Southwest® flights from Seattle/Tacoma to San Antonio from $139

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Low fares from Seattle/Tacoma to San Antonio

$

Seattle/Tacoma (SEA)to

San Antonio (SAT)
Depart: 10/07/2026

One-way

Basic

From
$139
Seen: 11 hrs ago

Seattle/Tacoma (SEA)to

San Antonio (SAT)
Depart: 10/24/2026

One-way

Basic

From
$139
Seen: 21 hrs ago

Seattle/Tacoma (SEA)to

San Antonio (SAT)
Depart: 09/16/2026

One-way

Basic

From
$139
Seen: 22 hrs ago

Seattle/Tacoma (SEA)to

San Antonio (SAT)
Depart: 09/15/2026

One-way

Basic

From
$139
Seen: 1 hour ago

Seattle/Tacoma (SEA)to

San Antonio (SAT)
Depart: 09/10/2026

One-way

Basic

From
$139
Seen: 23 hrs ago

Seattle/Tacoma (SEA)to

San Antonio (SAT)
Depart: 10/20/2026

One-way

Basic

From
$139
Seen: 18 hrs ago

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Explore flights from Seattle/Tacoma to San Antonio

Aug 2026
From$190*
Seen: 23 hrs ago
One Way/Basic
Sep 2026
From$139*
Seen: 1 hour ago
One Way/Basic
Oct 2026
From$139*
Seen: 18 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $139
cmp-daily-histogram-bars-legend-max-price-aria-label $440
Displaying fares for August-2026
  • SEA–SAT, 08/22/2026: From $220
    22

    Sat

    AUG

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    23

    Sun

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    24

    Mon

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    25

    Tue

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    26

    Wed

  • SEA–SAT, 08/27/2026: From $220
    27

    Thu

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    28

    Fri

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    29

    Sat

  • SEA–SAT, 08/30/2026: From $219
    30

    Sun

  • SEA–SAT, 08/31/2026: From $190
    31

    Mon

  • SEA–SAT, 09/01/2026: From $169
    01

    Tue

    SEP

  • SEA–SAT, 09/02/2026: From $164
    02

    Wed

  • SEA–SAT, 09/03/2026: From $174
    03

    Thu

  • SEA–SAT, 09/04/2026: From $139
    04

    Fri

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    05

    Sat

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    06

    Sun

  • SEA–SAT, 09/07/2026: From $440
    07

    Mon

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    08

    Tue

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    09

    Wed

  • SEA–SAT, 09/10/2026: From $139
    10

    Thu

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    11

    Fri

  • SEA–SAT, 09/12/2026: From $144
    12

    Sat

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    13

    Sun

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    14

    Mon

  • SEA–SAT, 09/15/2026: From $139
    15

    Tue

  • SEA–SAT, 09/16/2026: From $139
    16

    Wed

  • SEA–SAT, 09/17/2026: From $144
    17

    Thu

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    18

    Fri

  • SEA–SAT, 09/19/2026: From $158
    19

    Sat

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    20

    Sun

  • SEA–SAT: cmp-view-offers-disclaimer. Find Offers
    21

    Mon

    • Range$139-$440

    *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:
    Seattle/Tacoma International Airport
    Arriving at:
    San Antonio International Airport
    Distance:
    1774 miles

    Route Information

    119† 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 119 weekly flights from Seattle/Tacoma to San Antonio on Southwest Airlines.
    To find the lowest fares by day and time to fly Seattle/Tacoma to San Antonio with Southwest, check out our Low Fare Calendar.
    You can rent a car at San Antonio International Airport book yours with your flight.
    Yes! Flights from Seattle/Tacoma to San Antonio—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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