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 Sky Harbor Intl Airport according to our data. American Airlines is the first choice among our users, with 39% 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?

Southwest, Frontier, and American Airlines are the most popular carriers 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 day?

As of August 2025, there are 3 flights per day flying from Phoenix Sky Harbor Intl Airport to St. Louis. The most common time of day flights depart is 12:00PM, with 37% of flights taking off in the afternoon.

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

As of August 2025, there are 24 flights per week flying from Phoenix Sky Harbor Intl Airport to St. Louis. The most common day of the week flights depart is Mon, with 33% of flights taking off on this day.

Which layover airport offers the lowest fares from Phoenix Sky Harbor Intl Airport to St. Louis?

Flights via Denver (DEN) offer the lowest average round-trip price of $208.

Which layover airport has the shortest connection time from Phoenix Sky Harbor Intl Airport to St. Louis?

Salt Lake City (SLC) has the shortest average layover time for this route: 1h 13m.

Which airport is the most popular layover for flights between Phoenix Sky Harbor Intl Airport and St. Louis?

Salt Lake City (SLC) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest travel time from Phoenix Sky Harbor Intl Airport to St. Louis?

Flights connecting via Salt Lake City (SLC) have the shortest average one-way travel time: 5h 28m.

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 August 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.

$73 Cheap Flights from Phoenix Sky Harbor Intl Airport to St. Louis (PHX-STL) in 2025

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Find the cheapest flights from Phoenix Sky Harbor Intl Airport to St. Louis (PHX-STL)

