Latest deals
When to book
FAQs
Price Alerts

Cheap flights from St. Louis to Perth from $2,328

This is the cheapest return flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Perth departing on 8/8. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from St. Louis to Perth

Cheap return flights

Enter your travel dates to find the best prices.
American Airlines Logo
17:11 - 11:15
STL
-
PER
29h 04m
2 stops
American Airlines Logo
23:55 - 18:05
PER
-
STL
31h 10m
2 stops
$2,328American Airlines
Sat, 8 Aug - Fri, 14 Aug
Qantas Airways Logo
06:00 - 15:15
STL
-
PER
44h 15m
2 stops
Qantas Airways Logo
23:45 - 22:59
PER
-
STL
36h 14m
2 stops
$2,369Qantas Airways
Thu, 27 Aug - Thu, 3 Sep
United Airlines Logo
08:42 - 14:40
STL
-
PER
40h 58m
2 stops
United Airlines Logo
15:30 - 17:59
PER
-
STL
39h 29m
2 stops
$2,377United Airlines
Wed, 26 Aug - Wed, 2 Sep
United Airlines Logo
08:42 - 14:40
STL
-
PER
40h 58m
2 stops
United Airlines Logo
15:30 - 15:38
PER
-
STL
61h 08m
3 stops
$2,403United Airlines
Wed, 26 Aug - Wed, 2 Sep
American Airlines Logo
06:00 - 13:35
STL
-
PER
42h 35m
2 stops
American Airlines Logo
23:55 - 18:05
PER
-
STL
31h 10m
2 stops
$2,418American Airlines
Thu, 27 Aug - Thu, 3 Sep
United Airlines Logo
18:59 - 11:40
STL
-
PER
51h 41m
3 stops
United Airlines Logo
22:40 - 18:39
PER
-
STL
32h 59m
2 stops
$2,451United Airlines
Thu, 27 Aug - Thu, 3 Sep
United Airlines Logo
18:59 - 11:40
STL
-
PER
51h 41m
3 stops
United Airlines Logo
22:40 - 15:31
PER
-
STL
53h 51m
3 stops
$2,477United Airlines
Thu, 27 Aug - Thu, 3 Sep
Multiple Airlines Logo
06:00 - 06:50
STL
-
PER
35h 50m
2 stops
Multiple Airlines Logo
00:10 - 23:42
PER
-
STL
36h 32m
2 stops
$2,484Multiple Airlines
Tue, 25 Aug - Mon, 31 Aug
Multiple Airlines Logo
17:11 - 11:15
STL
-
PER
29h 04m
2 stops
Multiple Airlines Logo
23:45 - 17:37
PER
-
STL
30h 52m
3 stops
$2,657Multiple Airlines
Sat, 8 Aug - Fri, 14 Aug
Qatar Airways Logo
06:29 - 18:35
STL
-
PER
47h 06m
2 stops
Qatar Airways Logo
22:45 - 19:07
PER
-
STL
33h 22m
2 stops
$2,777Qatar Airways
Thu, 10 Sep - Mon, 14 Sep

Save money when you book flights with momondo

Big names, great deals

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customise your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

American Airlines flights from St. Louis to Perth

Our best American Airlines deals on St. Louis to Perth flight tickets
American Airlines
8 Aug
STL17:11Lambert-St Louis
29h 04m
2 stops
PER11:15Perth
14 Aug
PER23:55Perth
31h 10m
2 stops
STL18:05Lambert-St Louis
$2,328
American Airlines
27 Aug
STL06:00Lambert-St Louis
42h 35m
2 stops
PER13:35Perth
3 Sept
PER23:55Perth
31h 10m
2 stops
STL18:05Lambert-St Louis
$2,418

Qantas Airways flights from St. Louis to Perth

Our best Qantas Airways deals on St. Louis to Perth flight tickets
Qantas Airways
27 Aug
STL06:00Lambert-St Louis
44h 15m
2 stops
PER15:15Perth
3 Sept
PER23:45Perth
36h 14m
2 stops
STL22:59Lambert-St Louis
$2,369
Qantas Airways
27 Dec
STL18:44Lambert-St Louis
26h 31m
2 stops
PER11:15Perth
17 Jan
PER22:55Perth
31h 19m
2 stops
STL16:14Lambert-St Louis
$2,960

momondo Fare Finder

 
Customise 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, momondo users made 78,305 searches. Data last updated 14 July 2026.
Use the filters below to find and compare flights from St. Louis to Perth that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 8/8

