Southwest® flights from Boston to St. Louis from $170

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Low fares from Boston to St. Louis

$

Boston (BOS)to

St. Louis (STL)
Depart: 12/15/2026

One-way

Basic

From
$170
Seen: 20 hrs ago

Boston (BOS)to

St. Louis (STL)
Depart: 01/27/2027

One-way

Basic

From
$170
Seen: 22 hrs ago

Boston (BOS)to

St. Louis (STL)
Depart: 12/09/2026

One-way

Basic

From
$175
Seen: 9 hrs ago

Boston (BOS)to

St. Louis (STL)
Depart: 12/02/2026

One-way

Basic

From
$175
Seen: 14 minutes ago

Boston (BOS)to

St. Louis (STL)
Depart: 12/29/2026

One-way

Basic

From
$175
Seen: 10 hrs ago

Boston (BOS)to

St. Louis (STL)
Depart: 12/08/2026

One-way

Basic

From
$175
Seen: 9 hrs ago

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Explore flights from Boston to St. Louis

Nov 2026
From$316*
Seen: 9 hrs ago
One Way/Basic
Dec 2026
From$170*
Seen: 20 hrs ago
One Way/Basic
Jan 2027
From$170*
Seen: 22 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $175
cmp-daily-histogram-bars-legend-max-price-aria-label $366
Displaying fares for November-2026
  • BOS–STL, 11/11/2026: From $316
    11

    Wed

    NOV

  • BOS–STL, 11/12/2026: From $365
    12

    Thu

  • BOS–STL, 11/13/2026: From $365
    13

    Fri

  • BOS–STL, 11/14/2026: From $316
    14

    Sat

  • BOS–STL, 11/15/2026: From $365
    15

    Sun

  • BOS–STL, 11/16/2026: From $365
    16

    Mon

  • BOS–STL, 11/17/2026: From $316
    17

    Tue

  • BOS–STL, 11/18/2026: From $316
    18

    Wed

  • BOS–STL, 11/19/2026: From $365
    19

    Thu

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

    Fri

  • BOS–STL, 11/21/2026: From $316
    21

    Sat

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

    Sun

  • BOS–STL: cmp-view-offers-disclaimer. Find Offers
    23

    Mon

  • BOS–STL, 11/24/2026: From $316
    24

    Tue

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

    Wed

  • BOS–STL, 11/26/2026: From $326
    26

    Thu

  • BOS–STL, 11/27/2026: From $326
    27

    Fri

  • BOS–STL: cmp-view-offers-disclaimer. Find Offers
    28

    Sat

  • BOS–STL, 11/29/2026: From $326
    29

    Sun

  • BOS–STL, 11/30/2026: From $366
    30

    Mon

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

    Tue

    DEC

  • BOS–STL, 12/02/2026: From $175
    02

    Wed

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

    Thu

  • BOS–STL, 12/04/2026: From $210
    04

    Fri

  • BOS–STL, 12/05/2026: From $185
    05

    Sat

  • BOS–STL, 12/06/2026: From $299
    06

    Sun

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

    Mon

  • BOS–STL, 12/08/2026: From $175
    08

    Tue

  • BOS–STL, 12/09/2026: From $175
    09

    Wed

  • BOS–STL, 12/10/2026: From $195
    10

    Thu

    • Range$175-$366

    *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:
    Logan International Airport
    Arriving at:
    Lambert-St Louis Int'l Airport
    Average flight time:
    3 hours 3 minutes
    Distance:
    1047 miles

    Questions we hear the most

    The average flight time from Boston to St. Louis is 3 hours 3 minutes.
    There are 149 weekly flights from Boston to St. Louis on Southwest Airlines.
    Yes, Southwest flies nonstop from Boston to St. Louis 3 times per day from Monday through Friday.
    Yes, Southwest flies nonstop from Boston to St. Louis 3 times per day on Saturdays and Sundays.
    To find the lowest fares by day and time to fly Boston 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 Boston 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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