Southwest® flights from Ontario/LA to San Francisco from $89

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Low fares from Ontario/LA to San Francisco

$

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 10/30/2026

One-way

Basic

From
$89
Seen: 4 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 09/06/2026

One-way

Basic

From
$89
Seen: 6 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 09/19/2026

One-way

Basic

From
$94
Seen: 9 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 09/15/2026

One-way

Basic

From
$94
Seen: 20 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 09/26/2026

One-way

Basic

From
$94
Seen: 15 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 09/23/2026

One-way

Basic

From
$94
Seen: 12 hrs ago

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Explore flights from Ontario/LA to San Francisco

Aug 2026
From$112*
Seen: 3 hrs ago
One Way/Basic
Sep 2026
From$89*
Seen: 6 hrs ago
One Way/Basic
Oct 2026
From$89*
Seen: 4 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $89
cmp-daily-histogram-bars-legend-max-price-aria-label $402
Displaying fares for August-2026
  • ONT–SFO, 08/14/2026: From $402
    14

    Fri

    AUG

  • ONT–SFO, 08/15/2026: From $398
    15

    Sat

  • ONT–SFO, 08/16/2026: From $402
    16

    Sun

  • ONT–SFO, 08/17/2026: From $402
    17

    Mon

  • ONT–SFO, 08/18/2026: From $398
    18

    Tue

  • ONT–SFO, 08/19/2026: From $292
    19

    Wed

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

    Thu

  • ONT–SFO, 08/21/2026: From $292
    21

    Fri

  • ONT–SFO, 08/22/2026: From $292
    22

    Sat

  • ONT–SFO, 08/23/2026: From $292
    23

    Sun

  • ONT–SFO, 08/24/2026: From $292
    24

    Mon

  • ONT–SFO, 08/25/2026: From $292
    25

    Tue

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

    Wed

  • ONT–SFO, 08/27/2026: From $210
    27

    Thu

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

    Fri

  • ONT–SFO, 08/29/2026: From $210
    29

    Sat

  • ONT–SFO: cmp-view-offers-disclaimer. Find Offers
    30

    Sun

  • ONT–SFO, 08/31/2026: From $112
    31

    Mon

  • ONT–SFO: cmp-view-offers-disclaimer. Find Offers
    01

    Tue

    SEP

  • ONT–SFO, 09/02/2026: From $94
    02

    Wed

  • ONT–SFO, 09/03/2026: From $175
    03

    Thu

  • ONT–SFO, 09/04/2026: From $210
    04

    Fri

  • ONT–SFO, 09/05/2026: From $120
    05

    Sat

  • ONT–SFO, 09/06/2026: From $89
    06

    Sun

  • ONT–SFO, 09/07/2026: From $254
    07

    Mon

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

    Tue

  • ONT–SFO, 09/09/2026: From $94
    09

    Wed

  • ONT–SFO, 09/10/2026: From $112
    10

    Thu

  • ONT–SFO, 09/11/2026: From $94
    11

    Fri

  • ONT–SFO, 09/12/2026: From $94
    12

    Sat

  • ONT–SFO, 09/13/2026: From $170
    13

    Sun

    • Range$89-$402

    *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 Francisco International Airport
    Distance:
    363 miles

    Route Information

    92† 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 92 weekly flights from Ontario/LA to San Francisco on Southwest Airlines.
    To find the lowest fares by day and time to fly Ontario/LA to San Francisco with Southwest, check out our Low Fare Calendar.
    You can rent a car at San Francisco International Airport book yours with your flight.
    Yes! Flights from Ontario/LA to San Francisco—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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