Latest deals
When to book
FAQs
Price Alerts

Cheap flights from St. Louis to Perth from $924

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Perth departing on 19/4. 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

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

Find the cheapest flights from St. Louis to Perth

Cheap return flights

Enter your travel dates to find the best prices.
Qantas Airways Logo
15:38 - 08:50
STL
-
PER
28h 12m
2 stops
Qantas Airways Logo
06:15 - 19:30
PER
-
STL
26h 15m
2 stops
$2,128Qantas Airways
Sat, 11 Apr - Sat, 18 Apr
Qantas Airways Logo
06:21 - 11:15
STL
-
PER
39h 54m
2 stops
Qantas Airways Logo
23:45 - 19:30
PER
-
STL
32h 45m
2 stops
$2,161Qantas Airways
Fri, 10 Apr - Fri, 17 Apr
Qantas Airways Logo
06:21 - 17:00
STL
-
PER
45h 39m
2 stops
Qantas Airways Logo
23:45 - 23:59
PER
-
STL
37h 14m
2 stops
$2,199Qantas Airways
Wed, 6 May - Mon, 18 May
Qantas Airways Logo
19:20 - 08:50
STL
-
PER
48h 30m
2 stops
Qantas Airways Logo
10:30 - 23:59
PER
-
STL
26h 29m
2 stops
$2,238Qantas Airways
Fri, 19 Jun - Thu, 2 Jul
Multiple Airlines Logo
16:20 - 18:35
STL
-
PER
61h 15m
2 stops
Multiple Airlines Logo
15:40 - 23:59
PER
-
STL
45h 19m
2 stops
$2,255Multiple Airlines
Thu, 9 Apr - Thu, 16 Apr
Multiple Airlines Logo
14:20 - 15:45
STL
-
PER
36h 25m
3 stops
Multiple Airlines Logo
23:45 - 23:59
PER
-
STL
37h 14m
2 stops
$2,470Multiple Airlines
Wed, 6 May - Mon, 18 May
United Airlines Logo
19:23 - 14:40
STL
-
PER
30h 17m
2 stops
United Airlines Logo
23:45 - 15:46
PER
-
STL
53h 01m
3 stops
$2,635United Airlines
Fri, 19 Jun - Thu, 2 Jul
Multiple Airlines Logo
14:20 - 15:45
STL
-
PER
36h 25m
3 stops
Multiple Airlines Logo
23:55 - 12:06
PER
-
STL
49h 11m
3 stops
$2,644Multiple Airlines
Wed, 6 May - Mon, 18 May
Multiple Airlines Logo
09:23 - 16:00
STL
-
PER
41h 37m
3 stops
Multiple Airlines Logo
23:50 - 08:41
PER
-
STL
45h 51m
3 stops
$2,691Multiple Airlines
Fri, 19 Jun - Thu, 2 Jul
Multiple Airlines Logo
16:05 - 13:35
STL
-
PER
56h 30m
3 stops
Multiple Airlines Logo
00:50 - 15:24
PER
-
STL
51h 34m
3 stops
$2,937Multiple Airlines
Fri, 10 Apr - Thu, 16 Apr

Qantas Airways flights from St. Louis to Perth

Our best Qantas Airways deals on St. Louis to Perth flight tickets
Qantas Airways
11 Apr
STL15:38Lambert-St Louis
28h 12m
2 stops
PER08:50Perth
18 Apr
PER06:15Perth
26h 15m
2 stops
STL19:30Lambert-St Louis
$2,128
Qantas Airways
10 Apr
STL06:21Lambert-St Louis
39h 54m
2 stops
PER11:15Perth
17 Apr
PER23:45Perth
32h 45m
2 stops
STL19:30Lambert-St Louis
$2,161
Qantas Airways
28 Feb
STL06:38Lambert-St Louis
44h 07m
2 stops
PER16:45Perth
4 Mar
PER10:20Perth
27h 39m
2 stops
STL23:59Lambert-St Louis
$2,199

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 27 February 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

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 11/4

15:38-08:50

2 stops28h 12m

Perth

Sat 18/4

06:15-19:30

2 stops26h 15m

$2,128

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Fri 10/4

06:21-11:15

2 stops39h 54m

Perth

Fri 17/4

23:45-19:30

2 stops32h 45m

$2,161

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 6/5

06:21-17:00

2 stops45h 39m

Perth

Mon 18/5

23:45-23:59

2 stops37h 14m

$2,199

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Fri 19/6

19:20-08:50

2 stops48h 30m

Perth

Thu 2/7

10:30-23:59

2 stops26h 29m

$2,238

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 9/4

16:20-18:35

2 stops61h 15m

Perth

Thu 16/4

15:40-23:59

2 stops45h 19m

$2,255

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 6/5

14:20-15:45

3 stops36h 25m

Perth

Mon 18/5

23:45-23:59

2 stops37h 14m

$2,470

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Fri 19/6

19:23-14:40

2 stops30h 17m

Perth

Thu 2/7

23:45-15:46

3 stops53h 01m

$2,635

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 6/5

14:20-15:45

3 stops36h 25m

Perth

Mon 18/5

23:55-12:06

3 stops49h 11m

$2,644

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Fri 19/6

09:23-16:00

3 stops41h 37m

Perth

Thu 2/7

23:50-08:41

3 stops45h 51m

$2,691

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Fri 10/4

16:05-13:35

3 stops56h 30m

Perth

Thu 16/4

00:50-15:24

3 stops51h 34m

$2,937

Flights are sorted by cheapest return flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
1
2

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

28h 12m

Direct flights

None
The fastest flight from St. Louis to Perth takes 28h 12m
There are no direct flights from St. Louis to Perth. There are no popular flight routes from St. Louis to Perth.
Search flight deals

  • 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 28h 12m.

  • 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.

  • 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
Sun 29/3
Sun 5/4
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to Australia