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.

$2,201 Cheap Flights from St. Louis to Perth in 2026

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.

18:36 - 06:55

STL

PER

46h 19m2 stops

08:30 - 23:59

PER

STL

53h 29m2 stops

$2,201Cathay Pacific

ma., 23 feb. - ma., 2 mar.

06:00 - 16:50

STL

PER

44h 50m2 stops

18:50 - 09:23

PER

STL

52h 33m2 stops

$2,333Air New Zealand

sø., 22 feb. - sø., 1 mar.

16:28 - 16:50

STL

PER

34h 22m2 stops

18:50 - 20:26

PER

STL

39h 36m3 stops

$2,374Multiple Airlines

ma., 23 feb. - ma., 2 mar.

11:25 - 16:50

STL

PER

39h 25m3 stops

18:50 - 20:26

PER

STL

39h 36m3 stops

$2,382Multiple Airlines

ma., 23 feb. - ma., 2 mar.

06:36 - 15:15

STL

PER

43h 39m2 stops

06:20 - 18:30

PER

STL

25h 10m2 stops

$2,425Qantas Airways

sø., 21 jun. - on., 8 jul.

06:38 - 21:00

STL

PER

48h 22m2 stops

15:55 - 23:59

PER

STL

46h 04m2 stops

$2,436Qantas Airways

sø., 22 feb. - lø., 28 feb.

06:36 - 21:20

STL

PER

49h 44m2 stops

23:45 - 18:30

PER

STL

31h 45m2 stops

$2,467Qantas Airways

on., 24 jun. - ti., 7 jul.

17:18 - 16:55

STL

PER

34h 37m2 stops

06:20 - 18:30

PER

STL

25h 10m2 stops

$2,482Qantas Airways

lø., 20 jun. - ma., 6 jul.

19:20 - 11:15

STL

PER

50h 55m2 stops

23:45 - 18:30

PER

STL

31h 45m2 stops

$2,494Qantas Airways

fr., 19 jun. - ti., 7 jul.

06:36 - 12:15

STL

PER

40h 39m2 stops

23:45 - 23:59

PER

STL

37h 14m2 stops

$2,500Qantas Airways

sø., 21 jun. - fr., 3 jul.

Cathay Pacific flights from St. Louis to Perth

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

Cathay Pacific

23 Feb

STL18:36Lambert-St Louis

46h 19m

2 stops

PER06:55Perth

2 Mar

PER08:30Perth

53h 29m

2 stops

STL23:59Lambert-St Louis

$2,201

Cathay Pacific

5 Mar

STL18:50Lambert-St Louis

38h 05m

2 stops

PER22:55Perth

9 Mar

PER08:30Perth

46h 28m

2 stops

STL17:58Lambert-St Louis

$2,644

Cathay Pacific

5 Mar

STL18:50Lambert-St Louis

38h 05m

2 stops

PER22:55Perth

9 Mar

PER08:30Perth

46h 28m

2 stops

STL17:58Lambert-St Louis

$2,645

Air New Zealand flights from St. Louis to Perth

Our best Air New Zealand deals on St. Louis to Perth flight tickets

Air New Zealand

22 Feb

STL06:00Lambert-St Louis

44h 50m

2 stops

PER16:50Perth

1 Mar

PER18:50Perth

52h 33m

2 stops

STL09:23Lambert-St Louis

$2,333

Air New Zealand

20 June

STL06:15Lambert-St Louis

44h 45m

2 stops

PER16:00Perth

9 July

PER19:50Perth

57h 45m

2 stops

STL16:35Lambert-St Louis

$2,582

Air New Zealand

22 June

STL19:06Lambert-St Louis

37h 49m

2 stops

PER21:55Perth

7 July

PER19:50Perth

39h 16m

2 stops

STL22:06Lambert-St Louis

$2,641

Fly from

Fly to

Route

Depart

Return

Price

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

ma. 23/2

18:36-06:55

2 stops46h 19m

Perth

ma. 2/3

08:30-23:59

2 stops53h 29m

$2,201

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

sø. 22/2

06:00-16:50

2 stops44h 50m

Perth

sø. 1/3

18:50-09:23

2 stops52h 33m

$2,333

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

ma. 23/2

16:28-16:50

2 stops34h 22m

Perth

ma. 2/3

18:50-20:26

3 stops39h 36m

$2,374

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

ma. 23/2

11:25-16:50

3 stops39h 25m

Perth

ma. 2/3

18:50-20:26

3 stops39h 36m

$2,382

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

sø. 21/6

06:36-15:15

2 stops43h 39m

Perth

on. 8/7

06:20-18:30

2 stops25h 10m

$2,425

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

sø. 22/2

06:38-21:00

2 stops48h 22m

Perth

lø. 28/2

15:55-23:59

2 stops46h 04m

$2,436

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

on. 24/6

06:36-21:20

2 stops49h 44m

Perth

ti. 7/7

23:45-18:30

2 stops31h 45m

$2,467

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

lø. 20/6

17:18-16:55

2 stops34h 37m

Perth

ma. 6/7

06:20-18:30

2 stops25h 10m

$2,482

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

fr. 19/6

19:20-11:15

2 stops50h 55m

Perth

ti. 7/7

23:45-18:30

2 stops31h 45m

$2,494

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

sø. 21/6

06:36-12:15

2 stops40h 39m

Perth

fr. 3/7

23:45-23:59

2 stops37h 14m

$2,500

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	33h 51m
Direct flights	None

The fastest flight from St. Louis to Perth takes 33h 51m

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 33h 51m.
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

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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.