Southwest® flights from Ontario/LA to Buffalo/Niagara Falls from $189

Promo Code

Low fares from Ontario/LA to Buffalo/Niagara Falls

$

Ontario/LA (ONT)to

Buffalo/Niagara Falls (BUF)
Depart: 10/27/2026

One-way

Basic

From
$189
Seen: 9 hrs ago

Ontario/LA (ONT)to

Buffalo/Niagara Falls (BUF)
Depart: 10/26/2026

One-way

Basic

From
$189
Seen: 5 hrs ago

Ontario/LA (ONT)to

Buffalo/Niagara Falls (BUF)
Depart: 11/17/2026

One-way

Basic

From
$189
Seen: 22 hrs ago

Ontario/LA (ONT)to

Buffalo/Niagara Falls (BUF)
Depart: 10/22/2026

One-way

Basic

From
$194
Seen: 1 hour ago

Ontario/LA (ONT)to

Buffalo/Niagara Falls (BUF)
Depart: 10/23/2026

One-way

Basic

From
$205
Seen: 17 hrs ago

Ontario/LA (ONT)to

Buffalo/Niagara Falls (BUF)
Depart: 11/23/2026

One-way

Basic

From
$244
Seen: 8 hrs ago

Looking for more low-fare flights?

Check out the Low Fare Calendar to find a fare that works for you. Just choose the month you want to depart and return, and we’ll show you the best fares available.

Find low fares

Explore flights from Ontario/LA to Buffalo/Niagara Falls

Oct 2026
From$189*
Seen: 9 hrs ago
One Way/Basic
Nov 2026
From$189*
Seen: 22 hrs ago
One Way/Basic
Dec 2026
No result for this month.
cmp-daily-histogram-bars-legend-min-price-aria-label $189
Displaying fares for October-2026
  • ONT–BUF, 10/01/2026: From $584
    01

    Thu

    OCT

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    02

    Fri

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

    Sat

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    04

    Sun

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    05

    Mon

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    06

    Tue

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    07

    Wed

  • ONT–BUF, 10/08/2026: From $514
    08

    Thu

  • ONT–BUF, 10/09/2026: From $514
    09

    Fri

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    10

    Sat

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    11

    Sun

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    12

    Mon

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    13

    Tue

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    14

    Wed

  • ONT–BUF, 10/15/2026: From $314
    15

    Thu

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    16

    Fri

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

    Sat

  • ONT–BUF, 10/18/2026: From $314
    18

    Sun

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

    Mon

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    20

    Tue

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

    Wed

  • ONT–BUF, 10/22/2026: From $194
    22

    Thu

  • ONT–BUF, 10/23/2026: From $205
    23

    Fri

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    24

    Sat

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    25

    Sun

  • ONT–BUF, 10/26/2026: From $189
    26

    Mon

  • ONT–BUF, 10/27/2026: From $189
    27

    Tue

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    28

    Wed

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

    Thu

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    30

    Fri

  • ONT–BUF: cmp-view-offers-disclaimer. Find Offers
    31

    Sat

    • Range$189-$584

    *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:
    Buffalo Niagara International Airport
    Distance:
    2173 miles

    Route Information

    65† 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 65 weekly flights from Ontario/LA to Buffalo/Niagara Falls on Southwest Airlines.
    To find the lowest fares by day and time to fly Ontario/LA to Buffalo/Niagara Falls with Southwest, check out our Low Fare Calendar.
    You can rent a car at Buffalo Niagara International Airport book yours with your flight.
    Yes! Flights from Ontario/LA to Buffalo/Niagara Falls—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.

    Explore Flights from Other Popular Origins

    Popular Flights from Ontario/LA