Flights from Denver, CO to St. Louis, MO

Promo Code

Best Deals on Flights From Denver, CO (DEN) to St. Louis, MO (STL)

Oct 2026
from$179*
Last seen: 13 hours ago
One-way/Economy
Nov 2026
from$39*
Last seen: 1 min ago
One-way/Economy
Dec 2026
from$39*
Last seen: 12 hours ago
One-way/Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $39
cmp-daily-histogram-bars-legend-max-price-aria-label $214
Displaying fares for October-2026
  • DEN–STL: cmp-view-offers-disclaimer. Find Offers
    24

    Sat

    OCT

  • DEN–STL: cmp-view-offers-disclaimer. Find Offers
    25

    Sun

  • DEN–STL, Oct 26, 2026: from $214
    26

    Mon

  • DEN–STL: cmp-view-offers-disclaimer. Find Offers
    27

    Tue

  • DEN–STL, Oct 28, 2026: from $214
    28

    Wed

  • DEN–STL, Oct 29, 2026: from $214
    29

    Thu

  • DEN–STL, Oct 30, 2026: from $179
    30

    Fri

  • DEN–STL: cmp-view-offers-disclaimer. Find Offers
    31

    Sat

  • DEN–STL, Nov 1, 2026: from $179
    01

    Sun

    NOV

  • DEN–STL, Nov 2, 2026: from $179
    02

    Mon

  • DEN–STL: cmp-view-offers-disclaimer. Find Offers
    03

    Tue

  • DEN–STL, Nov 4, 2026: from $139
    04

    Wed

  • DEN–STL, Nov 5, 2026: from $179
    05

    Thu

  • DEN–STL, Nov 6, 2026: from $159
    06

    Fri

  • DEN–STL: cmp-view-offers-disclaimer. Find Offers
    07

    Sat

  • DEN–STL: cmp-view-offers-disclaimer. Find Offers
    08

    Sun

  • DEN–STL, Nov 9, 2026: from $50
    09

    Mon

  • DEN–STL: cmp-view-offers-disclaimer. Find Offers
    10

    Tue

  • DEN–STL, Nov 11, 2026: from $71
    11

    Wed

  • DEN–STL, Nov 12, 2026: from $107
    12

    Thu

  • DEN–STL, Nov 13, 2026: from $39
    13

    Fri

  • DEN–STL, Nov 14, 2026: from $50
    14

    Sat

  • DEN–STL: cmp-view-offers-disclaimer. Find Offers
    15

    Sun

  • DEN–STL: cmp-view-offers-disclaimer. Find Offers
    16

    Mon

  • DEN–STL: cmp-view-offers-disclaimer. Find Offers
    17

    Tue

  • DEN–STL, Nov 18, 2026: from $50
    18

    Wed

  • DEN–STL, Nov 19, 2026: from $50
    19

    Thu

  • DEN–STL, Nov 20, 2026: from $103
    20

    Fri

  • DEN–STL: cmp-view-offers-disclaimer. Find Offers
    21

    Sat

  • DEN–STL, Nov 22, 2026: from $132
    22

    Sun

  • DEN–STL, Nov 23, 2026: from $53
    23

    Mon

    • Range$39-$214

    *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 Denver, CO to St. Louis, MO on Frontier

    $
    Flights Deals from Denver, CO to St. Louis, MO on Frontier
    From
    To
    Denver, CO (DEN)St. Louis, MO (STL)One-way
    /
    Discount Den Basic Fare    		Departing Jan 22, 2027

    From

    $50

    Last seen: 14 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®.

    Denver, CO St. Louis, MO

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