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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.
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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
United States. California. Ontario International. Compare Ontario International Airport flights across hundreds of providers. Find the cheapest month or even day of the year to fly. Book the best flight with no fees.
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Find flights to Ontario from $67. Fly from California on WestJet, Flair Airlines and more. Search for Ontario flights on KAYAK now to find the best deal.
The cheapest ticket to Ontario from the United States found in the last 72 hours was $26 one-way, and $92 round-trip. The most popular route is New York LaGuardia to Toronto Pearson Intl and the cheapest round-trip airline ticket found on this route in the last 72 hours was $199.
