How many flights depart from Phoenix Sky Harbor Intl Airport to St. Louis on average per day?

As of December 2025, there are 7 flights per day flying from Phoenix Sky Harbor Intl Airport to St. Louis. The most common time of day flights depart is 9:00AM, with 41% of flights taking off at noon.

What airlines fly to St. Louis?

Southwest, American Airlines and Frontier are the top three most popular airlines that fly to St. Louis from Phoenix Sky Harbor Intl Airport according to our data. Southwest is the first choice among our users, with 43% 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 Sky Harbor Intl to Lambert-St Louis?

Frontier is the most popular carrier operating from Phoenix Sky Harbor Intl to Lambert-St Louis

How many flights depart from Phoenix Sky Harbor Intl Airport to St. Louis on average per week?

As of December 2025, there are 50 flights per week flying from Phoenix Sky Harbor Intl Airport to St. Louis. The most common day of the week flights depart is Sat, with 24% of flights taking off on this day.

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

Prices for flights from Phoenix Sky Harbor Intl Airport to Lambert-St Louis Airport refresh daily.

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

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

How old do you have to be to fly from Phoenix Sky Harbor Intl Airport to Lambert-St Louis Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Phoenix Sky Harbor Intl Airport 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.

$49 Cheap Flights from Phoenix Sky Harbor Intl Airport to St. Louis in 2025/26

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Find the cheapest flights from Phoenix Sky Harbor Intl Airport to St. Louis

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One-way

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Cheap round-trip flights

Enter your travel dates to find the best prices.

11:47 am - 9:06 pm

PHX

STL

8h 19m1 stop

3:46 pm - 11:53 pm

STL

PHX

9h 07m1 stop

$163Frontier

Thu, Jan 22 - Sat, Jan 24

4:15 pm - 8:08 pm

PHX

STL

2h 53mnonstop

9:03 pm - 11:44 pm

STL

PHX

3h 41mnonstop

$164Frontier

Fri, Jan 16 - Mon, Jan 19

4:15 pm - 8:08 pm

PHX

STL

2h 53mnonstop

10:01 pm - 8:20 am

STL

PHX

11h 19m1 stop

$165Frontier

Mon, Jan 19 - Thu, Jan 29

8:45 am - 2:48 pm

PHX

STL

5h 03m1 stop

3:46 pm - 11:53 pm

STL

PHX

9h 07m1 stop

$174Frontier

Sat, Jan 17 - Wed, Jan 28

9:30 am - 9:14 pm

PHX

STL

10h 44m1 stop

8:32 pm - 1:36 pm

STL

PHX

18h 04m2 stops

$175Multiple Airlines

Fri, Jan 16 - Mon, Jan 19

8:30 am - 2:46 pm

PHX

STL

5h 16m1 stop

1:03 pm - 3:44 pm

STL

PHX

3h 41mnonstop

$178Frontier

Wed, Jan 21 - Sun, Jan 25

11:47 am - 9:06 pm

PHX

STL

8h 19m1 stop

9:27 pm - 8:20 am

STL

PHX

11h 53m1 stop

$179Frontier

Thu, Jan 22 - Sun, Jan 25

10:31 pm - 10:02 am

PHX

STL

10h 31m1 stop

3:46 pm - 11:53 pm

STL

PHX

9h 07m1 stop

$180Frontier

Thu, Jan 1 - Sat, Jan 31

7:39 pm - 10:02 am

PHX

STL

13h 23m1 stop

5:11 pm - 1:03 pm

STL

PHX

44h 52m2 stops

$181Multiple Airlines

Tue, Jan 6 - Tue, Jan 13

2:34 pm - 9:26 pm

PHX

STL

5h 52m1 stop

1:54 pm - 12:41 am

STL

PHX

11h 47m1 stop

$182Frontier

Thu, Feb 19 - Mon, Feb 23

Frontier flights from Phoenix Sky Harbor Intl Airport to St. Louis

Our best Frontier deals on Phoenix Sky Harbor Intl Airport to St. Louis flight tickets

