Southwest® flights from Ontario/LA to San Francisco from $76

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Low fares from Ontario/LA to San Francisco

$

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 12/03/2026

One-way

Basic

From
$76
Seen: 15 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 11/05/2026

One-way

Basic

From
$76
Seen: 8 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 10/01/2026

One-way

Basic

From
$76
Seen: 17 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 11/07/2026

One-way

Basic

From
$76
Seen: 8 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 10/17/2026

One-way

Basic

From
$76
Seen: 10 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 10/24/2026

One-way

Basic

From
$76
Seen: 9 hrs ago

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Explore flights from Ontario/LA to San Francisco

Sep 2026
From$76*
Seen: 20 minutes ago
One Way/Basic
Oct 2026
From$76*
Seen: 4 hrs ago
One Way/Basic
Nov 2026
From$76*
Seen: 8 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $76
cmp-daily-histogram-bars-legend-max-price-aria-label $412
Displaying fares for September-2026
  • ONT–SFO, 09/03/2026: From $412
    03

    Thu

    SEP

  • ONT–SFO, 09/04/2026: From $412
    04

    Fri

  • ONT–SFO, 09/05/2026: From $408
    05

    Sat

  • ONT–SFO, 09/06/2026: From $412
    06

    Sun

  • ONT–SFO, 09/07/2026: From $412
    07

    Mon

  • ONT–SFO, 09/08/2026: From $408
    08

    Tue

  • ONT–SFO, 09/09/2026: From $139
    09

    Wed

  • ONT–SFO, 09/10/2026: From $139
    10

    Thu

  • ONT–SFO, 09/11/2026: From $302
    11

    Fri

  • ONT–SFO, 09/12/2026: From $139
    12

    Sat

  • ONT–SFO, 09/13/2026: From $139
    13

    Sun

  • ONT–SFO, 09/14/2026: From $139
    14

    Mon

  • ONT–SFO, 09/15/2026: From $139
    15

    Tue

  • ONT–SFO, 09/16/2026: From $139
    16

    Wed

  • ONT–SFO, 09/17/2026: From $139
    17

    Thu

  • ONT–SFO, 09/18/2026: From $139
    18

    Fri

  • ONT–SFO, 09/19/2026: From $139
    19

    Sat

  • ONT–SFO, 09/20/2026: From $220
    20

    Sun

  • ONT–SFO, 09/21/2026: From $139
    21

    Mon

  • ONT–SFO, 09/22/2026: From $139
    22

    Tue

  • ONT–SFO: cmp-view-offers-disclaimer. Find Offers
    23

    Wed

  • ONT–SFO, 09/24/2026: From $76
    24

    Thu

  • ONT–SFO, 09/25/2026: From $174
    25

    Fri

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

    Sat

  • ONT–SFO, 09/27/2026: From $180
    27

    Sun

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

    Mon

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

    Tue

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

    Wed

  • ONT–SFO, 10/01/2026: From $76
    01

    Thu

    OCT

  • ONT–SFO, 10/02/2026: From $86
    02

    Fri

    • Range$76-$412

    *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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