How many flights depart from Phoenix to St. Louis on average per day?

6 flights are operational daily from Phoenix to St. Louis as of July 2025. The most popular departure time for this route is 12:00PM, with 46% of flights per day taking off in the afternoon.

What airlines fly to St. Louis?

American Airlines, Southwest and Frontier are the top three most popular airlines that fly to St. Louis from Phoenix according to our data. American Airlines is the first choice among our users, with 45% of people opting to fly with this airline when traveling to St. Louis. Keep in mind that there are 5 different airlines that fly to St. Louis on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Phoenix to Lambert-St Louis?

Spirit Airlines, Southwest, and Frontier are the most popular carriers operating from Phoenix to Lambert-St Louis

How many flights depart from Phoenix to St. Louis on average per week?

As of July 2025, 45 flights take off from Phoenix and land in St. Louis each week. The most common flight departure day for this route is Tue, with 18% of weekly flights taking off on this day.

When did momondo last update prices for flights from Phoenix to Lambert-St Louis Airport?

Prices for flights from Phoenix to Lambert-St Louis Airport are refreshed on a daily basis.

How many operators does momondo search for flights from Phoenix to Lambert-St Louis Airport?

As of July 2025, there are 5 operators available to choose from for flights from Phoenix to Lambert-St Louis Airport.

How old do you have to be to fly from Phoenix to Lambert-St Louis 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 layovers. It is recommended that you verify with the airline you are booking with for travel from Phoenix to Lambert-St Louis Airport.

What documentation or ID do you need to fly to Lambert-St Louis Airport?

The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$79 Cheap Flights from Phoenix to St. Louis in 2025

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Find the cheapest flights from Phoenix to St. Louis

