How do I get Price Alerts for flights from St. Louis to Perth?

You can take advantage of momondo’s Price Alerts by first searching for your flights to St. Louis from Perth . Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

How can I save money on flights from St. Louis to Perth with momondo?

Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

How does momondo find its flight prices?

We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

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 are refreshed on a daily basis.

How old do you have to be to fly from Lambert-St Louis Airport to Perth Airport?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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 you'll need for your trip to Perth Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Perth Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$1,614 Cheap Flights from St. Louis to Perth in 2026

Find the cheapest flights from St. Louis to Perth

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

5:11 pm - 11:15 am

STL

PER

29h 04m

2 stops

11:55 pm - 6:05 pm

PER

STL

31h 10m

2 stops

$1,614American Airlines

Sat, Aug 8 - Fri, Aug 14

6:00 am - 3:15 pm

STL

PER

44h 15m

2 stops

11:45 pm - 10:59 pm

PER

STL

36h 14m

2 stops

$1,642Qantas Airways

Thu, Aug 27 - Thu, Sep 3

8:42 am - 2:40 pm

STL

PER

40h 58m

2 stops

3:30 pm - 5:59 pm

PER

STL

39h 29m

2 stops

$1,648United Airlines

Wed, Aug 26 - Wed, Sep 2

8:42 am - 2:40 pm

STL

PER

40h 58m

2 stops

3:30 pm - 3:38 pm

PER

STL

61h 08m

3 stops

$1,666United Airlines

Wed, Aug 26 - Wed, Sep 2

6:59 pm - 11:40 am

STL

PER

51h 41m

3 stops

10:40 pm - 6:39 pm

PER

STL

32h 59m

2 stops

$1,699United Airlines

Thu, Aug 27 - Thu, Sep 3

6:59 pm - 11:40 am

STL

PER

51h 41m

3 stops

10:40 pm - 3:31 pm

PER

STL

53h 51m

3 stops

$1,717United Airlines

Thu, Aug 27 - Thu, Sep 3

6:00 am - 6:50 am

STL

PER

35h 50m

2 stops

12:10 am - 11:42 pm

PER

STL

36h 32m

2 stops

$1,722Multiple Airlines

Tue, Aug 25 - Mon, Aug 31

5:11 pm - 11:15 am

STL

PER

29h 04m

2 stops

11:45 pm - 5:37 pm

PER

STL

30h 52m

3 stops

$1,842Multiple Airlines

Sat, Aug 8 - Fri, Aug 14

6:29 am - 6:35 pm

STL

PER

47h 06m

2 stops

10:45 pm - 7:07 pm

PER

STL

33h 22m

2 stops

$1,925Qatar Airways

Thu, Sep 10 - Mon, Sep 14

6:00 am - 6:35 pm

STL

PER

47h 35m

2 stops

10:45 pm - 7:07 pm

PER

STL

33h 22m

2 stops

$1,946Qatar Airways

Thu, Sep 10 - Mon, Sep 14

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Qatar Airways flights from St. Louis to Perth

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

Qatar Airways

Sep 10

STL6:29 amLambert-St Louis

47h 06m

2 stops

PER6:35 pmPerth

Sep 14

PER10:45 pmPerth

33h 22m

2 stops

STL7:07 pmLambert-St Louis

$1,925

Qatar Airways

Sep 10

STL6:00 amLambert-St Louis

47h 35m

2 stops

PER6:35 pmPerth

Sep 14

PER10:45 pmPerth

33h 22m

2 stops

STL7:07 pmLambert-St Louis

$1,946

United Airlines flights from St. Louis to Perth

Our best United Airlines deals on St. Louis to Perth flight tickets

United Airlines

Aug 26

STL8:42 amLambert-St Louis

40h 58m

2 stops

PER2:40 pmPerth

Sep 2

PER3:30 pmPerth

39h 29m

2 stops

STL5:59 pmLambert-St Louis

$1,648

United Airlines

Aug 26

STL8:42 amLambert-St Louis

40h 58m

2 stops

PER2:40 pmPerth

Sep 2

PER3:30 pmPerth

61h 08m

3 stops

STL3:38 pmLambert-St Louis

$1,666

United Airlines

Aug 27

STL6:59 pmLambert-St Louis

51h 41m

3 stops

PER11:40 amPerth

Sep 3

PER10:40 pmPerth

32h 59m

2 stops

STL6:39 pmLambert-St Louis

$1,699

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 8/8

5:11 pm-11:15 am

2 stops29h 04m

Perth

Fri 8/14

11:55 pm-6:05 pm

2 stops31h 10m

$1,614

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 8/27

6:00 am-3:15 pm

2 stops44h 15m

Perth

Thu 9/3

11:45 pm-10:59 pm

2 stops36h 14m

$1,642

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 8/26

8:42 am-2:40 pm

2 stops40h 58m

Perth

Wed 9/2

3:30 pm-5:59 pm

2 stops39h 29m

$1,648

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Wed 8/26

8:42 am-2:40 pm

2 stops40h 58m

Perth

Wed 9/2

3:30 pm-3:38 pm

3 stops61h 08m

$1,666

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 8/27

6:59 pm-11:40 am

3 stops51h 41m

Perth

Thu 9/3

10:40 pm-6:39 pm

2 stops32h 59m

$1,699

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 8/27

6:59 pm-11:40 am

3 stops51h 41m

Perth

Thu 9/3

10:40 pm-3:31 pm

3 stops53h 51m

$1,717

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Tue 8/25

6:00 am-6:50 am

2 stops35h 50m

Perth

Mon 8/31

12:10 am-11:42 pm

2 stops36h 32m

$1,722

Quickest round-trip

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Sat 8/8

5:11 pm-11:15 am

2 stops29h 04m

Perth

Fri 8/14

11:45 pm-5:37 pm

3 stops30h 52m

$1,842

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 9/10

6:29 am-6:35 pm

2 stops47h 06m

Perth

Mon 9/14

10:45 pm-7:07 pm

2 stops33h 22m

$1,925

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

Thu 9/10

6:00 am-6:35 pm

2 stops47h 35m

Perth

Mon 9/14

10:45 pm-7:07 pm

2 stops33h 22m

$1,946

Flights are sorted by cheapest round-trip 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 round-trip 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 58m
Direct flights	None

The fastest flight from St. Louis to Perth takes 40h 58m

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?
Lambert-St Louis and Perth are 10895.1 mi apart from one another. By plane, this route typically takes 40h 58m.
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 are refreshed on a daily basis.
How old do you have to be to fly from Lambert-St Louis Airport to Perth Airport?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check 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 you'll need for your trip to Perth Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Perth Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Frequently asked questions about flying from St. Louis to Perth

How do I get Price Alerts for flights from St. Louis to Perth?
You can take advantage of momondo’s Price Alerts by first searching for your flights to St. Louis from Perth. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.
How can I save money on flights from St. Louis to Perth with momondo?
Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.
How does momondo find its flight prices?
We aggregate our prices from over 700+ competitors from airlines to OTAs. We operate in over 30 markets worldwide to show you a wide range of travel options.

Rottnest Island

Fremantle

Mandurah

Scarborough

Waikiki

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Perth?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Perth from St. Louis.

Can I find flights from St. Louis to Perth with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Perth from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Perth?

Once you have performed a search for St. Louis to Perth flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from St. Louis to Perth right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of St. Louis to Perth flights. All you need is a valid email address and we will do the rest; it is that quick and easy.