HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Perth

$792+ Cheap flights from St. Louis (STL) to Perth (PER)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/15. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PER
Aug 2 — Aug 91
Sat 8/2
Sat 8/9
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Perth with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from St. Louis to Perth

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Perth (PER). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 28, 2025.

Round-trip from

$1,477
(oojo)

One-way from

$792
(Air Canada)
From Lambert-St Louis to Perth
Search Deals
One-way flight from Lambert-St Louis to Perth
Search Deals

Find flight deals from St. Louis to Perth

Cheapest flights from St. Louis to Perth
Explore the most affordable flight options available from St. Louis to Perth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 28, 2025.

This oojo deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/97:23 amSTL - PER
2 stops39h 32mQatar Airways
Tue 9/1610:45 pmPER - STL
2 stops34h 47mQatar Airways
Deal found 7/25$1,477
This Air Canada deal was found by Cheapflights users on 7/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/99:15 amSTL - PER
3 stops47h 15mAir Canada
Tue 9/1611:55 pmPER - STL
3 stops52h 23mAir Canada
Deal found 7/25$1,478
This Orbitz deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/277:23 amSTL - PER
2 stops39h 32mMultiple Airlines
Wed 9/33:30 pmPER - STL
3 stops60h 48mMultiple Airlines
Deal found 7/28$1,539
This Ovago deal was found by Cheapflights users on 7/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/276:45 amSTL - PER
2 stops36h 00mCathay Pacific
Tue 9/212:10 amPER - STL
2 stops33h 22mCathay Pacific
Deal found 7/28$1,816

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Perth that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 28, 2025.
Use the filters below to find and compare flights from St. Louis to Perth that are best for you.

Fly from

St. Louis

Fly to

Perth

Route

Depart

Return

Price

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 9/9

7:23 am-11:55 am

2 stops39h 32m

Perth

Tue 9/16

10:45 pm-8:32 pm

2 stops34h 47m

$1,477

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 9/9

9:15 am-9:30 pm

3 stops47h 15m

Perth

Tue 9/16

11:55 pm-3:18 pm

3 stops52h 23m

$1,478

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 8/27

7:23 am-11:55 am

2 stops39h 32m

Perth

Wed 9/3

3:30 pm-3:18 pm

3 stops60h 48m

$1,539

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 8/27

6:45 am-7:45 am

2 stops36h 00m

Perth

Tue 9/2

12:10 am-8:32 pm

2 stops33h 22m

$1,816

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Fri 8/15

9:15 am-1:35 pm

3 stops39h 20m

$792

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Fri 8/15

7:23 am-11:55 am

2 stops39h 32m

$855

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/26

Best time to book a flight from St. Louis to Perth

Have a flexible travel schedule? Discover the best time to fly to Perth from St. Louis with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Perth

What is the cheapest time of day to fly from STL to PER?

Find hourly flight availability from St. Louis to Perth. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 28, 2025.

Unlike in the evening, when flights are generally more expensive, you can save up to 47% on flights from St. Louis to Perth by exploring options for tickets at noon.

Reviews of airlines servicing Perth

Get insights into the airlines that provide service to Perth. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Perth. Reviews last updated July 28, 2025.
Peruse reviews from past customers who have flown with Cathay Pacific, Qatar Airways, and Air Canada from St. Louis to Perth to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Cathay Pacific
7.6
Good
944 reviews

Comfort

7.6

Overall

7.6

Food

7.3

Crew

8.1

Boarding

7.9

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Steve,Jun 2025

DFW - HKG

Very rude stewardess lied about the food then argued about it very unprofessional
Cathay Pacific
7.6
Good
944 reviews
Cathay Pacific
7.6
Good
944 reviews

Comfort

7.6

Overall

7.6

Food

7.3

Crew

8.1

Boarding

7.9

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Steve,Jun 2025

DFW - HKG

Very rude stewardess lied about the food then argued about it very unprofessional
Qatar Airways
7.4
Good
3,609 reviews
Cathay Pacific
7.6
Good
944 reviews

Comfort

7.6

Overall

7.6

Food

7.3

Crew

8.1

Boarding

7.9

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Steve,Jun 2025

DFW - HKG

Very rude stewardess lied about the food then argued about it very unprofessional
Air Canada
7.1
Good
9,813 reviews
Cathay Pacific
7.6
Good
944 reviews

Comfort

7.6

Overall

7.6

Food

7.3

Crew

8.1

Boarding

7.9

Entertainment

7.8

Reviews

1 / 20
6.0
Good

Steve,Jun 2025

DFW - HKG

Very rude stewardess lied about the food then argued about it very unprofessional

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Perth. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from St. Louis to Perth round-trip?

    Flying on Qatar Airways is currently your cheapest option to Perth, with prices starting at $1,477. Additional round-trip tickets that might be worth considering are offered by Air Canada and Cathay Pacific, with the lowest prices starting at $1,598 and $1,816, respectively.

  • Can I find deals for flights from St. Louis to Perth that include hotel bookings?

    Yes. In addition to deals on St. Louis to Perth flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Perth?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Perth.

  • Can I find deals for business class flights from St. Louis to Perth?

    Yes. Cheapflights offers flight deals from St. Louis to Perth by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from St. Louis to Perth?

    Currently, February is the cheapest month in which you can book a flight from St. Louis to Perth (average of $1,455). Flying from St. Louis to Perth in December is currently the most expensive (average of $2,172). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Perth?

Book flights to Perth if you plan to visit one of these locations
Fremantle
Rottnest Island
Scarborough

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Perth

See prices for flight routes from nearby airports that may be better suited for you.
Kansas City to Perth flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.