Flights from Phoenix, AZ to St. Louis, MO

Promo Code

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

Jun 2026
from$137*
Last seen: 11 hours ago
One-way/Economy
Jul 2026
from$51*
Last seen: 5 hours ago
One-way/Economy
Aug 2026
from$93*
Last seen: 5 hours ago
One-way/Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $53
cmp-daily-histogram-bars-legend-max-price-aria-label $177
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    • Range$53-$177

    *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 Phoenix, AZ to St. Louis, MO on Frontier

    $
    Flights Deals from Phoenix, AZ to St. Louis, MO on Frontier
    From
    To
    Phoenix, AZ (PHX)St. Louis, MO (STL)One-way
    /
    Discount Den Basic Fare    		Departing Sep 11, 2026

    From

    $143

    Last seen: 19 hours 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®.

    Phoenix, AZ St. Louis, MO

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