Cheap flights from St. Louis, MO to Phoenix, AZ

Flights starting at $45. Choose between Frontier Airlines, United Airlines, or Allegiant Air to find the best price.

Make your travel wishlist, we'll do the rest
Hidden deals
Effortless booking
Travel hacking

Tips to know when travelling to Phoenix

Mailbox
Receive exclusive deals by email
Book your trip to arrive at Phoenix Sky Harbor International, or Phoenix–Mesa Gateway. The most popular airlines for this route are Frontier Airlines, United Airlines, Allegiant Air, Spirit Airlines, and Southern Airways Express. St. Louis and Phoenix have 204 direct flights per week.

Weekly direct flights

Discover the top airlines offering direct flights from St. Louis to Phoenix in the next month. You’ll find the number of daily direct flights per airline in the table.

Weekly direct flights for Sun 07.04 - Sat 13.04

AirlineSun 07.04Mon 08.04Tue 09.04Wed 10.04Thu 11.04Fri 12.04Sat 13.04
---------------------

Weekly direct flights for Sun 14.04 - Sat 20.04

AirlineSun 14.04Mon 15.04Tue 16.04Wed 17.04Thu 18.04Fri 19.04Sat 20.04
---------------------

Weekly direct flights for Sun 21.04 - Sat 27.04

AirlineSun 21.04Mon 22.04Tue 23.04Wed 24.04Thu 25.04Fri 26.04Sat 27.04
---------------------

Weekly direct flights for Sun 28.04 - Sat 04.05

AirlineSun 28.04Mon 29.04Tue 30.04Wed 01.05Thu 02.05Fri 03.05Sat 04.05
---------------------

Check-in for a flight from St. Louis to Phoenix

NameCarrier codeIATA CodePassport needed during bookingOnline check-in available
Frontier AirlinesFFTF9NoOpens 24 days before flight
Closes 1 hours before flight
United AirlinesUALUAYesNo
Allegiant AirAAYG4NoOpens 24 days before flight
Closes 1 hours before flight
Spirit AirlinesNKSNKNoOpens 24 days before flight
Closes 1 hours before flight
Southern Airways ExpressFDY9XYesNo

Weather in Phoenix

Average Weather

MonthAverage monthly max temperatureAverage monthly min temperature
January19°C7°C
February21°C9°C
March25°C12°C
April30°C16°C
May34°C20°C
June40°C25°C
July40°C29°C
August40°C29°C
September37°C26°C
October31°C19°C
November25°C12°C
December18°C8°C
Hottest Month
40°C
July
Coldest month
7°C
January
Sunny days
341
days per year

14 day forecast

Thursday
4 Apr
29°C18°C
11 Apr
33°C21°C
Friday
5 Apr
80%
17°C12°C
12 Apr
30°C24°C
Saturday
6 Apr
17°C8°C
13 Apr
86%
29°C22°C
Sunday
7 Apr
21°C13°C
14 Apr
31°C22°C
Monday
8 Apr
22°C16°C
15 Apr
32°C23°C
Tuesday
9 Apr
27°C16°C
16 Apr
35°C24°C
Wednesday
10 Apr
29°C18°C
17 Apr
31°C25°C

Frequently asked questions

What are the most popular routes to and from St. Louis?
What are the most popular routes to and from Phoenix?
What airports are near St. Louis?
What airports are near Phoenix?
Is it possible to combine flights, buses, and trains in one itinerary when traveling between St. Louis and Phoenix?
What is Virtual Interlining and how do I use it?
Which airlines fly between St. Louis and Phoenix?
When's the best time to travel between St. Louis and Phoenix?
What flights operate between St. Louis and Phoenix?
How many airports are there near St. Louis?
How many airports are there near Phoenix?
What time do nonstop (direct) flights between St. Louis and Phoenix depart?
What time do nonstop (direct) flights between St. Louis and Phoenix arrive?
What time do flights between St. Louis and Phoenix depart?
What time do flights between St. Louis and Phoenix arrive?

Explore alternative trips

Flights from St. Louis

Flights to Phoenix

Popular routes

The nearest countries with flights to Phoenix

Here is a list of countries people are flying from

Other destination countries from St. Louis

Here is a list of countries people are flying to
Find the best connection from St. Louis to Phoenix
Search flights, trains & buses
We hack the system,
you fly for less