Find Cheap Flights from St. Louis to Phoenix (STL - PHX)

Flights overview

Useful information for finding cheap flights from St. Louis to Phoenix and booking your next trip

Cheapest round-trip flights	$154	Frontier 1 stop 17 hr Thu, Feb 5 — Wed, Feb 11	The cheapest round-trip flight from St. Louis to Phoenix is currently $154
Cheapest one-way flight	$70	Frontier 1 stop 19 hr Sat, Feb 21	The cheapest one-way flight from St. Louis to Phoenix is currently $70
Cheapest nonstop flights	$218	Frontier Nonstop 4 hr Thu, Mar 19 — Thu, Mar 26	The cheapest nonstop round-trip flight from St. Louis to Phoenix is currently $218
Last-minute weekend getaway	$266	Frontier Nonstop 4 hr Fri, Jan 23 — Sun, Jan 25	The cheapest last-minute weekend getaway from St. Louis to Phoenix is currently $266
Cheapest business class flights	$875	Delta 1 stop 7 hr Sat, Apr 4 — Sat, Apr 11	The cheapest business class round-trip flight from St. Louis to Phoenix is currently $875

Fastest flight	3 hr 20 min	The fastest nonstop flight from St. Louis to Phoenix takes 3 hr 20 min
Nonstop flights	Every day	There are direct flights on this route every day.

When is the cheapest time to fly?

The cheapest month to fly from St. Louis to Phoenix is typically October. The most expensive month to fly is typically June.

October Cheapest	Typical prices: $135–205
June Most expensive	Typical prices: $230–340

Popular airlines from St. Louis to Phoenix

Southwest

Nonstop

from $315

Typical price: $295–475

28 weekly nonstop flights

STL - PHX Every day

1079 weekly connecting flights

STL - PHX Every day
American

Nonstop

from $315

Typical price: $290–495

14 weekly nonstop flights

STL - PHX Every day

502 weekly connecting flights

STL - PHX Every day
United

from $257

Typical price: $315–550

286 weekly connecting flights

STL - PHX Every day
Delta

from $335

Typical price: $315–670

189 weekly connecting flights

STL - PHX Every day
Frontier

Nonstop

from $154

Typical price: $160–385

2 weekly nonstop flights

STL - PHX Every Fri, Sun

19 weekly connecting flights

STL - PHX Every Mon, Wed, Thu, Fri, Sat, Sun
Alaska

from $323

Typical price: $435–920

21 weekly connecting flights

STL - PHX Every day

Popular airports near St. Louis

St. Louis Lambert International Airport (STL)

St. Louis United States 21 min 12 mi
General Wayne A. Downing Peoria International Airport (PIA)

Peoria United States 2 hr 35 min 143 mi
MidAmerica St. Louis Airport (BLV)

Belleville United States 34 min 20 mi
Indianapolis International Airport (IND)

Indianapolis United States 3 hr 29 min 222 mi

Popular airports near Phoenix

Phoenix Sky Harbor International Airport (PHX)

Phoenix United States 12 min 3 mi
Mesa Gateway Airport (AZA)

Phoenix United States 41 min 25 mi
Tucson International Airport (TUS)

Tucson United States 1 hr 53 min 112 mi
Scottsdale Airport (SCF)

Phoenix United States 31 min 15 mi

Frequently asked questions about flying from St. Louis to Phoenix

The cheapest flights from St. Louis to Phoenix are usually in October. Typical ticket prices in October range from $135 to $205.

The cheapest round-trip flight from St. Louis to Phoenix recently found on Google Flights was with Frontier from $154. The cheapest one-way flight was with Frontier from $70.

Some of the cheapest round-trip deals we found with different airlines:

The cheapest Southwest flight from St. Louis to Phoenix is $315, flying from Feb 28 to Mar 7.
The cheapest American flight from St. Louis to Phoenix is $315, flying from Feb 21 to Feb 28.
The cheapest United flight from St. Louis to Phoenix is $257, flying from Apr 18 to Apr 25.
The cheapest Delta flight from St. Louis to Phoenix is $335, flying from Apr 4 to Apr 11.
The cheapest Frontier flight from St. Louis to Phoenix is $154, flying from Feb 5 to Feb 11.
The cheapest Alaska flight from St. Louis to Phoenix is $323, flying from Mar 2 to Mar 11.

The cheapest round-trip flight from St. Louis to Phoenix starts at $154 from Thu, Feb 5 to Wed, Feb 11. The cheapest one-way flight starts at $70 and departs on Sat, Feb 21.

3 hr 20 min is the shortest flight time from St. Louis to Phoenix.

Most visitors arrive Dec–May, when the weather is warm and dry. Summers (May–Sep) are very hot. Local events include the Phoenix Open professional golf tournament (late Jan–early Feb), the Arizona State Fair (Oct) and the Arizona National Livestock Show (Dec).

It's easy to use Google Flights to find the cheapest days to fly from St. Louis to Phoenix.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.

