Southwest® flights from Buffalo/Niagara Falls to Ontario/LA from $200

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Low fares from Buffalo/Niagara Falls to Ontario/LA

$

Buffalo/Niagara Falls (BUF)to

Ontario/LA (ONT)
Depart: 12/08/2026

One-way

Basic

From
$200
Seen: 20 hrs ago

Buffalo/Niagara Falls (BUF)to

Ontario/LA (ONT)
Depart: 12/04/2026

One-way

Basic

From
$240
Seen: 21 hrs ago

Buffalo/Niagara Falls (BUF)to

Ontario/LA (ONT)
Depart: 01/31/2027

One-way

Basic

From
$254
Seen: 20 hrs ago

Buffalo/Niagara Falls (BUF)to

Ontario/LA (ONT)
Depart: 12/08/2026

One-way

Choice

From
$255
Seen: 20 hrs ago

Buffalo/Niagara Falls (BUF)to

Ontario/LA (ONT)
Depart: 12/13/2026

One-way

Basic

From
$259
Seen: 20 hrs ago

Buffalo/Niagara Falls (BUF)to

Ontario/LA (ONT)
Depart: 01/24/2027

One-way

Basic

From
$259
Seen: 3 hrs ago

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Explore flights from Buffalo/Niagara Falls to Ontario/LA

Nov 2026
From$399*
Seen: 23 hrs ago
One Way/Basic
Dec 2026
From$200*
Seen: 20 hrs ago
One Way/Basic
Jan 2027
From$254*
Seen: 20 hrs ago
One Way/Basic
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Displaying fares for November-2026
  • BUF–ONT, 11/11/2026: From $599
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    NOV

  • BUF–ONT, 11/12/2026: From $599
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  • BUF–ONT, 11/16/2026: From $599
    16

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  • BUF–ONT, 11/30/2026: From $399
    30

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    DEC

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  • BUF–ONT, 12/04/2026: From $240
    04

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  • BUF–ONT, 12/05/2026: From $260
    05

    Sat

  • BUF–ONT, 12/06/2026: From $289
    06

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  • BUF–ONT, 12/08/2026: From $200
    08

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    • Range$200-$599

    *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:
    Buffalo Niagara International Airport
    Arriving at:
    LA/Ontario International Airport
    Distance:
    2173 miles

    Questions we hear the most

    There are 82 weekly flights from Buffalo/Niagara Falls to Ontario/LA on Southwest Airlines.
    To find the lowest fares by day and time to fly Buffalo/Niagara Falls 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 Buffalo/Niagara Falls 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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