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$1,430+ Cheap flights from St. Louis (STL) to Perth (PER)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
STL — PER
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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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 September 11, 2025.

Round-trip from

$1,430
(Trip.com)
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 September 11, 2025.

This Trip.com deal was found by Cheapflights users on 9/10. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/256:39 amSTL - PER
2 stops35h 41mMultiple Airlines
Sat 11/18:40 amPER - STL
2 stops53h 02mMultiple Airlines
Deal found 9/10$1,430
This Cathay Pacific deal was found by Cheapflights users on 9/9. 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 Cathay Pacific is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/138:39 amSTL - PER
2 stops48h 11mCathay Pacific
Sun 11/1612:15 amPER - STL
2 stops36h 43mCathay Pacific
Deal found 9/9$1,581
This BYOjet deal was found by Cheapflights users on 9/10. 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 BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/255:09 pmSTL - PER
2 stops40h 41mCathay Pacific
Fri 10/3112:15 amPER - STL
2 stops30h 56mCathay Pacific
Deal found 9/10$1,647
This oojo deal was found by Cheapflights users on 9/8. 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.
Mon 9/226:00 amSTL - PER
2 stops47h 40mQatar Airways
Thu 9/2510:45 pmPER - STL
2 stops38h 14mQatar Airways
Deal found 9/8$1,659
This oojo deal was found by Cheapflights users on 9/9. 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.
Thu 9/116:00 amSTL - PER
2 stops40h 55mQatar Airways
Sat 9/1310:45 pmPER - STL
2 stops50h 38mQatar Airways
Deal found 9/9$2,023
This oojo deal was found by Cheapflights users on 9/10. 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.
Sat 12/277:00 amSTL - PER
2 stops39h 00mQatar Airways
Fri 1/1610:45 pmPER - STL
2 stops53h 07mQatar Airways
Deal found 9/10$2,228
This BYOjet deal was found by Cheapflights users on 9/10. 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 BYOjet is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/255:35 pmSTL - PER
2 stops37h 45mAir New Zealand
Sat 11/110:55 pmPER - STL
3 stops33h 51mAir New Zealand
Deal found 9/10$2,370
This Air Canada deal was found by Cheapflights users on 9/8. 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.
Thu 11/134:05 pmSTL - PER
3 stops56h 25mAir Canada
Mon 11/1710:55 pmPER - STL
3 stops54h 34mAir Canada
Deal found 9/8$2,414

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 September 11, 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

Sat 10/25

6:39 am-7:20 am

2 stops35h 41m

Perth

Sat 11/1

8:40 am-12:42 am

2 stops53h 02m

$1,430

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 11/13

8:39 am-10:50 pm

2 stops48h 11m

Perth

Sun 11/16

12:15 am-11:42 pm

2 stops37h 27m

$1,581

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 10/25

5:09 pm-10:50 pm

2 stops40h 41m

Perth

Fri 10/31

12:15 am-6:11 pm

2 stops30h 56m

$1,647

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Mon 9/22

6:00 am-6:40 pm

2 stops47h 40m

Perth

Thu 9/25

10:45 pm-11:59 pm

2 stops38h 14m

$1,659

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 10/25

5:35 pm-8:20 pm

2 stops37h 45m

Perth

Sat 11/1

10:55 pm-7:46 pm

3 stops33h 51m

$2,370

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 11/13

4:05 pm-2:30 pm

3 stops56h 25m

Perth

Mon 11/17

10:55 pm-3:29 pm

3 stops54h 34m

$2,414

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

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 September 11, 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.

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.

  • How long is the flight from St. Louis to Perth?

    Departing from St. Louis to Perth will take you 48h 11m. The distance from St. Louis to Perth is about 10878 mi.

  • 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 $1,438). 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

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