Southwest® flights from Boston to St. Louis from $159

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Low fares from Boston to St. Louis

$

Boston (BOS)to

St. Louis (STL)
Depart: 12/10/2026

One-way

Basic

From
$159
Seen: 18 hrs ago

Boston (BOS)to

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

One-way

Basic

From
$159
Seen: 21 hrs ago

Boston (BOS)to

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

One-way

Basic

From
$159
Seen: 23 hrs ago

Boston (BOS)to

St. Louis (STL)
Depart: 10/29/2026

One-way

Basic

From
$159
Seen: 8 hrs ago

Boston (BOS)to

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

One-way

Basic

From
$159
Seen: 4 hrs ago

Boston (BOS)to

St. Louis (STL)
Depart: 12/17/2026

One-way

Basic

From
$159
Seen: 3 hrs ago

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Explore flights from Boston to St. Louis

Oct 2026
From$159*
Seen: 8 hrs ago
One Way/Basic
Nov 2026
From$159*
Seen: 10 hrs ago
One Way/Basic
Dec 2026
From$159*
Seen: 17 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $159
cmp-daily-histogram-bars-legend-max-price-aria-label $435
Displaying fares for October-2026
  • BOS–STL: cmp-view-offers-disclaimer. Find Offers
    01

    Thu

    OCT

  • BOS–STL, 10/02/2026: From $350
    02

    Fri

  • BOS–STL, 10/03/2026: From $301
    03

    Sat

  • BOS–STL, 10/04/2026: From $350
    04

    Sun

  • BOS–STL, 10/05/2026: From $350
    05

    Mon

  • BOS–STL, 10/06/2026: From $301
    06

    Tue

  • BOS–STL, 10/07/2026: From $301
    07

    Wed

  • BOS–STL, 10/08/2026: From $350
    08

    Thu

  • BOS–STL: cmp-view-offers-disclaimer. Find Offers
    09

    Fri

  • BOS–STL, 10/10/2026: From $334
    10

    Sat

  • BOS–STL, 10/11/2026: From $360
    11

    Sun

  • BOS–STL, 10/12/2026: From $384
    12

    Mon

  • BOS–STL, 10/13/2026: From $334
    13

    Tue

  • BOS–STL, 10/14/2026: From $301
    14

    Wed

  • BOS–STL, 10/15/2026: From $311
    15

    Thu

  • BOS–STL, 10/16/2026: From $321
    16

    Fri

  • BOS–STL, 10/17/2026: From $301
    17

    Sat

  • BOS–STL, 10/18/2026: From $435
    18

    Sun

  • BOS–STL, 10/19/2026: From $321
    19

    Mon

  • BOS–STL, 10/20/2026: From $301
    20

    Tue

  • BOS–STL, 10/21/2026: From $159
    21

    Wed

  • BOS–STL, 10/22/2026: From $159
    22

    Thu

  • BOS–STL, 10/23/2026: From $189
    23

    Fri

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

    Sat

  • BOS–STL, 10/25/2026: From $321
    25

    Sun

  • BOS–STL, 10/26/2026: From $199
    26

    Mon

  • BOS–STL, 10/27/2026: From $159
    27

    Tue

  • BOS–STL, 10/28/2026: From $159
    28

    Wed

  • BOS–STL, 10/29/2026: From $159
    29

    Thu

  • BOS–STL, 10/30/2026: From $189
    30

    Fri

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

    Sat

    • Range$159-$435

    *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

    Route Information

    149† Weekly flights
    • 3‡ Nonstop flights per day Monday through Friday
    • 3‡ Nonstop flights on Saturday
    • 3‡ Nonstop flights on Sunday

    † Weekly flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025. Note: route may not operate every day of the week.

    ‡ Nonstop flights based on DOT published scheduled average flights Monday through Sunday between 9/1/2025 and 9/30/2025.

    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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