$957 Cheap Flights from Perth (PER) to St. Louis (STL)

View $957 flight on Wed, Feb 4, 2026Opens in a new window

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

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

Prices were available within the past 7 days and start at $957 for one-way flights and $1,597 for round trip, for the period specified. Prices and availability are subject to change. Additional terms apply.

All Nippon Airways
Tue, Mar 10 - Tue, Mar 17
PER
Perth
STL
St. Louis
$1,597 Roundtrip, found 6 days ago
$1,597
Roundtrip
found 6 days ago
Select All Nippon Airways flight, departing Tue, Mar 10 from Perth to St. Louis, returning Tue, Mar 17, priced at $1,597 found 6 days ago
All Nippon Airways
Tue, Mar 10 - Tue, Mar 17
PER
Perth
STL
St. Louis
$1,603 Roundtrip, found 6 days ago
$1,603
Roundtrip
found 6 days ago
Select All Nippon Airways flight, departing Tue, Mar 10 from Perth to St. Louis, returning Tue, Mar 17, priced at $1,603 found 6 days ago
All Nippon Airways
Tue, Mar 10 - Tue, Mar 17
PER
Perth
STL
St. Louis
$1,663 Roundtrip, found 6 days ago
$1,663
Roundtrip
found 6 days ago
Select All Nippon Airways flight, departing Tue, Mar 10 from Perth to St. Louis, returning Tue, Mar 17, priced at $1,663 found 6 days ago
All Nippon Airways
Tue, Mar 10 - Tue, Mar 17
PER
Perth
STL
St. Louis
$1,669 Roundtrip, found 6 days ago
$1,669
Roundtrip
found 6 days ago
Select All Nippon Airways flight, departing Tue, Mar 10 from Perth to St. Louis, returning Tue, Mar 17, priced at $1,669 found 6 days ago
Qatar Airways
Tue, Mar 10 - Tue, Mar 17
PER
Perth
STL
St. Louis
$1,798 Roundtrip, found 6 days ago
$1,798
Roundtrip
found 6 days ago
Select Qatar Airways flight, departing Tue, Mar 10 from Perth to St. Louis, returning Tue, Mar 17, priced at $1,798 found 6 days ago
Qatar Airways
Tue, Mar 10 - Tue, Mar 17
PER
Perth
STL
St. Louis
$1,809 Roundtrip, found 6 days ago
$1,809
Roundtrip
found 6 days ago
Select Qatar Airways flight, departing Tue, Mar 10 from Perth to St. Louis, returning Tue, Mar 17, priced at $1,809 found 6 days ago
Qatar Airways
Tue, Mar 10 - Tue, Mar 17
PER
Perth
STL
St. Louis
$1,813 Roundtrip, found 6 days ago
$1,813
Roundtrip
found 6 days ago
Select Qatar Airways flight, departing Tue, Mar 10 from Perth to St. Louis, returning Tue, Mar 17, priced at $1,813 found 6 days ago
Air New Zealand
Tue, Mar 10 - Tue, Mar 17
PER
Perth
STL
St. Louis
$1,889 Roundtrip, found 6 days ago
$1,889
Roundtrip
found 6 days ago
Select Air New Zealand flight, departing Tue, Mar 10 from Perth to St. Louis, returning Tue, Mar 17, priced at $1,889 found 6 days ago
Jetstar
Tue, Mar 10 - Tue, Mar 17
PER
Perth
STL
St. Louis
$1,963 Roundtrip, found 6 days ago
$1,963
Roundtrip
found 6 days ago
Select Jetstar flight, departing Tue, Mar 10 from Perth to St. Louis, returning Tue, Mar 17, priced at $1,963 found 6 days ago
United
Tue, Mar 10 - Tue, Mar 17
PER
Perth
STL
St. Louis
$1,966 Roundtrip, found 6 days ago
$1,966
Roundtrip
found 6 days ago
Select United flight, departing Tue, Mar 10 from Perth to St. Louis, returning Tue, Mar 17, priced at $1,966 found 6 days ago
Flights from Perth (PER) to St. Louis (STL)
Origin airport
Perth
Destination airport
Lambert-St. Louis Intl.
Roundtrip price
$1,596
Distance
10885 mi

Perth to St. Louis Flights

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

 

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

Sunday is one of the best days to book for cheap flights from Perth 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 Perth 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 Perth to St. Louis in 2025. You can also book with separate airlines for your outbound and return journeys, from $957 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 Perth 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 Perth 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.

 

Frequently asked questions

How much does a flight from Perth Airport (PER) to Lambert-St. Louis Intl. Airport (STL) cost?
Grab a cheap one-way flight from $957 or cheap return flight from $1,597 from Perth Airport (PER) to Lambert-St. Louis Intl. Airport (STL) 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 Perth Airport (PER) to Lambert-St. Louis Intl. Airport (STL)?
The cheapest month to fly from PER to STL is March, when demand is low. Off-peak months are generally when airlines offer better prices between these airports.
What is the cheapest airline that flies from Perth Airport (PER) to Lambert-St. Louis Intl. Airport (STL)?
Use the filters on Expedia to compare airlines and find the cheapest carrier that'll fly you from PER to STL. Then, sort your results by "Price (lowest to highest)" to snag a great deal.
How many flights per day from Perth Airport (PER) to Lambert-St. Louis Intl. Airport (STL)?
There are no daily direct flights departing from Perth Airport (PER) to Lambert-St. Louis Intl. Airport (STL). But you can choose flights with layovers. Filter your search on Expedia to include one or more stops, and you'll be on your way in no time at all.
What day of the week has the most flights from PER to STL?
Usually you'll have the most choice when it comes to flights on a Friday. Tuesdays tend to be the quietest.* However, this can vary based on the airline, time of year 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 Perth Airport (PER) to Lambert-St. Louis Intl. Airport (STL)?
Opt for a flight from Perth Airport (PER) to Lambert-St. Louis Intl. Airport (STL) that leaves before 3 PM to reduce the risk of cancellations and delays. Later departures 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 Perth Airport (PER) to Lambert-St. Louis Intl. Airport (STL) last-minute?
Last-minute bookings from PER to STL are generally more expensive. For the best prices, start looking for flights well in advance. That being said, if you can play around with your travel dates, it's possible to land a cheap fare just before your departure.
Is it cheaper to book a PER to STL flight and hotel package?
Compared with arranging hotels and flights separately, booking a PER to STL flight and hotel package with Expedia could lead to significant savings. What's more, having it all in one place will take the hassle out of travel planning. Simply pick your flights and choose from our extensive range of stays, then personalize your trip with extras like activities and car rentals.
Can I cancel or change the date of my flight from Perth Airport (PER) to Lambert-St. Louis Intl. Airport (STL)?
Typically, you can modify or cancel your PER to STL flight. However, additional fees may apply, especially if your booking was made over 24 hours ago. Double-check your itinerary for the airline's policies and fees on flight changes, or if you'd like further information, head to our Customer Service portal.

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*Available to One Key members.