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: 10/20/2026

One-way

Basic

From
$76
Seen: 9 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 12/09/2026

One-way

Basic

From
$76
Seen: 5 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 10/29/2026

One-way

Basic

From
$76
Seen: 8 hrs ago

Ontario/LA (ONT)to

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

One-way

Basic

From
$76
Seen: 20 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 11/03/2026

One-way

Basic

From
$76
Seen: 11 hrs ago

Ontario/LA (ONT)to

San Francisco (SFO)
Depart: 12/10/2026

One-way

Basic

From
$76
Seen: 1 hour ago

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Explore flights from Ontario/LA to San Francisco

Sep 2026
From$139*
Seen: 1 hour ago
One Way/Basic
Oct 2026
From$76*
Seen: 9 hrs ago
One Way/Basic
Nov 2026
From$76*
Seen: 21 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $76
cmp-daily-histogram-bars-legend-max-price-aria-label $418
Displaying fares for September-2026
  • ONT–SFO, 09/23/2026: From $418
    23

    Wed

    SEP

  • ONT–SFO, 09/24/2026: From $418
    24

    Thu

  • ONT–SFO, 09/25/2026: From $418
    25

    Fri

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

    Sat

  • ONT–SFO, 09/27/2026: From $418
    27

    Sun

  • ONT–SFO, 09/28/2026: From $139
    28

    Mon

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

    Tue

  • ONT–SFO, 09/30/2026: From $139
    30

    Wed

  • ONT–SFO, 10/01/2026: From $190
    01

    Thu

    OCT

  • ONT–SFO, 10/02/2026: From $190
    02

    Fri

  • ONT–SFO: cmp-view-offers-disclaimer. Find Offers
    03

    Sat

  • ONT–SFO, 10/04/2026: From $190
    04

    Sun

  • ONT–SFO, 10/05/2026: From $190
    05

    Mon

  • ONT–SFO, 10/06/2026: From $95
    06

    Tue

  • ONT–SFO, 10/07/2026: From $95
    07

    Wed

  • ONT–SFO, 10/08/2026: From $174
    08

    Thu

  • ONT–SFO, 10/09/2026: From $189
    09

    Fri

  • ONT–SFO, 10/10/2026: From $149
    10

    Sat

  • ONT–SFO, 10/11/2026: From $209
    11

    Sun

  • ONT–SFO, 10/12/2026: From $194
    12

    Mon

  • ONT–SFO, 10/13/2026: From $143
    13

    Tue

  • ONT–SFO, 10/14/2026: From $76
    14

    Wed

  • ONT–SFO, 10/15/2026: From $81
    15

    Thu

  • ONT–SFO, 10/16/2026: From $189
    16

    Fri

  • ONT–SFO: cmp-view-offers-disclaimer. Find Offers
    17

    Sat

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

    Sun

  • ONT–SFO: cmp-view-offers-disclaimer. Find Offers
    19

    Mon

  • ONT–SFO, 10/20/2026: From $76
    20

    Tue

  • ONT–SFO: cmp-view-offers-disclaimer. Find Offers
    21

    Wed

  • ONT–SFO, 10/22/2026: From $174
    22

    Thu

    • Range$76-$418

    *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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