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

7:11 pm - 12:16 amPHX-STL

3h 05mnonstop

8:00 am - 9:29 amSTL-PHX

3h 29mnonstop

$147American Airlines

Find Deal

Thu, Aug 28 - Thu, Sep 4

5:40 pm - 10:35 pmPHX-STL

2h 55mnonstop

6:15 am - 7:30 amSTL-PHX

3h 15mnonstop

$155Southwest

Find Deal

Wed, Sep 3 - Wed, Sep 10

11:55 am - 4:50 pmPHX-STL

2h 55mnonstop

8:45 pm - 10:05 pmSTL-PHX

3h 20mnonstop

$161Southwest

Find Deal

Wed, Oct 22 - Wed, Oct 22

12:59 pm - 6:00 pmPHX-STL

3h 01mnonstop

6:18 pm - 7:34 pmSTL-PHX

3h 16mnonstop

$195American Airlines

Find Deal

Fri, Sep 5 - Thu, Sep 11

1:20 pm - 9:16 pmPHX-STL

5h 56m1 stop

7:00 pm - 11:36 pmSTL-PHX

6h 36m1 stop

$237Delta

Find Deal

Wed, Sep 3 - Thu, Sep 11

6:02 pm - 11:27 amPHX-STL

15h 25m1 stop

7:34 am - 12:22 pmSTL-PHX

6h 48m1 stop

$240Sun Country Air

Find Deal

Thu, Sep 18 - Sun, Sep 21

8:00 am - 12:59 pmPHX-STL

2h 59mnonstop

7:52 pm - 9:55 pmSTL-PHX

28h 03m1 stop

$242Frontier

Find Deal

Fri, Oct 10 - Tue, Oct 14

6:00 am - 1:53 pmPHX-STL

5h 53m1 stop

2:54 pm - 4:16 pmSTL-PHX

3h 22mnonstop

$243Frontier

Find Deal

Thu, Oct 2 - Fri, Oct 10

5:15 pm - 12:24 amPHX-STL

5h 09m1 stop

5:30 pm - 9:35 pmSTL-PHX

6h 05m1 stop

$244Delta

Find Deal

Thu, Oct 23 - Sat, Oct 25

6:02 pm - 11:27 amPHX-STL

15h 25m1 stop

7:34 am - 12:22 pmSTL-PHX

6h 48m1 stop

$245Sun Country Air

Find Deal

Thu, Sep 18 - Sun, Sep 21

American Airlines flights from Phoenix Sky Harbor Intl Airport to St. Louis

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

American Airlines

Aug 28

PHX7:11 pmPhoenix Sky Harbor Intl

3h 05m

STL12:16 amLambert-St Louis

Sep 4

STL8:00 amLambert-St Louis

3h 29m

PHX9:29 amPhoenix Sky Harbor Intl

$147

Find similar

American Airlines

Sep 5

PHX12:59 pmPhoenix Sky Harbor Intl

3h 01m

STL6:00 pmLambert-St Louis

Sep 11

STL6:18 pmLambert-St Louis

3h 16m

PHX7:34 pmPhoenix Sky Harbor Intl

$195

Find similar

American Airlines

Oct 23

PHX6:50 pmPhoenix Sky Harbor Intl

3h 07m

STL11:57 pmLambert-St Louis

Oct 25

STL7:31 amLambert-St Louis

3h 34m

PHX9:05 amPhoenix Sky Harbor Intl

$196

Find similar

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

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

Southwest

Sep 3

PHX5:40 pmPhoenix Sky Harbor Intl

2h 55m

STL10:35 pmLambert-St Louis

Sep 10

STL6:15 amLambert-St Louis

3h 15m

PHX7:30 amPhoenix Sky Harbor Intl

$155

Find similar

Southwest

Oct 22

PHX11:55 amPhoenix Sky Harbor Intl

2h 55m

STL4:50 pmLambert-St Louis

Oct 22

STL8:45 pmLambert-St Louis

3h 20m

PHX10:05 pmPhoenix Sky Harbor Intl

$161

Find similar

Southwest

Sep 10

PHX5:40 pmPhoenix Sky Harbor Intl

2h 55m

STL10:35 pmLambert-St Louis

Sep 15

STL5:55 amLambert-St Louis

3h 15m

PHX7:10 amPhoenix Sky Harbor Intl

$180

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 8/28

7:11 pm-12:16 am

Nonstop3h 05m

Lambert-St Louis

Thu 9/4

8:00 am-9:29 am

Nonstop3h 29m

$147

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 9/3

5:40 pm-10:35 pm

Nonstop2h 55m

Lambert-St Louis

Wed 9/10

6:15 am-7:30 am

Nonstop3h 15m

$155

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 10/22

11:55 am-4:50 pm

Nonstop2h 55m

Lambert-St Louis

Wed 10/22

8:45 pm-10:05 pm

Nonstop3h 20m

$161

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 9/5

12:59 pm-6:00 pm

Nonstop3h 01m

Lambert-St Louis

Thu 9/11

6:18 pm-7:34 pm

Nonstop3h 16m

$195

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Wed 9/3

1:20 pm-9:16 pm

1 stop5h 56m

Lambert-St Louis

Thu 9/11

7:00 pm-11:36 pm

1 stop6h 36m

$237

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 9/18

6:02 pm-11:27 am

1 stop15h 25m

Lambert-St Louis

Sun 9/21

7:34 am-12:22 pm

1 stop6h 48m

$240

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Fri 10/10

8:00 am-12:59 pm

Nonstop2h 59m

Lambert-St Louis

Tue 10/14

7:52 pm-9:55 pm

1 stop28h 03m

$242

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 10/2

6:00 am-1:53 pm

1 stop5h 53m

Lambert-St Louis

Fri 10/10

2:54 pm-4:16 pm

Nonstop3h 22m

$243

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 10/23

5:15 pm-12:24 am

1 stop5h 09m

Lambert-St Louis

Sat 10/25

5:30 pm-9:35 pm

1 stop6h 05m

$244

PhoenixSt. Louis

PHX - STL

PHXSTL

Phoenix Sky Harbor Intl

Thu 9/18

6:02 pm-11:27 am

1 stop15h 25m

Lambert-St Louis

Sun 9/21

7:34 am-12:22 pm

1 stop6h 48m

$245

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

Layovers

Other information

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

In general, September 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 $298. The month of August is another great option to travel to St. Louis, with average flight prices from Phoenix Sky Harbor Intl Airport averaging around $309.

