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.

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.

$2,280 Cheap Flights from St. Louis to Perth in 2025/26

1 adult

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Find the cheapest flights from St. Louis to Perth

Round-trip

One-way

Cheap return flights

Enter your travel dates to find the best prices.

10:04 - 06:55STL-PER

30h 51m2 stops

00:25 - 23:48PER-STL

37h 23m2 stops

$2,280Cathay Pacific

Find Deal

Sat, 28 Feb - Tue, 3 Mar

07:04 - 21:00STL-PER

47h 56m2 stops

17:45 - 14:47PER-STL

35h 02m2 stops

$2,614Qantas Airways

Find Deal

Thu, 8 Jan - Thu, 15 Jan

11:46 - 11:15STL-PER

33h 29m2 stops

10:20 - 23:48PER-STL

27h 28m2 stops

$2,676Qantas Airways

Find Deal

Sat, 28 Feb - Wed, 4 Mar

11:46 - 07:45STL-PER

29h 59m2 stops

10:20 - 23:48PER-STL

27h 28m2 stops

$2,678Qantas Airways

Find Deal

Sat, 28 Feb - Wed, 4 Mar

07:04 - 21:00STL-PER

47h 56m2 stops

23:55 - 15:29PER-STL

53h 34m3 stops

$3,125Multiple Airlines

Find Deal

Thu, 8 Jan - Thu, 15 Jan

07:04 - 06:55STL-PER

33h 51m2 stops

00:25 - 23:59PER-STL

61h 34m2 stops

$3,289Cathay Pacific

Find Deal

Thu, 8 Jan - Wed, 14 Jan

16:05 - 14:30STL-PER

56h 25m3 stops

22:55 - 15:29PER-STL

54h 34m3 stops

$3,904Air Canada

Find Deal

Sat, 28 Feb - Wed, 4 Mar

16:05 - 14:30STL-PER

56h 25m3 stops

22:55 - 15:29PER-STL

54h 34m3 stops

$4,561Air Canada

Find Deal

Sat, 28 Feb - Wed, 4 Mar

08:05 - 22:20STL-PER

48h 15m3 stops

23:50 - 21:13PER-STL

35h 23m3 stops

$4,968Multiple Airlines

Find Deal

Thu, 8 Jan - Thu, 15 Jan

16:05 - 22:55STL-PER

40h 50m2 stops

00:25 - 19:27PER-STL

33h 02m3 stops

$19,146Multiple Airlines

Find Deal

Thu, 8 Jan - Wed, 14 Jan

Qantas Airways flights from St. Louis to Perth

Our best Qantas Airways deals on St. Louis to Perth flight tickets

Qantas Airways

8 Jan

STL07:04Lambert-St Louis

47h 56m

2 stops

PER21:00Perth

15 Jan

PER17:45Perth

35h 02m

2 stops

STL14:47Lambert-St Louis

$2,614

Find similar

Qantas Airways

28 Feb

STL11:46Lambert-St Louis

33h 29m

2 stops

PER11:15Perth

4 Mar

PER10:20Perth

27h 28m

2 stops

STL23:48Lambert-St Louis

$2,676

Find similar

Qantas Airways

28 Feb

STL11:46Lambert-St Louis

29h 59m

2 stops

PER07:45Perth

4 Mar

PER10:20Perth

27h 28m

2 stops

STL23:48Lambert-St Louis

$2,678

Find similar

Cathay Pacific flights from St. Louis to Perth

Our best Cathay Pacific deals on St. Louis to Perth flight tickets

Cathay Pacific

28 Feb

STL10:04Lambert-St Louis

30h 51m

2 stops

PER06:55Perth

3 Mar

PER00:25Perth

37h 23m

2 stops

STL23:48Lambert-St Louis

$2,280

Find similar

Cathay Pacific

8 Jan

STL07:04Lambert-St Louis

33h 51m

2 stops

PER06:55Perth

14 Jan

PER00:25Perth

61h 34m

2 stops

STL23:59Lambert-St Louis

$3,289

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 28/2

10:04-06:55

2 stops30h 51m

Perth

Tue 3/3

00:25-23:48

2 stops37h 23m

$2,280

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 8/1

07:04-21:00

2 stops47h 56m

Perth

Thu 15/1

17:45-14:47

2 stops35h 02m

$2,614

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 28/2

11:46-11:15

2 stops33h 29m

Perth

Wed 4/3

10:20-23:48

2 stops27h 28m

$2,676

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 28/2

11:46-07:45

2 stops29h 59m

Perth

Wed 4/3

10:20-23:48

2 stops27h 28m

$2,678

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 8/1

07:04-21:00

2 stops47h 56m

Perth

Thu 15/1

23:55-15:29

3 stops53h 34m

$3,125

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 8/1

07:04-06:55

2 stops33h 51m

Perth

Wed 14/1

00:25-23:59

2 stops61h 34m

$3,289

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 28/2

16:05-14:30

3 stops56h 25m

Perth

Wed 4/3

22:55-15:29

3 stops54h 34m

$3,904

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 28/2

16:05-14:30

3 stops56h 25m

Perth

Wed 4/3

22:55-15:29

3 stops54h 34m

$4,561

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 8/1

08:05-22:20

3 stops48h 15m

Perth

Thu 15/1

23:50-21:13

3 stops35h 23m

$4,968

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 8/1

16:05-22:55

2 stops40h 50m

Perth

Wed 14/1

00:25-19:27

3 stops33h 02m

$19,146

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	32h 24m
Direct flights	None

The fastest flight from St. Louis to Perth takes 32h 24m

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 29h 50m.
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.

Fremantle

Mandurah

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.