Flights from Chicago, IL to St. Louis, MO

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Best Deals on Flights From Chicago, IL (ORD) to St. Louis, MO (STL)

Sep 2026
from$199*
Last seen: 22 hours ago
One-way/Economy
Oct 2026
from$120*
Last seen: 9 hours ago
One-way/Economy
Nov 2026
from$144*
Last seen: 11 hours ago
One-way/Economy
cmp-daily-histogram-bars-legend-min-price-aria-label $120
Displaying fares for September-2026
  • ORD–STL: cmp-view-offers-disclaimer. Find Offers
    23

    Wed

    SEP

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

    Thu

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

    Fri

  • ORD–STL, Sep 26, 2026: from $199
    26

    Sat

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

    Sun

  • ORD–STL, Sep 28, 2026: from $205
    28

    Mon

  • ORD–STL: cmp-view-offers-disclaimer. Find Offers
    29

    Tue

  • ORD–STL: cmp-view-offers-disclaimer. Find Offers
    30

    Wed

  • ORD–STL: cmp-view-offers-disclaimer. Find Offers
    01

    Thu

    OCT

  • ORD–STL, Oct 2, 2026: from $199
    02

    Fri

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

    Sat

  • ORD–STL: cmp-view-offers-disclaimer. Find Offers
    04

    Sun

  • ORD–STL, Oct 5, 2026: from $199
    05

    Mon

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

    Tue

  • ORD–STL, Oct 7, 2026: from $184
    07

    Wed

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

    Thu

  • ORD–STL, Oct 9, 2026: from $184
    09

    Fri

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

    Sat

  • ORD–STL: cmp-view-offers-disclaimer. Find Offers
    11

    Sun

  • ORD–STL, Oct 12, 2026: from $184
    12

    Mon

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

    Tue

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

    Wed

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

    Thu

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

    Fri

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

    Sat

  • ORD–STL: cmp-view-offers-disclaimer. Find Offers
    18

    Sun

  • ORD–STL, Oct 19, 2026: from $120
    19

    Mon

  • ORD–STL: cmp-view-offers-disclaimer. Find Offers
    20

    Tue

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

    Wed

  • ORD–STL: cmp-view-offers-disclaimer. Find Offers
    22

    Thu

    • Range$120-$205

    *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 Chicago, IL to St. Louis, MO on Frontier

    $
    *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®.

    Chicago, IL St. Louis, MO

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