What counts as the best airline for your flights from St. Louis to Phoenix really depends on your individual needs. You may have a favorite carrier or a loyalty program you like, but price, convenience, and airports served also come into play. Flexibility and booking terms – Can you change flights if you want to stay longer or get a refund if you have to postpone your trip? – are also factors that help determine which airline is best to fly from St. Louis to Phoenix.

In terms of nonstop flights, Southwest is the most popular. Southwest offers 28 nonstop flights and 1,079 connecting flights per week. Southwest flies from St. Louis Lambert International Airport (STL) to Phoenix Sky Harbor International Airport (PHX) .

Other popular airlines flying from St. Louis to Phoenix are:

American offers 14 nonstop flights and 502 connecting flights per week. American flies from St. Louis Lambert International Airport (STL) to Phoenix Sky Harbor International Airport (PHX) .
United offers 286 connecting flights per week. United flies from St. Louis Lambert International Airport (STL) to Phoenix Sky Harbor International Airport (PHX) .
Delta offers 189 connecting flights per week. Delta flies from St. Louis Lambert International Airport (STL) to Phoenix Sky Harbor International Airport (PHX) .
Frontier offers 2 nonstop flights and 19 connecting flights per week. Frontier flies from St. Louis Lambert International Airport (STL) to Phoenix Sky Harbor International Airport (PHX) .
Alaska offers 21 connecting flights per week. Alaska flies from St. Louis Lambert International Airport (STL) to Phoenix Sky Harbor International Airport (PHX) .

The number of connecting flights refers to distinct flights with at least one stop between St. Louis and Phoenix.

The cheapest round-trip flight from St. Louis to Phoenix recently found on Google Flights was with Frontier from $154. The cheapest one-way flight was with Frontier from $70.

Some of the cheapest round-trip deals we found with different airlines:

The cheapest Southwest flight from St. Louis to Phoenix is $315, flying from Feb 28 to Mar 7.
The cheapest American flight from St. Louis to Phoenix is $315, flying from Feb 21 to Feb 28.
The cheapest United flight from St. Louis to Phoenix is $257, flying from Apr 18 to Apr 25.
The cheapest Delta flight from St. Louis to Phoenix is $335, flying from Apr 4 to Apr 11.
The cheapest Frontier flight from St. Louis to Phoenix is $154, flying from Feb 5 to Feb 11.
The cheapest Alaska flight from St. Louis to Phoenix is $323, flying from Mar 2 to Mar 11.

Southwest, American and Frontier fly direct from St. Louis to Phoenix.

There are 28 Southwest direct flights from St. Louis to Phoenix per week. Flights are available every day.
There are 14 American direct flights from St. Louis to Phoenix per week. Flights are available every day.
There are 2 Frontier direct flights from St. Louis to Phoenix per week. Flights are available on Friday and Sunday.

Use the Stops filter while searching for flights, to see only nonstop options in your results.

The cheapest last-minute deal between St. Louis and Phoenix at price $266 is offered by Frontier from Fri, Jan 23 to Sun, Jan 25.

Southwest, American and Frontier fly direct from St. Louis to Phoenix.

There are 28 Southwest direct flights from St. Louis to Phoenix per week. Flights are available every day.
There are 14 American direct flights from St. Louis to Phoenix per week. Flights are available every day.
There are 2 Frontier direct flights from St. Louis to Phoenix per week. Flights are available on Friday and Sunday.

Use the Stops filter while searching for flights, to see only nonstop options in your results.

There are direct flights from St. Louis to Phoenix on a daily basis.

The cheapest direct (nonstop) round-trip flights between St. Louis and Phoenix start at $218 from Thu, Mar 19 to Thu, Mar 26 with Frontier.

It's easy to find nonstop flights with Google Flights! Once you've searched for flights from St. Louis to Phoenix, just select the nonstop flights only option in the 'Stops’ filter in the search form and view all available direct flights and their prices.

The cheapest business class round-trip flights between St. Louis and Phoenix start at $875 from Sat, Apr 4 to Sat, Apr 11 with Delta.

The cheapest economy class round-trip flights between St. Louis and Phoenix start at $154 from Thu, Feb 5 to Wed, Feb 11.

To book business class trips from St. Louis to Phoenix, look for the default Economy selection at the top, and change it to your desired cabin class such as Premium Economy, Business Class, or First Class. You can then select your departure and arrival dates, consider available options, and book your business travel.

You can also adjust the trip type to view one-way fares.

The best last-minute getaway deal for the next weekend between St. Louis and Phoenix starts at $266 from Fri, Jan 23 to Sun, Jan 25 with Frontier.

The cheapest last-minute deal between St. Louis and Phoenix at price $266 is offered by Frontier from Fri, Jan 23 to Sun, Jan 25.

To find last-minute flight deals from St. Louis to Phoenix, start by entering the city names, select the desired departure and return dates, and hit the Search button to view flight options.

You can check for last-minute flights for the same day or adjust the trip type to see one-way fares.