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 $397. 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 $451. 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 in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $396 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 $454 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 $388 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 $334 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?

You could potentially save up to 31% on your flight if you consider stops on a Phoenix Sky Harbor Intl Airport to St. Louis flight.

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

As of August 2025, prices for Phoenix Sky Harbor Intl Airport to St. Louis flights are approximately 2% cheaper 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	$73
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 $73. The best round-trip flight deal from Phoenix Sky Harbor Intl Airport to St. Louis found on momondo in the last 72 hours is $147.

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 near St. Louis: 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 August 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 737-800 Passenger/BBJ2 (winglets), making up 19.60% of the total bookings. Other popular models include Boeing 737-700 Passenger/BBJ1 (winglets) with 19.17%, Boeing 737 MAX 8 with 18.64%, and Boeing 737-800 with 15.47%.
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 (39% of total bookings). The next most popular airlines are American Airlines (38%), Frontier (21%), 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 $116	Free Cancellation	Rating 5.8 3,232 reviews	Search Frontier flights
American Airlines	PriceFrom $239	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
Delta	PriceFrom $259	Free Cancellation	Rating 8.0 7,987 reviews	Search Delta flights
United Airlines	PriceFrom $263	Free Cancellation	Rating 7.4 8,912 reviews	Search United Airlines flights
Southwest	PriceFrom $297	Free Cancellation	Rating 8.0 4,246 reviews	Search Southwest flights

Southwest Flights From Phoenix Sky Harbor Intl Airport to St. Louis
Across 8 Southwest flights from Phoenix Sky Harbor Intl Airport to St. Louis this week, the average price was $413, with the best Southwest deals starting from $297 round-trip. 4,246 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
$239 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 $405, however, with flight time and availability significantly affecting the price. American Airlines (7.2/10 from 10,000 user reviews) flies into St. Louis from Phoenix Sky Harbor Intl Airport 8 times in an average week so prices can vary.

St. Charles

Chesterfield

Hermann

Fairview Heights

Maryland Heights

Florissant

Fenton

Collinsville

O'Fallon

Alton

St. Peters

Farmington

Wentzville

Festus

Glencoe

Eureka

Edwardsville

Clayton

Shrewsbury

Grafton

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 $73

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American Airlines flights from Phoenix Sky Harbor Intl Airport to St. Louis

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

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

Our best Southwest 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

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

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?

You could potentially save up to 31% on your flight if you consider stops on a Phoenix Sky Harbor Intl Airport to St. Louis flight.

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

As of August 2025, prices for Phoenix Sky Harbor Intl Airport to St. Louis flights are approximately 2% cheaper 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?

Southwest, Frontier, and American Airlines are the most popular carriers operating from Phoenix Sky Harbor Intl to Lambert-St Louis

What airlines fly to St. Louis?

Which airport is the most popular layover for flights between Phoenix Sky Harbor Intl Airport and St. Louis?

Salt Lake City (SLC) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport offers the lowest fares from Phoenix Sky Harbor Intl Airport to St. Louis?

Flights via Denver (DEN) offer the lowest average round-trip price of $208.

Which layover airport has the shortest travel time from Phoenix Sky Harbor Intl Airport to St. Louis?

Flights connecting via Salt Lake City (SLC) have the shortest average one-way travel time: 5h 28m.

Which layover airport has the shortest connection time from Phoenix Sky Harbor Intl Airport to St. Louis?

Salt Lake City (SLC) has the shortest average layover time for this route: 1h 13m.

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

As of August 2025, there are 3 flights per day flying from Phoenix Sky Harbor Intl Airport to St. Louis. The most common time of day flights depart is 12:00PM, with 37% of flights taking off in the afternoon.

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

As of August 2025, there are 24 flights per week flying from Phoenix Sky Harbor Intl Airport to St. Louis. The most common day of the week flights depart is Mon, with 33% 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