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Cheap flights from St. Louis to Perth from $1,425

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 15/5. 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

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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.
Qatar Airways Logo
06:02 - 18:35
STL
-
PER
47h 33m
2 stops
Qatar Airways Logo
22:45 - 23:59
PER
-
STL
38h 14m
2 stops
$2,097Qatar Airways
Tue, 18 Aug - Mon, 21 Sep
Multiple Airlines Logo
06:02 - 18:35
STL
-
PER
47h 33m
2 stops
Multiple Airlines Logo
22:45 - 23:59
PER
-
STL
38h 14m
2 stops
$2,141Multiple Airlines
Tue, 18 Aug - Sun, 20 Sep
Qatar Airways Logo
06:02 - 18:35
STL
-
PER
47h 33m
2 stops
Qatar Airways Logo
22:45 - 23:59
PER
-
STL
38h 14m
2 stops
$2,155Qatar Airways
Tue, 18 Aug - Sun, 20 Sep
Qatar Airways Logo
06:02 - 18:35
STL
-
PER
47h 33m
2 stops
Qatar Airways Logo
22:45 - 23:59
PER
-
STL
38h 14m
2 stops
$2,225Qatar Airways
Mon, 17 Aug - Mon, 21 Sep
Qatar Airways Logo
06:02 - 18:35
STL
-
PER
47h 33m
2 stops
Qatar Airways Logo
22:45 - 23:59
PER
-
STL
38h 14m
2 stops
$2,280Qatar Airways
Tue, 18 Aug - Sun, 20 Sep
Qatar Airways Logo
16:46 - 12:15
STL
-
PER
54h 29m
2 stops
Qatar Airways Logo
22:55 - 23:54
PER
-
STL
37h 59m
2 stops
$2,313Qatar Airways
Fri, 8 May - Fri, 15 May
Multiple Airlines Logo
19:41 - 12:15
STL
-
PER
51h 34m
2 stops
Multiple Airlines Logo
22:55 - 23:54
PER
-
STL
37h 59m
2 stops
$2,569Multiple Airlines
Tue, 26 May - Tue, 2 Jun
Qatar Airways Logo
12:27 - 12:15
STL
-
PER
34h 48m
2 stops
Qatar Airways Logo
22:55 - 23:54
PER
-
STL
37h 59m
2 stops
$2,627Qatar Airways
Fri, 8 May - Fri, 15 May
Qatar Airways Logo
14:33 - 12:15
STL
-
PER
32h 42m
2 stops
Qatar Airways Logo
22:55 - 23:54
PER
-
STL
37h 59m
2 stops
$2,630Qatar Airways
Fri, 8 May - Fri, 15 May
United Airlines Logo
19:23 - 14:40
STL
-
PER
30h 17m
2 stops
United Airlines Logo
15:30 - 15:46
PER
-
STL
61h 16m
3 stops
$2,695United Airlines
Tue, 26 May - Tue, 2 Jun

Qatar Airways flights from St. Louis to Perth

Our best Qatar Airways deals on St. Louis to Perth flight tickets
Qatar Airways
18 Aug
STL06:02Lambert-St Louis
47h 33m
2 stops
PER18:35Perth
21 Sept
PER22:45Perth
38h 14m
2 stops
STL23:59Lambert-St Louis
$2,097
Qatar Airways
18 Aug
STL06:02Lambert-St Louis
47h 33m
2 stops
PER18:35Perth
20 Sept
PER22:45Perth
38h 14m
2 stops
STL23:59Lambert-St Louis
$2,155
Qatar Airways
17 Aug
STL06:02Lambert-St Louis
47h 33m
2 stops
PER18:35Perth
21 Sept
PER22:45Perth
38h 14m
2 stops
STL23:59Lambert-St Louis
$2,225

United Airlines flights from St. Louis to Perth

Our best United Airlines deals on St. Louis to Perth flight tickets
United Airlines
26 May
STL19:23Lambert-St Louis
30h 17m
2 stops
PER14:40Perth
2 June
PER15:30Perth
61h 16m
3 stops
STL15:46Lambert-St Louis
$2,695
United Airlines
1 May
STL19:06Lambert-St Louis
28h 24m
2 stops
PER12:30Perth
7 May
PER23:45Perth
43h 02m
2 stops
STL05:47Lambert-St Louis
$2,828
United Airlines
8 May
STL19:06Lambert-St Louis
28h 24m
2 stops
PER12:30Perth
15 May
PER23:45Perth
54h 12m
3 stops
STL16:57Lambert-St Louis
$2,832

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 April 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

Tue 18/8

06:02-18:35

2 stops47h 33m

Perth

Mon 21/9

22:45-23:59

2 stops38h 14m

$2,097

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 18/8

06:02-18:35

2 stops47h 33m

Perth

Sun 20/9

22:45-23:59

2 stops38h 14m

$2,141

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 18/8

06:02-18:35

2 stops47h 33m

Perth

Sun 20/9

22:45-23:59

2 stops38h 14m

$2,155

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Mon 17/8

06:02-18:35

2 stops47h 33m

Perth

Mon 21/9

22:45-23:59

2 stops38h 14m

$2,225

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 18/8

06:02-18:35

2 stops47h 33m

Perth

Sun 20/9

22:45-23:59

2 stops38h 14m

$2,280

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Fri 8/5

16:46-12:15

2 stops54h 29m

Perth

Fri 15/5

22:55-23:54

2 stops37h 59m

$2,313

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 26/5

19:41-12:15

2 stops51h 34m

Perth

Tue 2/6

22:55-23:54

2 stops37h 59m

$2,569

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Fri 8/5

12:27-12:15

2 stops34h 48m

Perth

Fri 15/5

22:55-23:54

2 stops37h 59m

$2,627
Fastest return journey

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Fri 8/5

14:33-12:15

2 stops32h 42m

Perth

Fri 15/5

22:55-23:54

2 stops37h 59m

$2,630

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 26/5

19:23-14:40

2 stops30h 17m

Perth

Tue 2/6

15:30-15:46

3 stops61h 16m

$2,695

Flights are sorted by cheapest return flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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See travel insights to Perth from

How to get the cheapest flight ticket from St. Louis to Perth

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Lambert-St Louis to Perth?

Qantas Airways is the most popular carrier operating from Lambert-St Louis to Perth

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

40h 15m

Direct flights

None
The fastest flight from St. Louis to Perth takes 40h 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 40h 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.

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.

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