Southwest® flights from Ontario/LA to Montrose, CO from $148

Promo Code

Low fares from Ontario/LA to Montrose, CO

$

Ontario/LA (ONT)to

Montrose, CO (MTJ)
Depart: 11/05/2026

One-way

Basic

From
$148
Seen: 23 hrs ago

Ontario/LA (ONT)to

Montrose, CO (MTJ)
Depart: 11/05/2026

One-way

Choice

From
$188
Seen: 23 hrs ago

Ontario/LA (ONT)to

Montrose, CO (MTJ)
Depart: 11/05/2026

One-way

Choice Preferred

From
$258
Seen: 23 hrs ago

Ontario/LA (ONT)to

Montrose, CO (MTJ)
Depart: 11/05/2026

One-way

Choice Extra

From
$303
Seen: 23 hrs ago

Ontario/LA (ONT)to

Montrose, CO (MTJ)
Depart: 08/31/2026

One-way

Choice

From
$342
Seen: 19 hrs ago

Ontario/LA (ONT)to

Montrose, CO (MTJ)
Depart: 08/31/2026

One-way

Choice Preferred

From
$412
Seen: 19 hrs ago

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Explore flights from Ontario/LA to Montrose, CO

Aug 2026
From$342*
Seen: 19 hrs ago
One Way/Basic
Sep 2026
From$580*
Seen: 12 hrs ago
One Way/Basic
Oct 2026
From$519*
Seen: 14 hrs ago
One Way/Basic
cmp-daily-histogram-bars-legend-min-price-aria-label $342
Displaying fares for August-2026
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  • ONT–MTJ, 08/31/2026: From $342
    31

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  • ONT–MTJ, 09/04/2026: From $580
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    • Range$342-$580

    *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:
    Montrose Regional Airport
    Distance:
    622 miles

    Route Information

    25† 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 25 weekly flights from Ontario/LA to Montrose, CO on Southwest Airlines.
    To find the lowest fares by day and time to fly Ontario/LA to Montrose, CO with Southwest, check out our Low Fare Calendar.
    You can rent a car at Montrose Regional Airport book yours with your flight.
    Yes! Flights from Ontario/LA to Montrose, CO—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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