Southwest® flights from Greenville-Spartanburg to Ontario/LA from $304

Promo Code

Low fares from Greenville-Spartanburg to Ontario/LA

$

Greenville-Spartanburg (GSP)to

Ontario/LA (ONT)
Depart: 08/18/2026

One-way

Basic

From
$304
Seen: 6 hrs ago

Greenville-Spartanburg (GSP)to

Ontario/LA (ONT)
Depart: 09/19/2026

One-way

Basic

From
$329
Seen: 13 hrs ago

Greenville-Spartanburg (GSP)to

Ontario/LA (ONT)
Depart: 08/18/2026

One-way

Choice

From
$359
Seen: 6 hrs ago

Greenville-Spartanburg (GSP)to

Ontario/LA (ONT)
Depart: 09/19/2026

One-way

Choice

From
$384
Seen: 13 hrs ago

Greenville-Spartanburg (GSP)to

Ontario/LA (ONT)
Depart: 08/18/2026

One-way

Choice Preferred

From
$439
Seen: 6 hrs ago

Greenville-Spartanburg (GSP)to

Ontario/LA (ONT)
Depart: 09/19/2026

One-way

Choice Preferred

From
$464
Seen: 13 hrs ago

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Explore flights from Greenville-Spartanburg to Ontario/LA

Aug 2026
From$304*
Seen: 6 hrs ago
One Way/Basic
Sep 2026
From$329*
Seen: 13 hrs ago
One Way/Basic
Oct 2026
No result for this month.
cmp-daily-histogram-bars-legend-min-price-aria-label $304
Displaying fares for August-2026
  • GSP–ONT: cmp-view-offers-disclaimer. Find Offers
    05

    Wed

    AUG

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    06

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  • GSP–ONT, 08/08/2026: From $569
    08

    Sat

  • GSP–ONT, 08/09/2026: From $574
    09

    Sun

  • GSP–ONT, 08/10/2026: From $494
    10

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    11

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  • GSP–ONT, 08/12/2026: From $494
    12

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    16

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    17

    Mon

  • GSP–ONT, 08/18/2026: From $304
    18

    Tue

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    19

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    30

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    31

    Mon

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    01

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    SEP

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    • Range$304-$574

    *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:
    Greenville-Spartanburg International Airport
    Arriving at:
    LA/Ontario International Airport
    Distance:
    2010 miles

    Route Information

    41† 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 41 weekly flights from Greenville-Spartanburg to Ontario/LA on Southwest Airlines.
    To find the lowest fares by day and time to fly Greenville-Spartanburg to Ontario/LA with Southwest, check out our Low Fare Calendar.
    You can rent a car at LA/Ontario International Airport book yours with your flight.
    Yes! Flights from Greenville-Spartanburg to Ontario/LA—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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