Southwest® flights from Ontario/LA to Louisville from $145

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Low fares from Ontario/LA to Louisville

$

Ontario/LA (ONT)to

Louisville (SDF)
Depart: 09/11/2026

One-way

Basic

From
$145
Seen: 18 hrs ago

Ontario/LA (ONT)to

Louisville (SDF)
Depart: 10/07/2026

One-way

Basic

From
$163
Seen: 5 hrs ago

Ontario/LA (ONT)to

Louisville (SDF)
Depart: 09/09/2026

One-way

Basic

From
$163
Seen: 2 hrs ago

Ontario/LA (ONT)to

Louisville (SDF)
Depart: 09/07/2026

One-way

Basic

From
$163
Seen: 16 hrs ago

Ontario/LA (ONT)to

Louisville (SDF)
Depart: 08/29/2026

One-way

Basic

From
$163
Seen: 15 hrs ago

Ontario/LA (ONT)to

Louisville (SDF)
Depart: 09/11/2026

One-way

Choice

From
$195
Seen: 18 hrs ago

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Explore flights from Ontario/LA to Louisville

Aug 2026
From$163*
Seen: 15 hrs ago
One Way/Basic
Sep 2026
From$145*
Seen: 18 hrs ago
One Way/Basic
Oct 2026
From$163*
Seen: 5 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $163
cmp-daily-histogram-bars-legend-max-price-aria-label $371
Displaying fares for August-2026
  • ONT–SDF: cmp-view-offers-disclaimer. Find Offers
    02

    Sun

    AUG

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    03

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    04

    Tue

  • ONT–SDF, 08/05/2026: From $291
    05

    Wed

  • ONT–SDF, 08/06/2026: From $371
    06

    Thu

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    07

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    08

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    09

    Sun

  • ONT–SDF, 08/10/2026: From $371
    10

    Mon

  • ONT–SDF, 08/11/2026: From $291
    11

    Tue

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    12

    Wed

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    13

    Thu

  • ONT–SDF, 08/14/2026: From $294
    14

    Fri

  • ONT–SDF, 08/15/2026: From $291
    15

    Sat

  • ONT–SDF, 08/16/2026: From $294
    16

    Sun

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    17

    Mon

  • ONT–SDF, 08/18/2026: From $206
    18

    Tue

  • ONT–SDF, 08/19/2026: From $206
    19

    Wed

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    20

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    21

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    22

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    23

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    24

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    25

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    26

    Wed

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    27

    Thu

  • ONT–SDF, 08/28/2026: From $199
    28

    Fri

  • ONT–SDF, 08/29/2026: From $163
    29

    Sat

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    30

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    31

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    SEP

    • Range$163-$371

    *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:
    Louisville International Airport
    Distance:
    1796 miles

    Route Information

    84† 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 84 weekly flights from Ontario/LA to Louisville on Southwest Airlines.
    To find the lowest fares by day and time to fly Ontario/LA to Louisville with Southwest, check out our Low Fare Calendar.
    You can rent a car at Louisville International Airport book yours with your flight.
    Yes! Flights from Ontario/LA to Louisville—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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