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

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Low fares from St. Louis to Boston

$

St. Louis (STL)to

Boston (BOS)
Depart: 12/16/2026

One-way

Basic

From
$159
Seen: 23 hrs ago

St. Louis (STL)to

Boston (BOS)
Depart: 12/22/2026

One-way

Basic

From
$159
Seen: 23 hrs ago

St. Louis (STL)to

Boston (BOS)
Depart: 11/05/2026

One-way

Basic

From
$159
Seen: 15 hrs ago

St. Louis (STL)to

Boston (BOS)
Depart: 11/12/2026

One-way

Basic

From
$159
Seen: 11 hrs ago

St. Louis (STL)to

Boston (BOS)
Depart: 12/01/2026

One-way

Basic

From
$159
Seen: 14 hrs ago

St. Louis (STL)to

Boston (BOS)
Depart: 12/07/2026

One-way

Basic

From
$159
Seen: 19 hrs ago

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Explore flights from St. Louis to Boston

Oct 2026
From$159*
Seen: 4 hrs ago
One Way/Basic
Nov 2026
From$159*
Seen: 23 hrs ago
One Way/Basic
Dec 2026
From$159*
Seen: 13 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $159
cmp-daily-histogram-bars-legend-max-price-aria-label $374
Displaying fares for October-2026
  • STL–BOS, 10/01/2026: From $350
    01

    Thu

    OCT

  • STL–BOS, 10/02/2026: From $360
    02

    Fri

  • STL–BOS, 10/03/2026: From $311
    03

    Sat

  • STL–BOS, 10/04/2026: From $374
    04

    Sun

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

    Mon

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

    Tue

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

    Wed

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

    Thu

  • STL–BOS, 10/09/2026: From $374
    09

    Fri

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

    Sat

  • STL–BOS, 10/11/2026: From $350
    11

    Sun

  • STL–BOS: cmp-view-offers-disclaimer. Find Offers
    12

    Mon

  • STL–BOS, 10/13/2026: From $301
    13

    Tue

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

    Wed

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

    Thu

  • STL–BOS, 10/16/2026: From $311
    16

    Fri

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

    Sat

  • STL–BOS, 10/18/2026: From $311
    18

    Sun

  • STL–BOS, 10/19/2026: From $311
    19

    Mon

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

    Tue

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

    Wed

  • STL–BOS, 10/22/2026: From $278
    22

    Thu

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

    Fri

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

    Sat

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

    Sun

  • STL–BOS, 10/26/2026: From $159
    26

    Mon

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

    Tue

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

    Wed

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

    Thu

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

    Fri

  • STL–BOS, 10/31/2026: From $159
    31

    Sat

    • Range$159-$374

    *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:
    Lambert-St Louis Int'l Airport
    Arriving at:
    Logan International Airport
    Average flight time:
    2 hours 33 minutes
    Distance:
    1047 miles

    Route Information

    148† 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 St. Louis to Boston is 2 hours 33 minutes.
    There are 148 weekly flights from St. Louis to Boston on Southwest Airlines.
    Yes, Southwest flies nonstop from St. Louis to Boston 3 times per day from Monday through Friday.
    Yes, Southwest flies nonstop from St. Louis to Boston 3 times per day on Saturdays and Sundays.
    To find the lowest fares by day and time to fly St. Louis to Boston with Southwest, check out our Low Fare Calendar.
    You can rent a car at Logan International Airport book yours with your flight.
    Yes! Flights from St. Louis to Boston—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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