Frontier

Jan 22

PHX11:47 amPhoenix Sky Harbor Intl

8h 19m

1 stop

STL9:06 pmLambert-St Louis

Jan 24

STL3:46 pmLambert-St Louis

9h 07m

1 stop

PHX11:53 pmPhoenix Sky Harbor Intl

$163

Find similar

Frontier

Jan 16

PHX4:15 pmPhoenix Sky Harbor Intl

2h 53m

STL8:08 pmLambert-St Louis

Jan 19

STL9:03 pmLambert-St Louis

3h 41m

PHX11:44 pmPhoenix Sky Harbor Intl

$164

Find similar

Frontier

Jan 19

PHX4:15 pmPhoenix Sky Harbor Intl

2h 53m

STL8:08 pmLambert-St Louis

Jan 29

STL10:01 pmLambert-St Louis

11h 19m

1 stop

PHX8:20 amPhoenix Sky Harbor Intl

$165

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from Phoenix Sky Harbor Intl Airport to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 1/22

11:47 am-9:06 pm

1 stop8h 19m

Lambert-St Louis

Sat 1/24

3:46 pm-11:53 pm

1 stop9h 07m

$163

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 1/16

4:15 pm-8:08 pm

Nonstop2h 53m

Lambert-St Louis

Mon 1/19

9:03 pm-11:44 pm

Nonstop3h 41m

$164

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Mon 1/19

4:15 pm-8:08 pm

Nonstop2h 53m

Lambert-St Louis

Thu 1/29

10:01 pm-8:20 am

1 stop11h 19m

$165

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Sat 1/17

8:45 am-2:48 pm

1 stop5h 03m

Lambert-St Louis

Wed 1/28

3:46 pm-11:53 pm

1 stop9h 07m

$174

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 1/16

9:30 am-9:14 pm

1 stop10h 44m

Lambert-St Louis

Mon 1/19

8:32 pm-1:36 pm

2 stops18h 04m

$175

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 1/21

8:30 am-2:46 pm

1 stop5h 16m

Lambert-St Louis

Sun 1/25

1:03 pm-3:44 pm

Nonstop3h 41m

$178

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 1/22

11:47 am-9:06 pm

1 stop8h 19m

Lambert-St Louis

Sun 1/25

9:27 pm-8:20 am

1 stop11h 53m

$179

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 1/1

10:31 pm-10:02 am

1 stop10h 31m

Lambert-St Louis

Sat 1/31

3:46 pm-11:53 pm

1 stop9h 07m

$180

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Tue 1/6

7:39 pm-10:02 am

1 stop13h 23m

Lambert-St Louis

Tue 1/13

5:11 pm-1:03 pm

2 stops44h 52m

$181

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 2/19

2:34 pm-9:26 pm

1 stop5h 52m

Lambert-St Louis

Mon 2/23

1:54 pm-12:41 am

1 stop11h 47m

$182

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Phoenix Sky Harbor Intl Airport 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, November is the cheapest month to fly from Phoenix Sky Harbor Intl Airport to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $337. The month of October is another great option to travel to St. Louis, with average flight prices from Phoenix Sky Harbor Intl Airport averaging around $338.

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 $369. 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 $455. 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 Sky Harbor Intl Airport at noon is the least expensive time of day to depart. momondo users have found prices as low as $384 when looking at flights departing at noon. In the evening is when there is more demand to fly to St. Louis, so prices are often more expensive at around $403 per ticket.

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

Fly from Phoenix Sky Harbor Intl to Lambert-St Louis for the best Phoenix Sky Harbor Intl - 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 Sky Harbor Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to St. Louis for around $377 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 Sky Harbor Intl Airport for as low as $316 on momondo.

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

There are 3 cabin classes available to choose from on Phoenix Sky Harbor Intl 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.

