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Find low faresSouthwest® flights from Ontario/LA to Buffalo/Niagara Falls from $189
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1 Passenger
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Low fares from Ontario/LA to Buffalo/Niagara Falls
$
Ontario/LA (ONT)to
Buffalo/Niagara Falls (BUF)
Depart: 04/08/2026
One-way
Basic
From
$189
Seen: 12 hrs ago
Ontario/LA (ONT)to
Buffalo/Niagara Falls (BUF)
Depart: 03/11/2026
One-way
Basic
From
$209
Seen: 7 hrs ago
Ontario/LA (ONT)to
Buffalo/Niagara Falls (BUF)
Depart: 03/06/2026
One-way
Basic
From
$219
Seen: 20 hrs ago
Ontario/LA (ONT)to
Buffalo/Niagara Falls (BUF)
Depart: 04/06/2026
One-way
Basic
From
$219
Seen: 21 hrs ago
Ontario/LA (ONT)to
Buffalo/Niagara Falls (BUF)
Depart: 03/13/2026
One-way
Basic
From
$219
Seen: 7 hrs ago
Ontario/LA (ONT)to
Buffalo/Niagara Falls (BUF)
Depart: 03/09/2026
One-way
Basic
From
$219
Seen: 10 hrs ago
Explore flights from Ontario/LA to Buffalo/Niagara Falls
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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.