Flights from St. Louis, MO to Phoenix, AZ

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Best Deals on Flights From St. Louis, MO (STL) to Phoenix, AZ (PHX)

Jun 2026
from$143*
Last seen: 9 hours ago
One-way/Economy
Jul 2026
from$56*
Last seen: 22 hours ago
One-way/Economy
Aug 2026
from$46*
Last seen: 4 hours ago
One-way/Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $56
cmp-daily-histogram-bars-legend-max-price-aria-label $171
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    • Range$56-$171

    *Prices found by others in the previous 48 hours for round-trip flights. Prices shown may also require membership in our travel club, Discount Den.

    Flights Deals from St. Louis, MO to Phoenix, AZ on Frontier

    $
    Flights Deals from St. Louis, MO to Phoenix, AZ on Frontier
    From
    To
    St. Louis, MO (STL)Phoenix, AZ (PHX)One-way
    /
    Discount Den Basic Fare    		Departing Sep 15, 2026

    From

    $86

    Last seen: 1 hour ago

    *Prices found by others in the previous 48 hours for one-way flights. Prices shown may also require membership in our travel club, Discount Den®.

    St. Louis, MO Phoenix, AZ

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