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Cheap flights from St. Louis to Perth from $2,027

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 16/9. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from St. Louis to Perth

Cheap return flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
06:00 - 18:35
STL
-
PER
47h 35m
2 stops
Multiple Airlines Logo
22:45 - 14:21
PER
-
STL
52h 36m
2 stops
$2,027Multiple Airlines
Wed, 16 Sep - Mon, 21 Sep
Multiple Airlines Logo
08:55 - 13:35
STL
-
PER
39h 40m
2 stops
Multiple Airlines Logo
23:55 - 20:00
PER
-
STL
33h 05m
2 stops
$2,129Multiple Airlines
Fri, 18 Sep - Mon, 21 Sep
Multiple Airlines Logo
08:55 - 13:35
STL
-
PER
39h 40m
2 stops
Multiple Airlines Logo
23:55 - 16:34
PER
-
STL
29h 39m
3 stops
$2,131Multiple Airlines
Fri, 18 Sep - Mon, 21 Sep
Air Canada Logo
08:55 - 15:45
STL
-
PER
41h 50m
3 stops
Air Canada Logo
15:30 - 20:00
PER
-
STL
41h 30m
3 stops
$2,149Air Canada
Wed, 16 Sep - Mon, 21 Sep
Multiple Airlines Logo
08:55 - 17:00
STL
-
PER
43h 05m
2 stops
Multiple Airlines Logo
23:55 - 16:34
PER
-
STL
29h 39m
3 stops
$2,162Multiple Airlines
Wed, 16 Sep - Mon, 21 Sep
Qantas Airways Logo
06:30 - 18:10
STL
-
PER
46h 40m
2 stops
Qantas Airways Logo
10:30 - 23:05
PER
-
STL
25h 35m
2 stops
$2,216Qantas Airways
Tue, 6 Oct - Mon, 12 Oct
Qantas Airways Logo
06:37 - 19:10
STL
-
PER
47h 33m
2 stops
Qantas Airways Logo
23:45 - 23:59
PER
-
STL
37h 14m
2 stops
$2,506Qantas Airways
Sun, 12 Jul - Sun, 19 Jul
Qantas Airways Logo
18:51 - 12:35
STL
-
PER
28h 44m
2 stops
Qantas Airways Logo
10:30 - 00:17
PER
-
STL
26h 47m
3 stops
$2,625Qantas Airways
Tue, 6 Oct - Mon, 12 Oct
Multiple Airlines Logo
19:22 - 22:50
STL
-
PER
38h 28m
2 stops
Multiple Airlines Logo
06:00 - 18:30
PER
-
STL
49h 30m
3 stops
$2,806Multiple Airlines
Sun, 12 Jul - Sun, 19 Jul
Qatar Airways Logo
06:00 - 18:35
STL
-
PER
47h 35m
2 stops
Qatar Airways Logo
22:45 - 20:44
PER
-
STL
34h 59m
2 stops
$2,847Qatar Airways
Sat, 19 Sep - Tue, 22 Sep

Air Canada flights from St. Louis to Perth

Our best Air Canada deals on St. Louis to Perth flight tickets
Air Canada
6 Oct
STL14:40Lambert-St Louis
41h 00m
3 stops
PER20:40Perth
12 Oct
PER22:55Perth
34h 05m
3 stops
STL20:00Lambert-St Louis
$2,149
Air Canada
19 Sept
STL08:55Lambert-St Louis
43h 05m
3 stops
PER17:00Perth
22 Sept
PER23:55Perth
33h 05m
3 stops
STL20:00Lambert-St Louis
$3,964
Air Canada
19 Sept
STL14:40Lambert-St Louis
36h 05m
3 stops
PER15:45Perth
22 Sept
PER23:55Perth
33h 05m
3 stops
STL20:00Lambert-St Louis
$4,291

Qantas Airways flights from St. Louis to Perth

Our best Qantas Airways deals on St. Louis to Perth flight tickets
Qantas Airways
6 Oct
STL18:51Lambert-St Louis
62h 19m
2 stops
PER22:10Perth
12 Oct
PER10:30Perth
25h 35m
2 stops
STL23:05Lambert-St Louis
$2,200
Qantas Airways
6 Oct
STL06:30Lambert-St Louis
46h 40m
2 stops
PER18:10Perth
12 Oct
PER10:30Perth
25h 35m
2 stops
STL23:05Lambert-St Louis
$2,216
Qantas Airways
12 July
STL06:37Lambert-St Louis
47h 33m
2 stops
PER19:10Perth
19 July
PER23:45Perth
37h 14m
2 stops
STL23:59Lambert-St Louis
$2,506

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 31 May 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

Wed 16/9

06:00-18:35

2 stops47h 35m

Perth

Mon 21/9

22:45-14:21

2 stops52h 36m

$2,027

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Fri 18/9

08:55-13:35

2 stops39h 40m

Perth

Mon 21/9

23:55-20:00

2 stops33h 05m

$2,129

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Fri 18/9

08:55-13:35

2 stops39h 40m

Perth

Mon 21/9

23:55-16:34

3 stops29h 39m

$2,131

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 16/9

08:55-15:45

3 stops41h 50m

Perth

Mon 21/9

15:30-20:00

3 stops41h 30m

$2,149

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 16/9

08:55-17:00

2 stops43h 05m

Perth

Mon 21/9

23:55-16:34

3 stops29h 39m

$2,162

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 6/10

06:30-18:10

2 stops46h 40m

Perth

Mon 12/10

10:30-23:05

2 stops25h 35m

$2,216

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sun 12/7

06:37-19:10

2 stops47h 33m

Perth

Sun 19/7

23:45-23:59

2 stops37h 14m

$2,506
Fastest return journey

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 6/10

18:51-12:35

2 stops28h 44m

Perth

Mon 12/10

10:30-00:17

3 stops26h 47m

$2,625

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sun 12/7

19:22-22:50

2 stops38h 28m

Perth

Sun 19/7

06:00-18:30

3 stops49h 30m

$2,806

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 19/9

06:00-18:35

2 stops47h 35m

Perth

Tue 22/9

22:45-20:44

2 stops34h 59m

$2,846

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

47h 33m

Direct flights

None
The fastest flight from St. Louis to Perth takes 47h 33m
There are no direct flights from St. Louis to Perth. There are no popular flight routes from St. Louis to Perth.
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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 47h 33m.

  • 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

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