Can stopping save me money on Phoenix Sky Harbor Intl Airport to St. Louis flights?

No. A direct flight is the cheapest option for a flight between Phoenix Sky Harbor Intl Airport to St. Louis.

How have Phoenix Sky Harbor Intl Airport to St. Louis flight prices changed over time?

As of December 2025, prices for Phoenix Sky Harbor Intl Airport to St. Louis flights are approximately 38% more expensive when compared to flights at the same time last year.

When to book flights from Phoenix Sky Harbor Intl Airport to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Phoenix Sky Harbor Intl Airport to St. Louis according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Phoenix Sky Harbor Intl Airport to St. Louis (PHX to STL) flight deals and tips

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

Best Price Found	$115
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 Sky Harbor Intl Airport in the past 72 hours is $115. The best round-trip flight deal from Phoenix Sky Harbor Intl Airport to St. Louis found on momondo in the last 72 hours is $283.

The fastest flight from Phoenix Sky Harbor Intl Airport to St. Louis takes 2h 50m

Direct flights go from Phoenix Sky Harbor Intl Airport to St. Louis every day.

There is 1 airport in St. Louis. From Phoenix Sky Harbor Intl Airport there are direct flights to Lambert-St Louis (STL).

Search flight deals

How far is Phoenix Sky Harbor Intl to Lambert-St Louis by plane?
The straight-line distance from Phoenix Sky Harbor Intl to Lambert-St Louis is 1265.4 mi. 2h 50m is a normal flight duration for this route.
When did momondo last update prices for flights from Phoenix Sky Harbor Intl Airport to Lambert-St Louis Airport?
Prices for flights from Phoenix Sky Harbor Intl Airport to Lambert-St Louis Airport refresh daily.
How many operators does momondo search for flights from Phoenix Sky Harbor Intl Airport to Lambert-St Louis Airport?
As of December 2025, there are 5 operators available to choose from for flights from Phoenix Sky Harbor Intl Airport to Lambert-St Louis Airport.
How old do you have to be to fly from Phoenix Sky Harbor Intl Airport to Lambert-St Louis Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Phoenix Sky Harbor Intl Airport 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.
What is the most popular plane model from Phoenix Sky Harbor Intl Airport to St. Louis?
Based on momondo bookings for flights between Phoenix Sky Harbor Intl Airport and St. Louis, the leading plane model is Boeing 737 MAX 8, making up 22.79% of the total bookings. Other popular models include Boeing 737-800 Passenger/BBJ2 (winglets) with 14.08%, Airbus A319 with 12.71%, and Airbus A320-100/200 with 10.71%.
What is the most popular airline from Phoenix Sky Harbor Intl Airport to St. Louis?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Phoenix Sky Harbor Intl Airport to St. Louis is Southwest (43% of total bookings). The next most popular airlines are American Airlines (34%), Frontier (20%), and Delta (2%).

Best airlines flying from Phoenix Sky Harbor Intl Airport to St. Louis

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

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $120	Free Cancellation	Rating 5.8 3,078 reviews	Search Frontier flights
United Airlines	PriceFrom $198	Free Cancellation	Rating 7.4 9,102 reviews	Search United Airlines flights
American Airlines	PriceFrom $229	Free Cancellation	Rating 7.2 11,052 reviews	Search American Airlines flights
Delta	PriceFrom $259	Free Cancellation	Rating 7.9 8,014 reviews	Search Delta flights
Southwest	PriceFrom $262	Free Cancellation	Rating 8.0 4,254 reviews	Search Southwest flights

Southwest Flights From Phoenix Sky Harbor Intl Airport to St. Louis
Across 28 Southwest flights from Phoenix Sky Harbor Intl Airport to St. Louis this week, the average price was $398, with the best Southwest deals starting from $262 round-trip. 4,254 users have rated Southwest on momondo, with an average score of 8.0/10.
American Airlines Flights From Phoenix Sky Harbor Intl Airport to St. Louis
$229 is the best American Airlines flight deal from Phoenix Sky Harbor Intl Airport to St. Louis found on momondo over the last 72 hours. The average American Airlines ticket price found was closer to $394, however, with flight time and availability significantly affecting the price. American Airlines (7.2/10 from 11,052 user reviews) flies into St. Louis from Phoenix Sky Harbor Intl Airport 10 times in an average week so prices can vary.

