Southwest® flights from Ontario/LA to San Antonio from $178

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Low fares from Ontario/LA to San Antonio

$

Ontario/LA (ONT)to

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

One-way

Basic

From
$178
Seen: 23 hrs ago

Ontario/LA (ONT)to

San Antonio (SAT)
Depart: 11/16/2026

One-way

Basic

From
$211
Seen: 7 hrs ago

Ontario/LA (ONT)to

San Antonio (SAT)
Depart: 11/14/2026

One-way

Basic

From
$211
Seen: 4 hrs ago

Ontario/LA (ONT)to

San Antonio (SAT)
Depart: 11/18/2026

One-way

Basic

From
$211
Seen: 7 hrs ago

Ontario/LA (ONT)to

San Antonio (SAT)
Depart: 11/10/2026

One-way

Basic

From
$211
Seen: 39 minutes ago

Ontario/LA (ONT)to

San Antonio (SAT)
Depart: 12/14/2026

One-way

Basic

From
$211
Seen: 21 hrs ago

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Explore flights from Ontario/LA to San Antonio

Sep 2026
From$279*
Seen: 11 hrs ago
One Way/Basic
Oct 2026
From$178*
Seen: 23 hrs ago
One Way/Basic
Nov 2026
From$211*
Seen: 7 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $178
cmp-daily-histogram-bars-legend-max-price-aria-label $539
Displaying fares for September-2026
  • ONT–SAT, 09/12/2026: From $539
    12

    Sat

    SEP

  • ONT–SAT, 09/13/2026: From $539
    13

    Sun

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

    Mon

  • ONT–SAT: cmp-view-offers-disclaimer. Find Offers
    15

    Tue

  • ONT–SAT, 09/16/2026: From $539
    16

    Wed

  • ONT–SAT, 09/17/2026: From $539
    17

    Thu

  • ONT–SAT, 09/18/2026: From $459
    18

    Fri

  • ONT–SAT, 09/19/2026: From $459
    19

    Sat

  • ONT–SAT, 09/20/2026: From $459
    20

    Sun

  • ONT–SAT, 09/21/2026: From $459
    21

    Mon

  • ONT–SAT, 09/22/2026: From $459
    22

    Tue

  • ONT–SAT, 09/23/2026: From $459
    23

    Wed

  • ONT–SAT, 09/24/2026: From $459
    24

    Thu

  • ONT–SAT, 09/25/2026: From $289
    25

    Fri

  • ONT–SAT, 09/26/2026: From $279
    26

    Sat

  • ONT–SAT, 09/27/2026: From $279
    27

    Sun

  • ONT–SAT, 09/28/2026: From $279
    28

    Mon

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

    Tue

  • ONT–SAT, 09/30/2026: From $279
    30

    Wed

  • ONT–SAT, 10/01/2026: From $279
    01

    Thu

    OCT

  • ONT–SAT, 10/02/2026: From $279
    02

    Fri

  • ONT–SAT, 10/03/2026: From $216
    03

    Sat

  • ONT–SAT: cmp-view-offers-disclaimer. Find Offers
    04

    Sun

  • ONT–SAT, 10/05/2026: From $216
    05

    Mon

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

    Tue

  • ONT–SAT, 10/07/2026: From $178
    07

    Wed

  • ONT–SAT, 10/08/2026: From $216
    08

    Thu

  • ONT–SAT, 10/09/2026: From $216
    09

    Fri

  • ONT–SAT, 10/10/2026: From $216
    10

    Sat

  • ONT–SAT, 10/11/2026: From $239
    11

    Sun

    • Range$178-$539

    *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:
    LA/Ontario International Airport
    Arriving at:
    San Antonio International Airport
    Distance:
    1166 miles

    Route Information

    139† 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 139 weekly flights from Ontario/LA to San Antonio on Southwest Airlines.
    To find the lowest fares by day and time to fly Ontario/LA 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 Ontario/LA 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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