Southwest® flights from Boise to St. Louis from $122

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Low fares from Boise to St. Louis

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Boise (BOI)to

St. Louis (STL)
Depart: 11/10/2026

One-way

Basic

From
$122
Seen: 4 hrs ago

Boise (BOI)to

St. Louis (STL)
Depart: 12/12/2026

One-way

Basic

From
$127
Seen: 18 hrs ago

Boise (BOI)to

St. Louis (STL)
Depart: 12/03/2026

One-way

Basic

From
$127
Seen: 9 hrs ago

Boise (BOI)to

St. Louis (STL)
Depart: 11/18/2026

One-way

Basic

From
$127
Seen: 16 hrs ago

Boise (BOI)to

St. Louis (STL)
Depart: 12/07/2026

One-way

Basic

From
$127
Seen: 9 hrs ago

Boise (BOI)to

St. Louis (STL)
Depart: 11/09/2026

One-way

Basic

From
$127
Seen: 5 hrs ago

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Explore flights from Boise to St. Louis

Oct 2026
From$265*
Seen: 7 hrs ago
One Way/Basic
Nov 2026
From$122*
Seen: 4 hrs ago
One Way/Basic
Dec 2026
From$127*
Seen: 9 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $122
cmp-daily-histogram-bars-legend-max-price-aria-label $413
Displaying fares for October-2026
  • BOI–STL, 10/21/2026: From $368
    21

    Wed

    OCT

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

    Thu

  • BOI–STL, 10/23/2026: From $363
    23

    Fri

  • BOI–STL, 10/24/2026: From $363
    24

    Sat

  • BOI–STL, 10/25/2026: From $413
    25

    Sun

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    26

    Mon

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

    Tue

  • BOI–STL, 10/28/2026: From $265
    28

    Wed

  • BOI–STL, 10/29/2026: From $345
    29

    Thu

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    30

    Fri

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

    Sat

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

    Sun

    NOV

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    02

    Mon

  • BOI–STL, 11/03/2026: From $250
    03

    Tue

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    04

    Wed

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    05

    Thu

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    06

    Fri

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    07

    Sat

  • BOI–STL, 11/08/2026: From $324
    08

    Sun

  • BOI–STL, 11/09/2026: From $127
    09

    Mon

  • BOI–STL, 11/10/2026: From $122
    10

    Tue

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

    Wed

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    12

    Thu

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    13

    Fri

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

    Sat

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

    Sun

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

    Mon

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

    Tue

  • BOI–STL, 11/18/2026: From $127
    18

    Wed

  • BOI–STL, 11/19/2026: From $279
    19

    Thu

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    20

    Fri

    • Range$122-$413

    *Fares displayed have been collected within the last 24 hours and may no longer be available at time of booking. Additional fees and charges for optional products and services may apply. Modifying this information may result in a different fare. To find the most updated fare, please visit Southwest.com. Fares listed are Basic, which are subject to additional terms and conditions.

    Flight Details

    Departing from:
    Boise Airport
    Arriving at:
    Lambert-St Louis Int'l Airport
    Distance:
    1383 miles

    Questions we hear the most

    There are 118 weekly flights from Boise to St. Louis on Southwest Airlines.
    To find the lowest fares by day and time to fly Boise to St. Louis with Southwest, check out our Low Fare Calendar.
    You can rent a car at Lambert-St Louis Int'l Airport book yours with your flight.
    Yes! Flights from Boise to St. Louis—or from here or there to anywhere—can be changed with no change fees. Fare difference may apply.
    Check the status of your upcoming Southwest flight.
    Check out the Southwest Airlines® Help Center for answers about everything Southwest.

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