PER?
Friday is usually the busiest day for flights, while Tuesday is often the quietest.* Remember that flight schedules can vary based on a range of factors, including the time of year and carrier.*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 Perth Airport (PER)?
To arrive at Perth Airport (PER) on schedule, choose a flight that leaves Lambert-St. Louis Intl. Airport (STL) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this time.**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 Perth Airport (PER) last-minute?
Last-minute bookings from STL to PER are typically more expensive. For the best rates, start searching for flights well ahead of time. That said, if you can play around with your travel dates, it's possible to find a cheap fare right before your journey.
Is it cheaper to book a STL to PER flight and hotel package?
Compared with arranging flights and hotels separately, booking a STL to PER flight and hotel package with Expedia could lead to significant savings. Better still, having it all in one place will take the stress out of planning your trip. Just secure your flights and choose from our extensive range of stays, then personalize your trip with other add-ons like tours, activities and car rentals.
Can I cancel or change the date of my flight from Lambert-St. Louis Intl. Airport (STL) to Perth Airport (PER)?
In most cases, you can reschedule or cancel your STL to PER flight. However, additional charges may apply, especially if you booked more than 24 hours ago. Check your itinerary for the airline's fees and guidelines on flight changes, or if you want further details, head to our Customer Service portal.

Travel information

Origin airport
Lambert-St. Louis Intl.
Destination airport
Perth
Roundtrip price
$1,485
Distance
10885 mi

Book with confidence

St. Louis to Perth Flights

The cheapest times to fly from St. Louis to Perth

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 St. Louis to Perth are during the month of November. You can find some of the cheapest flights from St. Louis to Perth with Expedia's search tool and vast selection of airlines.

 

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

Sunday is one of the best days to book for cheap flights from St. Louis to Perth: 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 St. Louis to Perth

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 St. Louis to Perth in 2025. You can also book with separate airlines for your outbound and return journeys, from $826 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 St. Louis to Perth 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 St. Louis to Perth 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.

 

St. Louis to Perth Flights

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*Available to One Key members.