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

10:42 pm - 1:32 pmPHX-STL

12h 50m1 stop

2:30 pm - 9:37 pmSTL-PHX

9h 07m1 stop

$124Spirit Airlines

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Thu, Aug 21 - Sun, Aug 31

10:42 pm - 1:32 pmPHX-STL

12h 50m1 stop

2:30 pm - 9:37 pmSTL-PHX

9h 07m1 stop

$140Spirit Airlines

Find Deal

Sun, Aug 17 - Fri, Aug 22

11:49 pm - 9:52 amPHX-STL

8h 03m1 stop

10:47 am - 10:34 pmSTL-PHX

13h 47m1 stop

$163Spirit Airlines

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Thu, Aug 7 - Mon, Aug 11

5:40 pm - 10:35 pmPHX-STL

2h 55mnonstop

8:35 am - 9:50 amSTL-PHX

3h 15mnonstop

$164Southwest

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Wed, Aug 20 - Sat, Aug 23

6:30 pm - 11:25 pmPHX-STL

2h 55mnonstop

9:40 pm - 10:55 pmSTL-PHX

3h 15mnonstop

$174Southwest

Find Deal

Thu, Sep 18 - Thu, Sep 25

1:45 pm - 9:18 amPHX-STL

17h 33m1 stop

10:17 am - 6:54 pmSTL-PHX

10h 37m1 stop

$186Frontier

Find Deal

Sat, Aug 23 - Sun, Aug 31

7:23 pm - 12:28 amPHX-STL

3h 05mnonstop

7:53 am - 9:08 amSTL-PHX

3h 15mnonstop

$190American Airlines

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Mon, Aug 4 - Sun, Aug 10

6:40 am - 6:23 pmPHX-STL

9h 43m1 stop

8:50 am - 4:09 pmSTL-PHX

9h 19m1 stop

$195American Airlines

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Wed, Aug 6 - Sat, Aug 9

6:02 pm - 11:27 amPHX-STL

15h 25m1 stop

7:34 am - 8:52 amSTL-PHX

27h 18m1 stop

$201Sun Country Air

Find Deal

Thu, Sep 18 - Sun, Sep 21

8:21 pm - 9:11 amPHX-STL

10h 50m1 stop

7:54 pm - 11:24 pmSTL-PHX

5h 30m1 stop

$211Frontier

Find Deal

Mon, Aug 18 - Fri, Aug 29

American Airlines flights from Phoenix to St. Louis

Our best American Airlines deals on Phoenix to St. Louis flight tickets

American Airlines

Aug 4

PHX7:23 pmPhoenix Sky Harbor Intl

3h 05m

STL12:28 amLambert-St Louis

Aug 10

STL7:53 amLambert-St Louis

3h 15m

PHX9:08 amPhoenix Sky Harbor Intl

$190

Find similar

American Airlines

Aug 6

PHX6:40 amPhoenix Sky Harbor Intl

9h 43m

1 stop

STL6:23 pmLambert-St Louis

Aug 9

STL8:50 amLambert-St Louis

9h 19m

1 stop

PHX4:09 pmPhoenix Sky Harbor Intl

$195

Find similar

American Airlines

Aug 7

PHX7:11 pmPhoenix Sky Harbor Intl

3h 05m

STL12:16 amLambert-St Louis

Aug 11

STL7:01 amLambert-St Louis

9h 45m

1 stop

PHX2:46 pmPhoenix Sky Harbor Intl

$204

Find similar

Southwest flights from Phoenix to St. Louis

Our best Southwest deals on Phoenix to St. Louis flight tickets

Southwest

Aug 20

PHX5:40 pmPhoenix Sky Harbor Intl

2h 55m

STL10:35 pmLambert-St Louis

Aug 23

STL8:35 amLambert-St Louis

3h 15m

PHX9:50 amPhoenix Sky Harbor Intl

$164

Find similar

Southwest

Sep 18

PHX6:30 pmPhoenix Sky Harbor Intl

2h 55m

STL11:25 pmLambert-St Louis

Sep 25

STL9:40 pmLambert-St Louis

3h 15m

PHX10:55 pmPhoenix Sky Harbor Intl

$174

Find similar

Southwest

Aug 20

PHX5:40 pmPhoenix Sky Harbor Intl

2h 55m

STL10:35 pmLambert-St Louis

Aug 23

STL1:45 pmLambert-St Louis

6h 55m

2 stops

PHX6:40 pmPhoenix Sky Harbor Intl

$179

Find similar

How to get the cheapest flight ticket from Phoenix to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to St. Louis?

In general, August is the cheapest month to fly from Phoenix to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $279. The month of September is another great option to travel to St. Louis, with average flight prices from Phoenix averaging around $292.

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Tuesday when prices can be found for as low as $382. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $449. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Phoenix in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $370 when looking at flights departing in the afternoon. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $463 per ticket.

What is the cheapest Phoenix to Lambert-St Louis flight route?

Fly from Phoenix Sky Harbor Intl to Lambert-St Louis for the best Phoenix - Lambert-St Louis flight prices

How far in advance should I book a flight to St. Louis?

You are more likely to see cheaper flights to St. Louis from Phoenix when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $378 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to St. Louis from Phoenix for as low as $309 on momondo.

What cabin class options are available on Phoenix to Lambert-St Louis flights?

There are 3 cabin classes available to choose from on Phoenix to Lambert-St Louis flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Cheap Phoenix to St. Louis flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Phoenix to St. Louis

Best Price Found	$79
Fastest flight time	2h 50m
Direct flights	Every day
Airports in St. Louis	1 airport

The best one-way flight to St. Louis from Phoenix in the past 72 hours is $79. The best round-trip flight deal from Phoenix to St. Louis found on momondo in the last 72 hours is $124.

The fastest flight from Phoenix to St. Louis takes 2h 50m

Direct flights go from Phoenix to St. Louis every day.

There is 1 airport near St. Louis: Lambert-St Louis (STL)

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How far is Phoenix to Lambert-St Louis by plane?
The distance between Phoenix and Lambert-St Louis is about 1269.1 mi. Flights usually cover this in 2h 55m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Phoenix to Lambert-St Louis Airport?
Prices for flights from Phoenix to Lambert-St Louis Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Phoenix to Lambert-St Louis Airport?
As of July 2025, there are 5 operators available to choose from for flights from Phoenix to Lambert-St Louis Airport.
How old do you have to be to fly from Phoenix to Lambert-St Louis 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 layovers. It is recommended that you verify with the airline you are booking with for travel from Phoenix to Lambert-St Louis Airport.
What documentation or ID do you need to fly to Lambert-St Louis Airport?
The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Phoenix to St. Louis

Compare and see reviews for airlines that fly from Phoenix to St. Louis with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $112	Free Cancellation	Rating 5.9 3,267 reviews	Search Frontier flights
American Airlines	PriceFrom $188	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Delta	PriceFrom $216	Free Cancellation	Rating 8.0 7,951 reviews	Search Delta flights
United Airlines	PriceFrom $263	Free Cancellation	Rating 7.4 8,846 reviews	Search United Airlines flights
Southwest	PriceFrom $299	Free Cancellation	Rating 8.0 4,249 reviews	Search Southwest flights

St. Charles

Chesterfield

Hermann

Fairview Heights

Maryland Heights

Florissant

Collinsville

Fenton

Farmington

O'Fallon

St. Peters

Alton

Wentzville

Festus

Glencoe

Clayton

Eureka

Edwardsville

Grafton

Shrewsbury

Why use momondo?

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

Finding the right flight to St. Louis from Phoenix is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to St. Louis quick and easy, saving you time and money.

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

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

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Phoenix to St. Louis.

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

Price alerts on flights to St. Louis from Phoenix 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.