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.

$1,451 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.

5:29 pm - 6:55 amSTL Lambert-St Louis-PER Perth

47h 26m2 stops Chicago O'Hare Intl Hong Kong Intl

8:30 am - 6:17 pmPER Perth-STL Lambert-St Louis

47h 47m2 stops Hong Kong Intl Chicago O'Hare Intl

$1,451Multiple Airlines

Sun, Nov 1 - Mon, Nov 16

11:01 am - 6:50 amSTL Lambert-St Louis-PER Perth

30h 49m2 stops Chicago O'Hare Intl Hong Kong Intl

12:10 am - 11:59 pmPER Perth-STL Lambert-St Louis

36h 49m2 stops Hong Kong Intl Seattle/Tacoma Intl

$1,471Multiple Airlines

Mon, Sep 28 - Fri, Oct 2

5:00 am - 6:50 amSTL Lambert-St Louis-PER Perth

36h 50m2 stops Chicago O'Hare Intl Hong Kong Intl

12:10 am - 6:38 pmPER Perth-STL Lambert-St Louis

31h 28m2 stops Hong Kong Intl Seattle/Tacoma Intl

$1,496Multiple Airlines

Thu, Sep 24 - Wed, Sep 30

6:04 am - 10:40 pmSTL Lambert-St Louis-PER Perth

51h 36m2 stops Los Angeles Hong Kong Intl

12:10 am - 11:59 pmPER Perth-STL Lambert-St Louis

36h 49m2 stops Hong Kong Intl Seattle/Tacoma Intl

$1,538Multiple Airlines

Thu, Oct 15 - Wed, Oct 21

4:05 pm - 8:30 pmSTL Lambert-St Louis-PER Perth

62h 25m3 stops Toronto Pearson Intl Vancouver Intl Sydney Kingsford Smith

3:15 pm - 3:26 pmPER Perth-STL Lambert-St Louis

62h 11m3 stops Sydney Kingsford Smith Vancouver Intl Toronto Pearson Intl

$1,594Multiple Airlines

Sun, Nov 1 - Mon, Nov 16

6:29 am - 6:50 amSTL Lambert-St Louis-PER Perth

35h 21m2 stops Seattle/Tacoma Intl Hong Kong Intl

12:10 am - 11:59 pmPER Perth-STL Lambert-St Louis

36h 49m3 stops Hong Kong Intl Vancouver Intl Seattle/Tacoma Intl

$1,687Multiple Airlines

Mon, Sep 28 - Fri, Oct 2

7:05 pm - 2:45 pmSTL Lambert-St Louis-PER Perth

29h 40m2 stops San Francisco Melbourne

10:55 pm - 6:05 pmPER Perth-STL Lambert-St Louis

33h 10m3 stops Sydney Kingsford Smith Los Angeles San Francisco

$1,732United Airlines

Sun, Nov 1 - Mon, Nov 16

7:05 pm - 2:45 pmSTL Lambert-St Louis-PER Perth

29h 40m2 stops San Francisco Melbourne

10:55 pm - 6:05 pmPER Perth-STL Lambert-St Louis

33h 10m3 stops Sydney Kingsford Smith Los Angeles San Francisco

$1,733United Airlines

Sun, Nov 1 - Mon, Nov 16

6:08 pm - 10:40 pmSTL Lambert-St Louis-PER Perth

39h 32m3 stops Portland Vancouver Intl Hong Kong Intl

12:10 am - 6:38 pmPER Perth-STL Lambert-St Louis

31h 28m2 stops Hong Kong Intl Seattle/Tacoma Intl

$1,925Multiple Airlines

Thu, Sep 24 - Wed, Sep 30

11:35 am - 6:45 pmSTL Lambert-St Louis-PER Perth

41h 10m2 stops Chicago O'Hare Intl Doha Hamad Intl

10:45 pm - 10:24 pmPER Perth-STL Lambert-St Louis

37h 39m2 stops Doha Hamad Intl Chicago O'Hare Intl

$1,939Qatar Airways

Mon, Nov 9 - Fri, Nov 13

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United Airlines flights from St. Louis to Perth

