Southwest® flights from Ontario/LA to San Antonio from $148

Promo Code

Low fares from Ontario/LA to San Antonio

$

Ontario/LA (ONT)to

San Antonio (SAT)
Depart: 12/09/2026

One-way

Basic

From
$148
Seen: 15 hrs ago

Ontario/LA (ONT)to

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

One-way

Basic

From
$148
Seen: 19 hrs ago

Ontario/LA (ONT)to

San Antonio (SAT)
Depart: 12/03/2026

One-way

Basic

From
$148
Seen: 5 hrs ago

Ontario/LA (ONT)to

San Antonio (SAT)
Depart: 11/17/2026

One-way

Basic

From
$148
Seen: 7 hrs ago

Ontario/LA (ONT)to

San Antonio (SAT)
Depart: 12/24/2026

One-way

Basic

From
$153
Seen: 15 hrs ago

Ontario/LA (ONT)to

San Antonio (SAT)
Depart: 01/28/2027

One-way

Basic

From
$153
Seen: 12 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 Ontario/LA to San Antonio

Oct 2026
From$469*
Seen: 17 hrs ago
One Way/Basic
Nov 2026
From$148*
Seen: 19 hrs ago
One Way/Basic
Dec 2026
From$148*
Seen: 5 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $148
cmp-daily-histogram-bars-legend-max-price-aria-label $549
Displaying fares for October-2026
  • ONT–SAT, 10/23/2026: From $549
    23

    Fri

    OCT

  • ONT–SAT, 10/24/2026: From $549
    24

    Sat

  • ONT–SAT, 10/25/2026: From $549
    25

    Sun

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

    Mon

  • ONT–SAT: cmp-view-offers-disclaimer. Find Offers
    27

    Tue

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

    Wed

  • ONT–SAT, 10/29/2026: From $469
    29

    Thu

  • ONT–SAT, 10/30/2026: From $469
    30

    Fri

  • ONT–SAT, 10/31/2026: From $469
    31

    Sat

  • ONT–SAT, 11/01/2026: From $469
    01

    Sun

    NOV

  • ONT–SAT, 11/02/2026: From $469
    02

    Mon

  • ONT–SAT, 11/03/2026: From $464
    03

    Tue

  • ONT–SAT, 11/04/2026: From $464
    04

    Wed

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

    Thu

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

    Fri

  • ONT–SAT, 11/07/2026: From $284
    07

    Sat

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

    Sun

  • ONT–SAT, 11/09/2026: From $189
    09

    Mon

  • ONT–SAT: cmp-view-offers-disclaimer. Find Offers
    10

    Tue

  • ONT–SAT, 11/11/2026: From $148
    11

    Wed

  • ONT–SAT, 11/12/2026: From $153
    12

    Thu

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

    Fri

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

    Sat

  • ONT–SAT, 11/15/2026: From $268
    15

    Sun

  • ONT–SAT: cmp-view-offers-disclaimer. Find Offers
    16

    Mon

  • ONT–SAT, 11/17/2026: From $148
    17

    Tue

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

    Wed

  • ONT–SAT, 11/19/2026: From $165
    19

    Thu

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

    Fri

  • ONT–SAT, 11/21/2026: From $244
    21

    Sat

  • ONT–SAT, 11/22/2026: From $161
    22

    Sun

    • Range$148-$549

    *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

    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.

    Explore Flights from Other Popular Origins

    Popular Flights from Ontario/LA