Flights from St. Louis, MO to Denver, CO

Promo Code

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

Sep 2026
from$155*
Last seen: 11 hours ago
One-way/Economy
Oct 2026
from$29*
Last seen: 2 hours ago
One-way/Economy
Nov 2026
from$29*
Last seen: 9 hours ago
One-way/Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $29
cmp-daily-histogram-bars-legend-max-price-aria-label $193
Displaying fares for September-2026
  • STL–DEN: cmp-view-offers-disclaimer. Find Offers
    13

    Sun

    SEP

  • STL–DEN: cmp-view-offers-disclaimer. Find Offers
    14

    Mon

  • STL–DEN, Sep 15, 2026: from $189
    15

    Tue

  • STL–DEN, Sep 16, 2026: from $189
    16

    Wed

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

    Thu

  • STL–DEN, Sep 18, 2026: from $189
    18

    Fri

  • STL–DEN, Sep 19, 2026: from $189
    19

    Sat

  • STL–DEN, Sep 20, 2026: from $179
    20

    Sun

  • STL–DEN, Sep 21, 2026: from $179
    21

    Mon

  • STL–DEN, Sep 22, 2026: from $179
    22

    Tue

  • STL–DEN, Sep 23, 2026: from $179
    23

    Wed

  • STL–DEN, Sep 24, 2026: from $179
    24

    Thu

  • STL–DEN, Sep 25, 2026: from $163
    25

    Fri

  • STL–DEN, Sep 26, 2026: from $193
    26

    Sat

  • STL–DEN, Sep 27, 2026: from $155
    27

    Sun

  • STL–DEN, Sep 28, 2026: from $155
    28

    Mon

  • STL–DEN, Sep 29, 2026: from $155
    29

    Tue

  • STL–DEN, Sep 30, 2026: from $155
    30

    Wed

  • STL–DEN, Oct 1, 2026: from $155
    01

    Thu

    OCT

  • STL–DEN, Oct 2, 2026: from $155
    02

    Fri

  • STL–DEN, Oct 3, 2026: from $43
    03

    Sat

  • STL–DEN, Oct 4, 2026: from $155
    04

    Sun

  • STL–DEN, Oct 5, 2026: from $29
    05

    Mon

  • STL–DEN: cmp-view-offers-disclaimer. Find Offers
    06

    Tue

  • STL–DEN, Oct 7, 2026: from $76
    07

    Wed

  • STL–DEN, Oct 8, 2026: from $138
    08

    Thu

  • STL–DEN, Oct 9, 2026: from $134
    09

    Fri

  • STL–DEN, Oct 10, 2026: from $93
    10

    Sat

  • STL–DEN, Oct 11, 2026: from $155
    11

    Sun

  • STL–DEN, Oct 12, 2026: from $93
    12

    Mon

    • Range$29-$193

    *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 Denver, CO on Frontier

    $
    Flights Deals from St. Louis, MO to Denver, CO on Frontier
    From
    To
    St. Louis, MO (STL)Denver, CO (DEN)One-way
    /
    Discount Den Basic Fare    		Departing Dec 14, 2026

    From

    $56

    Last seen: 8 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®.

    St. Louis, MO Denver, CO

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