Cheap flights from St. Louis to Phoenix

Flights overview

Useful information for finding cheap flights from St. Louis to Phoenix and booking your next trip
Cheapest round-trip flights $190
Frontier 1 stop 27 hr Thu, Apr 23 — Wed, Apr 29
The cheapest round-trip flight from St. Louis to Phoenix is currently $190
Cheapest one-way flight $95
Frontier 1 stop 9 hr Wed, Apr 15
The cheapest one-way flight from St. Louis to Phoenix is currently $95
Cheapest nonstop flights $323
American Nonstop 4 hr Sat, May 9 — Sat, May 16
The cheapest nonstop round-trip flight from St. Louis to Phoenix is currently $323
Last-minute weekend getaway $301
Frontier Nonstop 4 hr Thu, Mar 12 — Sun, Mar 15
The cheapest last-minute weekend getaway from St. Louis to Phoenix is currently $301
Cheapest business class flights $414
Frontier 1 stop 6 hr Sat, Apr 25 — Sat, May 2
The cheapest business class round-trip flight from St. Louis to Phoenix is currently $414
Fastest flight 3 hr 10 min The fastest nonstop flight from St. Louis to Phoenix takes 3 hr 10 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 $323
    Typical price: $295–450
    38 weekly nonstop flights
    STL - PHX Every day
    1018 weekly connecting flights
    STL - PHX Every day
  • American
    Nonstop
    from $295
    Typical price: $290–455
    13 weekly nonstop flights
    STL - PHX Every day
    437 weekly connecting flights
    STL - PHX Every day
  • United
    from $295
    Typical price: $310–520
    328 weekly connecting flights
    STL - PHX Every day
  • Delta
    from $343
    Typical price: $315–660
    230 weekly connecting flights
    STL - PHX Every day
  • Frontier
    Nonstop
    from $190
    Typical price: $170–370
    3 weekly nonstop flights
    STL - PHX Every Thu, Fri, Sun
    20 weekly connecting flights
    STL - PHX Every day
  • Alaska
    from $403
    Typical price: $430–900
    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
  • Columbia Regional Airport (COU)
    Columbia United States 2 hr 7 min 109 mi
  • MidAmerica St. Louis Airport (BLV)
    Belleville United States 34 min 20 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 $190. The cheapest one-way flight was with Frontier from $95.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from St. Louis to Phoenix is $323, flying from Apr 11 to Apr 18.
  • The cheapest American flight from St. Louis to Phoenix is $295, flying from May 2 to May 9.
  • The cheapest United flight from St. Louis to Phoenix is $295, flying from May 2 to May 9.
  • The cheapest Delta flight from St. Louis to Phoenix is $343, flying from Jun 6 to Jun 13.
  • The cheapest Frontier flight from St. Louis to Phoenix is $190, flying from Apr 23 to Apr 29.
  • The cheapest Alaska flight from St. Louis to Phoenix is $403, flying from Apr 24 to May 2.
The cheapest round-trip flight from St. Louis to Phoenix starts at $190 from Thu, Apr 23 to Wed, Apr 29. The cheapest one-way flight starts at $95 and departs on Wed, Apr 15.
3 hr 10 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 38 nonstop flights and 1,018 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 13 nonstop flights and 437 connecting flights per week. American flies from St. Louis Lambert International Airport (STL) to Phoenix Sky Harbor International Airport (PHX) .
  • United offers 328 connecting flights per week. United flies from St. Louis Lambert International Airport (STL) to Phoenix Sky Harbor International Airport (PHX) .
  • Delta offers 230 connecting flights per week. Delta flies from St. Louis Lambert International Airport (STL) to Phoenix Sky Harbor International Airport (PHX) .
  • Frontier offers 3 nonstop flights and 20 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 $190. The cheapest one-way flight was with Frontier from $95.

Some of the cheapest round-trip deals we found with different airlines:
  • The cheapest Southwest flight from St. Louis to Phoenix is $323, flying from Apr 11 to Apr 18.
  • The cheapest American flight from St. Louis to Phoenix is $295, flying from May 2 to May 9.
  • The cheapest United flight from St. Louis to Phoenix is $295, flying from May 2 to May 9.
  • The cheapest Delta flight from St. Louis to Phoenix is $343, flying from Jun 6 to Jun 13.
  • The cheapest Frontier flight from St. Louis to Phoenix is $190, flying from Apr 23 to Apr 29.
  • The cheapest Alaska flight from St. Louis to Phoenix is $403, flying from Apr 24 to May 2.
Southwest, American and Frontier fly direct from St. Louis to Phoenix.
  • There are 38 Southwest direct flights from St. Louis to Phoenix per week. Flights are available every day.
  • There are 13 American direct flights from St. Louis to Phoenix per week. Flights are available every day.
  • There are 3 Frontier direct flights from St. Louis to Phoenix per week. Flights are available on Thursday, 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 $301 is offered by Frontier from Thu, Mar 12 to Sun, Mar 15.
Southwest, American and Frontier fly direct from St. Louis to Phoenix.
  • There are 38 Southwest direct flights from St. Louis to Phoenix per week. Flights are available every day.
  • There are 13 American direct flights from St. Louis to Phoenix per week. Flights are available every day.
  • There are 3 Frontier direct flights from St. Louis to Phoenix per week. Flights are available on Thursday, 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 $323 from Sat, May 9 to Sat, May 16 with American.
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 $414 from Sat, Apr 25 to Sat, May 2 with Frontier.
The cheapest economy class round-trip flights between St. Louis and Phoenix start at $190 from Thu, Apr 23 to Wed, Apr 29.
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 $301 from Thu, Mar 12 to Sun, Mar 15 with Frontier.
The cheapest last-minute deal between St. Louis and Phoenix at price $301 is offered by Frontier from Thu, Mar 12 to Sun, Mar 15.
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.

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