St. Charles

Chesterfield

Hermann

Fairview Heights

Maryland Heights

O'Fallon

Florissant

Fenton

St. Peters

Wentzville

Collinsville

Alton

Farmington

Clayton

Festus

Glencoe

Eureka

Edwardsville

Litchfield

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?

momondo does allow users to show only those flights to St. Louis from Phoenix which offer a flexible booking policy as well as other useful filters and features.

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

momondo helps you find the best flight between Phoenix and St. Louis 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 Phoenix to St. Louis right now. Can momondo alert me if prices change?

If you are not ready to book a flight from Phoenix to St. Louis now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to St. Louis and let you know when they change.

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

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Cheap flights from Phoenix Sky Harbor Intl Airport to St. Louis from $49

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Frontier flights from Phoenix Sky Harbor Intl Airport to St. Louis

Our best Frontier deals on Phoenix Sky Harbor Intl Airport to St. Louis flight tickets

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Use the filters below to find and compare flights from Phoenix Sky Harbor Intl Airport to St. Louis that are best for you.

See travel insights to St. Louis from

How to get the cheapest flight ticket from Phoenix Sky Harbor Intl Airport to St. Louis

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

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

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

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

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

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

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

There are 3 cabin classes available to choose from on Phoenix Sky Harbor Intl 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.

Can stopping save me money on Phoenix Sky Harbor Intl Airport to St. Louis flights?

No. A direct flight is the cheapest option for a flight between Phoenix Sky Harbor Intl Airport to St. Louis.

How have Phoenix Sky Harbor Intl Airport to St. Louis flight prices changed over time?

As of December 2025, prices for Phoenix Sky Harbor Intl Airport to St. Louis flights are approximately 38% more expensive when compared to flights at the same time last year.

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

Frontier is the most popular carrier operating from Phoenix Sky Harbor Intl to Lambert-St Louis

What airlines fly to St. Louis?

How many flights depart from Phoenix Sky Harbor Intl Airport to St. Louis on average per day?

As of December 2025, there are 7 flights per day flying from Phoenix Sky Harbor Intl Airport to St. Louis. The most common time of day flights depart is 9:00AM, with 41% of flights taking off at noon.

How many flights depart from Phoenix Sky Harbor Intl Airport to St. Louis on average per week?

As of December 2025, there are 50 flights per week flying from Phoenix Sky Harbor Intl Airport to St. Louis. The most common day of the week flights depart is Sat, with 24% of flights taking off on this day.

When to book flights from Phoenix Sky Harbor Intl Airport to St. Louis

Cheap Phoenix Sky Harbor Intl Airport to St. Louis (PHX to STL) flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in St. Louis

How far is Phoenix Sky Harbor Intl to Lambert-St Louis by plane?

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

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

How old do you have to be to fly from Phoenix Sky Harbor Intl Airport to Lambert-St Louis Airport?

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

What is the most popular plane model from Phoenix Sky Harbor Intl Airport to St. Louis?

What is the most popular airline from Phoenix Sky Harbor Intl Airport to St. Louis?

Best airlines flying from Phoenix Sky Harbor Intl Airport to St. Louis

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

Southwest Flights From Phoenix Sky Harbor Intl Airport to St. Louis

American Airlines Flights From Phoenix Sky Harbor Intl Airport to St. Louis

Traveling to a place near St. Louis?

Why use momondo?

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

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

How can momondo help me find flights 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?

An easier way to manage your St. Louis trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Missouri