17:11-11:15

2 stops29h 04m

Perth

Fri 14/8

23:55-18:05

2 stops31h 10m

$2,328

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 27/8

06:00-15:15

2 stops44h 15m

Perth

Thu 3/9

23:45-22:59

2 stops36h 14m

$2,369

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 26/8

08:42-14:40

2 stops40h 58m

Perth

Wed 2/9

15:30-17:59

2 stops39h 29m

$2,377

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 26/8

08:42-14:40

2 stops40h 58m

Perth

Wed 2/9

15:30-15:38

3 stops61h 08m

$2,403

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 27/8

06:00-13:35

2 stops42h 35m

Perth

Thu 3/9

23:55-18:05

2 stops31h 10m

$2,418

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 27/8

18:59-11:40

3 stops51h 41m

Perth

Thu 3/9

22:40-18:39

2 stops32h 59m

$2,451

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 27/8

18:59-11:40

3 stops51h 41m

Perth

Thu 3/9

22:40-15:31

3 stops53h 51m

$2,477

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 25/8

06:00-06:50

2 stops35h 50m

Perth

Mon 31/8

00:10-23:42

2 stops36h 32m

$2,484
Fastest return journey

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 8/8

17:11-11:15

2 stops29h 04m

Perth

Fri 14/8

23:45-17:37

3 stops30h 52m

$2,657

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 10/9

06:29-18:35

2 stops47h 06m

Perth

Mon 14/9

22:45-19:07

2 stops33h 22m

$2,777

Flights are sorted by cheapest return flights first.

Sorted by cheapest first

When to book flights from St. Louis to Perth

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Perth according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap St. Louis to Perth (STL to PER) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Perth

Fastest flight time

44h 15m

Direct flights

None
The fastest flight from St. Louis to Perth takes 44h 15m
There are no direct flights from St. Louis to Perth. There are no popular flight routes from St. Louis to Perth.
Search flight deals

Frequently asked questions about flying from St. Louis to Perth

  • How far is Lambert-St Louis to Perth by plane?

    There are 17533.8 km between Lambert-St Louis and Perth. In terms of flight time, this usually takes a little over 44h 15m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Perth Airport?

    Prices for flights from Lambert-St Louis Airport to Perth Airport refresh daily.

  • How old do you have to be to fly from Lambert-St Louis Airport to Perth Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and stopovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Perth Airport.

  • What documentation or ID do you need to fly to Perth Airport?

    The travel and health documents required for your trip to Perth Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s licence, and a passport valid for six-months after you plan to arrive at Perth Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Frequently asked questions about flying from St. Louis to Perth

  • How do I get Price Alerts for flights from St. Louis to Perth?

    Search flight deals from St. Louis to Perth. While viewing offers you’ll have the option to create a Price Alert.

  • How can I save money on flights from St. Louis to Perth with momondo?

    With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

  • How does momondo find its flight prices?

    We compare prices from 700+ competitors to help you find the price that works best for you. momondo operates in over 30 international markets, bringing you access to a wide range of fares and deals. Search for your travel using momondo for a diverse range of options from airlines and OTAs.

Travelling to a place near Perth?

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

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Perth?

It is quick and easy to find St. Louis to Perth flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to Perth that suits you.

Can I find flights from St. Louis to Perth with flexible booking policies on momondo?

All flight searches from St. Louis to Perth on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from St. Louis to Perth?

momondo helps you find the best flight between St. Louis and Perth by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from St. Louis to Perth right now. Can momondo alert me if prices change?

Price alerts on flights to Perth from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your Perth trip

We make it super easy to schedule, organise and travel with friends or family. Trips is free – and available to use no matter where you book.
Start using Trips
Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Thu 13/8
Thu 20/8
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Australia