Southwest® flights from Phoenix to St. Louis from $199

Promo Code

Low fares from Phoenix to St. Louis

$

Phoenix (PHX)to

St. Louis (STL)
Depart: 10/19/2026

One-way

Basic

From
$199
Seen: 19 hrs ago

Phoenix (PHX)to

St. Louis (STL)
Depart: 10/24/2026

One-way

Basic

From
$199
Seen: 21 hrs ago

Phoenix (PHX)to

St. Louis (STL)
Depart: 10/06/2026

One-way

Basic

From
$199
Seen: 21 hrs ago

Phoenix (PHX)to

St. Louis (STL)
Depart: 10/14/2026

One-way

Basic

From
$199
Seen: 23 hrs ago

Phoenix (PHX)to

St. Louis (STL)
Depart: 12/14/2026

One-way

Basic

From
$199
Seen: 16 hrs ago

Phoenix (PHX)to

St. Louis (STL)
Depart: 10/17/2026

One-way

Basic

From
$199
Seen: 14 hrs ago

Looking for more low-fare flights?

Check out the Low Fare Calendar to find a fare that works for you. Just choose the month you want to depart and return, and we’ll show you the best fares available.

Find low fares

Explore flights from Phoenix to St. Louis

Sep 2026
From$199*
Seen: 10 hrs ago
One Way/Basic
Oct 2026
From$199*
Seen: 16 hrs ago
One Way/Basic
Nov 2026
From$199*
Seen: 17 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $199
cmp-daily-histogram-bars-legend-max-price-aria-label $347
Displaying fares for September-2026
  • PHX–STL, 09/10/2026: From $337
    10

    Thu

    SEP

  • PHX–STL, 09/11/2026: From $337
    11

    Fri

  • PHX–STL, 09/12/2026: From $291
    12

    Sat

  • PHX–STL: cmp-view-offers-disclaimer. Find Offers
    13

    Sun

  • PHX–STL, 09/14/2026: From $347
    14

    Mon

  • PHX–STL, 09/15/2026: From $291
    15

    Tue

  • PHX–STL, 09/16/2026: From $291
    16

    Wed

  • PHX–STL, 09/17/2026: From $337
    17

    Thu

  • PHX–STL, 09/18/2026: From $337
    18

    Fri

  • PHX–STL, 09/19/2026: From $291
    19

    Sat

  • PHX–STL, 09/20/2026: From $337
    20

    Sun

  • PHX–STL, 09/21/2026: From $337
    21

    Mon

  • PHX–STL, 09/22/2026: From $291
    22

    Tue

  • PHX–STL, 09/23/2026: From $291
    23

    Wed

  • PHX–STL: cmp-view-offers-disclaimer. Find Offers
    24

    Thu

  • PHX–STL, 09/25/2026: From $325
    25

    Fri

  • PHX–STL, 09/26/2026: From $291
    26

    Sat

  • PHX–STL, 09/27/2026: From $325
    27

    Sun

  • PHX–STL, 09/28/2026: From $325
    28

    Mon

  • PHX–STL, 09/29/2026: From $291
    29

    Tue

  • PHX–STL, 09/30/2026: From $199
    30

    Wed

  • PHX–STL, 10/01/2026: From $199
    01

    Thu

    OCT

  • PHX–STL, 10/02/2026: From $209
    02

    Fri

  • PHX–STL, 10/03/2026: From $199
    03

    Sat

  • PHX–STL, 10/04/2026: From $275
    04

    Sun

  • PHX–STL: cmp-view-offers-disclaimer. Find Offers
    05

    Mon

  • PHX–STL, 10/06/2026: From $199
    06

    Tue

  • PHX–STL, 10/07/2026: From $199
    07

    Wed

  • PHX–STL, 10/08/2026: From $199
    08

    Thu

  • PHX–STL, 10/09/2026: From $209
    09

    Fri

    • Range$199-$347

    *Fares displayed have been collected within the last 24 hours and may no longer be available at time of booking. Additional fees and charges for optional products and services may apply. Modifying this information may result in a different fare. To find the most updated fare, please visit Southwest.com. Fares listed are Basic, which are subject to additional terms and conditions.

    Flight Details

    Departing from:
    Sky Harbor International Airport
    Arriving at:
    Lambert-St Louis Int'l Airport
    Average flight time:
    2 hours 54 minutes
    Distance:
    1262 miles

    Route Information

    156† Weekly flights
    • 4‡ Nonstop flights per day Monday through Friday
    • 4‡ Nonstop flights on Saturday
    • 4‡ Nonstop flights on Sunday

    † Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.

    ‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.

    Questions we hear the most

    The average flight time from Phoenix to St. Louis is 2 hours 54 minutes.
    There are 156 weekly flights from Phoenix to St. Louis on Southwest Airlines.
    Yes, Southwest flies nonstop from Phoenix to St. Louis 4 times per day from Monday through Friday.
    Yes, Southwest flies nonstop from Phoenix to St. Louis 4 times per day on Saturdays and Sundays.
    To find the lowest fares by day and time to fly Phoenix to St. Louis with Southwest, check out our Low Fare Calendar.
    You can rent a car at Lambert-St Louis Int'l Airport book yours with your flight.
    Yes! Flights from Phoenix to St. Louis—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
    Check the status of your upcoming Southwest flight.
    Check out the Southwest Airlines® Help Center for answers about everything Southwest.

    Explore Flights from Other Popular Origins

    Popular Flights from Phoenix