Southwest® flights from St. Louis to Boston from $149

Promo Code

Low fares from St. Louis to Boston

$

St. Louis (STL)to

Boston (BOS)
Depart: 10/07/2026

One-way

Basic

From
$149
Seen: 18 hrs ago

St. Louis (STL)to

Boston (BOS)
Depart: 09/29/2026

One-way

Basic

From
$149
Seen: 21 hrs ago

St. Louis (STL)to

Boston (BOS)
Depart: 10/17/2026

One-way

Basic

From
$149
Seen: 19 hrs ago

St. Louis (STL)to

Boston (BOS)
Depart: 10/21/2026

One-way

Basic

From
$149
Seen: 20 hrs ago

St. Louis (STL)to

Boston (BOS)
Depart: 09/16/2026

One-way

Basic

From
$149
Seen: 22 hrs ago

St. Louis (STL)to

Boston (BOS)
Depart: 09/12/2026

One-way

Basic

From
$149
Seen: 22 hrs ago

Looking for more low-fare flights?

Check out the Low Fare Calendar to find a fare that works for you. Just choose the month you want to depart and return, and we’ll show you the best fares available.

Find low fares

Explore flights from St. Louis to Boston

Aug 2026
From$267*
Seen: 22 hrs ago
One Way/Basic
Sep 2026
From$149*
Seen: 19 hrs ago
One Way/Basic
Oct 2026
From$149*
Seen: 5 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $149
cmp-daily-histogram-bars-legend-max-price-aria-label $340
Displaying fares for August-2026
  • STL–BOS, 08/22/2026: From $277
    22

    Sat

    AUG

  • STL–BOS, 08/23/2026: From $330
    23

    Sun

  • STL–BOS, 08/24/2026: From $267
    24

    Mon

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

    Tue

  • STL–BOS, 08/26/2026: From $277
    26

    Wed

  • STL–BOS, 08/27/2026: From $267
    27

    Thu

  • STL–BOS, 08/28/2026: From $267
    28

    Fri

  • STL–BOS, 08/29/2026: From $267
    29

    Sat

  • STL–BOS, 08/30/2026: From $330
    30

    Sun

  • STL–BOS, 08/31/2026: From $267
    31

    Mon

  • STL–BOS, 09/01/2026: From $267
    01

    Tue

    SEP

  • STL–BOS, 09/02/2026: From $267
    02

    Wed

  • STL–BOS, 09/03/2026: From $267
    03

    Thu

  • STL–BOS, 09/04/2026: From $340
    04

    Fri

  • STL–BOS, 09/05/2026: From $236
    05

    Sat

  • STL–BOS, 09/06/2026: From $266
    06

    Sun

  • STL–BOS, 09/07/2026: From $267
    07

    Mon

  • STL–BOS, 09/08/2026: From $267
    08

    Tue

  • STL–BOS, 09/09/2026: From $221
    09

    Wed

  • STL–BOS, 09/10/2026: From $221
    10

    Thu

  • STL–BOS, 09/11/2026: From $169
    11

    Fri

  • STL–BOS, 09/12/2026: From $149
    12

    Sat

  • STL–BOS, 09/13/2026: From $264
    13

    Sun

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

    Mon

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

    Tue

  • STL–BOS, 09/16/2026: From $149
    16

    Wed

  • STL–BOS, 09/17/2026: From $169
    17

    Thu

  • STL–BOS, 09/18/2026: From $169
    18

    Fri

  • STL–BOS, 09/19/2026: From $149
    19

    Sat

  • STL–BOS, 09/20/2026: From $236
    20

    Sun

  • STL–BOS, 09/21/2026: From $149
    21

    Mon

    • Range$149-$340

    *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.

    Explore Flights from Other Popular Origins

    Popular Flights from St. Louis