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

United Airlines

Nov 1

STL7:05 pmLambert-St Louis

29h 40m

2 stops

PER2:45 pmPerth

Nov 16

PER10:55 pmPerth

33h 10m

3 stops

STL6:05 pmLambert-St Louis

$1,732

United Airlines

Nov 1

STL7:05 pmLambert-St Louis

29h 40m

2 stops

PER2:45 pmPerth

Nov 16

PER10:55 pmPerth

33h 10m

3 stops

STL6:05 pmLambert-St Louis

$1,733

United Airlines

Oct 15

STL7:08 amLambert-St Louis

42h 37m

2 stops

PER2:45 pmPerth

Oct 22

PER11:45 pmPerth

31h 58m

2 stops

STL6:43 pmLambert-St Louis

$2,027

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisPerth

STL Lambert-St Louis - PER Perth

STLPER

Lambert-St Louis

Sun 11/1

5:29 pm-6:55 am

2 stops47h 26m

Perth

Mon 11/16

8:30 am-6:17 pm

2 stops47h 47m

$1,451

St. LouisPerth

STL Lambert-St Louis - PER Perth

STLPER

Lambert-St Louis

Mon 9/28

11:01 am-6:50 am

2 stops30h 49m

Perth

Fri 10/2

12:10 am-11:59 pm

2 stops36h 49m

$1,471

St. LouisPerth

STL Lambert-St Louis - PER Perth

STLPER

Lambert-St Louis

Thu 9/24

5:00 am-6:50 am

2 stops36h 50m

Perth

Wed 9/30

12:10 am-6:38 pm

2 stops31h 28m

$1,496

St. LouisPerth

STL Lambert-St Louis - PER Perth

STLPER

Lambert-St Louis

Thu 10/15

6:04 am-10:40 pm

2 stops51h 36m

Perth

Wed 10/21

12:10 am-11:59 pm

2 stops36h 49m

$1,538

St. LouisPerth

STL Lambert-St Louis - PER Perth

STLPER

Lambert-St Louis

Sun 11/1

4:05 pm-8:30 pm

3 stops62h 25m

Perth

Mon 11/16

3:15 pm-3:26 pm

3 stops62h 11m

$1,594

St. LouisPerth

STL Lambert-St Louis - PER Perth

STLPER

Lambert-St Louis

Mon 9/28

6:29 am-6:50 am

2 stops35h 21m

Perth

Fri 10/2

12:10 am-11:59 pm

3 stops36h 49m

$1,687

Quickest round-trip

St. LouisPerth

STL Lambert-St Louis - PER Perth

STLPER

Lambert-St Louis

Sun 11/1

7:05 pm-2:45 pm

2 stops29h 40m

Perth

Mon 11/16

10:55 pm-6:05 pm

3 stops33h 10m

$1,732

St. LouisPerth

STL Lambert-St Louis - PER Perth

STLPER

Lambert-St Louis

Sun 11/1

7:05 pm-2:45 pm

2 stops29h 40m

Perth

Mon 11/16

10:55 pm-6:05 pm

3 stops33h 10m

$1,733

St. LouisPerth

STL Lambert-St Louis - PER Perth

STLPER

Lambert-St Louis

Thu 9/24

6:08 pm-10:40 pm

3 stops39h 32m

Perth

Wed 9/30

12:10 am-6:38 pm

2 stops31h 28m

$1,925

St. LouisPerth

STL Lambert-St Louis - PER Perth

STLPER

Lambert-St Louis

Mon 11/9

11:35 am-6:45 pm

2 stops41h 10m

Perth

Fri 11/13

10:45 pm-10:24 pm

2 stops37h 39m

$1,939

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

Best Price Found	$1,451
Fastest flight time	30h 49m
Direct flights	None

The best flight deal from St. Louis to Perth found on momondo in the last 72 hours is $1,451

The fastest flight from St. Louis to Perth takes 30h 49m

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 30h 49m.
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

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.