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.

$1,457 Cheap Flights from St. Louis to Perth in 2026

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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.

6:00 am - 6:35 pm

STL

PER

47h 35m

2 stops

10:45 pm - 2:21 pm

PER

STL

52h 36m

2 stops

$1,457Multiple Airlines

水, 9月 16 - 月, 9月 21

8:55 am - 1:35 pm

STL

PER

39h 40m

2 stops

11:55 pm - 8:00 pm

PER

STL

33h 05m

2 stops

$1,530Multiple Airlines

金, 9月 18 - 月, 9月 21

8:55 am - 1:35 pm

STL

PER

39h 40m

2 stops

11:55 pm - 4:34 pm

PER

STL

29h 39m

3 stops

$1,532Multiple Airlines

金, 9月 18 - 月, 9月 21

8:55 am - 3:45 pm

STL

PER

41h 50m

3 stops

3:30 pm - 8:00 pm

PER

STL

41h 30m

3 stops

$1,545Air Canada

水, 9月 16 - 月, 9月 21

8:55 am - 5:00 pm

STL

PER

43h 05m

2 stops

11:55 pm - 4:34 pm

PER

STL

29h 39m

3 stops

$1,554Multiple Airlines

水, 9月 16 - 月, 9月 21

6:30 am - 6:10 pm

STL

PER

46h 40m

2 stops

10:30 am - 11:05 pm

PER

STL

25h 35m

2 stops

$1,593Qantas Airways

火, 10月 6 - 月, 10月 12

6:37 am - 7:10 pm

STL

PER

47h 33m

2 stops

11:45 pm - 11:59 pm

PER

STL

37h 14m

2 stops

$1,801Qantas Airways

日, 7月 12 - 日, 7月 19

6:51 pm - 12:35 pm

STL

PER

28h 44m

2 stops

10:30 am - 12:17 am

PER

STL

26h 47m

3 stops

$1,887Qantas Airways

火, 10月 6 - 月, 10月 12

7:22 pm - 10:50 pm

STL

PER

38h 28m

2 stops

6:00 am - 6:30 pm

PER

STL

49h 30m

3 stops

$2,017Multiple Airlines

日, 7月 12 - 日, 7月 19

6:00 am - 6:35 pm

STL

PER

47h 35m

2 stops

10:45 pm - 8:44 pm

PER

STL

34h 59m

2 stops

$2,046Qatar Airways

土, 9月 19 - 火, 9月 22

Qatar Airways flights from St. Louis to Perth

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

Qatar Airways

Sep 19

STL6:00 amLambert-St Louis

47h 35m

2 stops

PER6:35 pmPerth

Sep 22

PER10:45 pmPerth

34h 59m

2 stops

STL8:44 pmLambert-St Louis

$2,046

Qatar Airways

Sep 18

STL7:21 amLambert-St Louis

46h 14m

2 stops

PER6:35 pmPerth

Sep 21

PER10:45 pmPerth

34h 59m

2 stops

STL8:44 pmLambert-St Louis

$2,382

United Airlines flights from St. Louis to Perth

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

United Airlines

Sep 19

STL4:40 pmLambert-St Louis

30h 50m

3 stops

PER12:30 pmPerth

Sep 22

PER10:40 pmPerth

32h 59m

2 stops

STL6:39 pmLambert-St Louis

$2,659

United Airlines

Sep 19

STL4:40 pmLambert-St Louis

30h 50m

3 stops

PER12:30 pmPerth

Sep 22

PER10:40 pmPerth

32h 59m

2 stops

STL6:39 pmLambert-St Louis

$2,660

United Airlines

Sep 18

STL4:40 pmLambert-St Louis

30h 00m

3 stops

PER11:40 amPerth

Sep 21

PER11:45 pmPerth

52h 53m

3 stops

STL3:38 pmLambert-St Louis

$2,674

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

水 9/16

6:00 am-6:35 pm

2 stops47h 35m

Perth

月 9/21

10:45 pm-2:21 pm

2 stops52h 36m

$1,457

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

金 9/18

8:55 am-1:35 pm

2 stops39h 40m

Perth

月 9/21

11:55 pm-8:00 pm

2 stops33h 05m

$1,530

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

金 9/18

8:55 am-1:35 pm

2 stops39h 40m

Perth

月 9/21

11:55 pm-4:34 pm

3 stops29h 39m

$1,532

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

水 9/16

8:55 am-3:45 pm

3 stops41h 50m

Perth

月 9/21

3:30 pm-8:00 pm

3 stops41h 30m

$1,545

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

水 9/16

8:55 am-5:00 pm

2 stops43h 05m

Perth

月 9/21

11:55 pm-4:34 pm

3 stops29h 39m

$1,554

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

火 10/6

6:30 am-6:10 pm

2 stops46h 40m

Perth

月 10/12

10:30 am-11:05 pm

2 stops25h 35m

$1,593

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

日 7/12

6:37 am-7:10 pm

2 stops47h 33m

Perth

日 7/19

11:45 pm-11:59 pm

2 stops37h 14m

$1,801

Quickest round-trip

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

火 10/6

6:51 pm-12:35 pm

2 stops28h 44m

Perth

月 10/12

10:30 am-12:17 am

3 stops26h 47m

$1,887

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

日 7/12

7:22 pm-10:50 pm

2 stops38h 28m

Perth

日 7/19

6:00 am-6:30 pm

3 stops49h 30m

$2,017

St. LouisPerth

STL - PER

STLPER

Lambert-St Louis

土 9/19

6:00 am-6:35 pm

2 stops47h 35m

Perth

火 9/22

10:45 pm-8:44 pm

2 stops34h 59m

$2,046

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	46h 45m
Direct flights	None

The fastest flight from St. Louis to Perth takes 46h 45m

There are no direct flights from St. Louis to Perth. There are no popular flight routes from St. Louis to Perth.

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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 46h 45m.
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.

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Fremantle

Rottnest Island

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.