Southwest® flights from Boston to San Diego from $99

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Low fares from Boston to San Diego

$

Boston (BOS)to

San Diego (SAN)
Depart: 09/09/2026

One-way

Basic

From
$99
Seen: 2 hrs ago

Boston (BOS)to

San Diego (SAN)
Depart: 10/03/2026

One-way

Basic

From
$99
Seen: 16 hrs ago

Boston (BOS)to

San Diego (SAN)
Depart: 09/16/2026

One-way

Basic

From
$99
Seen: 17 hrs ago

Boston (BOS)to

San Diego (SAN)
Depart: 11/03/2026

One-way

Basic

From
$99
Seen: 22 hrs ago

Boston (BOS)to

San Diego (SAN)
Depart: 09/01/2026

One-way

Basic

From
$99
Seen: 1 hour ago

Boston (BOS)to

San Diego (SAN)
Depart: 09/22/2026

One-way

Basic

From
$99
Seen: 2 hrs ago

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Explore flights from Boston to San Diego

Aug 2026
From$109*
Seen: 32 minutes ago
One Way/Basic
Sep 2026
From$99*
Seen: 17 hrs ago
One Way/Basic
Oct 2026
From$99*
Seen: 16 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $99
cmp-daily-histogram-bars-legend-max-price-aria-label $511
Displaying fares for August-2026
  • BOS–SAN: cmp-view-offers-disclaimer. Find Offers
    02

    Sun

    AUG

  • BOS–SAN, 08/03/2026: From $391
    03

    Mon

  • BOS–SAN, 08/04/2026: From $391
    04

    Tue

  • BOS–SAN, 08/05/2026: From $401
    05

    Wed

  • BOS–SAN, 08/06/2026: From $440
    06

    Thu

  • BOS–SAN, 08/07/2026: From $440
    07

    Fri

  • BOS–SAN: cmp-view-offers-disclaimer. Find Offers
    08

    Sat

  • BOS–SAN, 08/09/2026: From $511
    09

    Sun

  • BOS–SAN, 08/10/2026: From $341
    10

    Mon

  • BOS–SAN, 08/11/2026: From $296
    11

    Tue

  • BOS–SAN, 08/12/2026: From $296
    12

    Wed

  • BOS–SAN, 08/13/2026: From $296
    13

    Thu

  • BOS–SAN, 08/14/2026: From $209
    14

    Fri

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

    Sat

  • BOS–SAN, 08/16/2026: From $279
    16

    Sun

  • BOS–SAN, 08/17/2026: From $209
    17

    Mon

  • BOS–SAN, 08/18/2026: From $199
    18

    Tue

  • BOS–SAN: cmp-view-offers-disclaimer. Find Offers
    19

    Wed

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

    Thu

  • BOS–SAN, 08/21/2026: From $149
    21

    Fri

  • BOS–SAN, 08/22/2026: From $152
    22

    Sat

  • BOS–SAN, 08/23/2026: From $189
    23

    Sun

  • BOS–SAN, 08/24/2026: From $159
    24

    Mon

  • BOS–SAN, 08/25/2026: From $152
    25

    Tue

  • BOS–SAN, 08/26/2026: From $109
    26

    Wed

  • BOS–SAN, 08/27/2026: From $109
    27

    Thu

  • BOS–SAN, 08/28/2026: From $109
    28

    Fri

  • BOS–SAN, 08/29/2026: From $109
    29

    Sat

  • BOS–SAN, 08/30/2026: From $183
    30

    Sun

  • BOS–SAN, 08/31/2026: From $119
    31

    Mon

  • BOS–SAN, 09/01/2026: From $99
    01

    Tue

    SEP

    • Range$99-$511

    *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:
    San Diego International Airport
    Distance:
    2588 miles

    Route Information

    148† Weekly flights

    † 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

    There are 148 weekly flights from Boston to San Diego on Southwest Airlines.
    To find the lowest fares by day and time to fly Boston to San Diego with Southwest, check out our Low Fare Calendar.
    You can rent a car at San Diego International Airport book yours with your flight.
    Yes! Flights from Boston to San Diego—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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