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Ontario Intl Airport offers nonstop flights to 17 cities. Every week, at least 476 domestic flights and 8 international flights depart from Ontario Intl Airport. Show more
If traveling to Ontario, the cheapest city to fly from in the last 3 days was San Francisco, with flights as low as $33 one-way and $38 round-trip. Flights from Seattle are the most searched and start at $48 for a return trip.
Consider booking a flight to Los Angeles International Airport, Long Beach Airport, Hollywood Burbank Airport, or John Wayne Airport Orange County. Got flexible travel plans? Use our Low Fare Calendar to find the lowest fares on flights to Ontario/LA available inside your travel window.
Flights from Ontario with Southwest Airlines®. Discover where Southwest ® flies out of Ontario International Airport and trade the West Coast for whatever’s next. Book. Flight. Round Trip. One-Way.
