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Use Google Flights to explore cheap flights to anywhere. Search destinations and track prices to find and book your next flight.
Use Google Flights to find cheap departing flights to Ontario and to track prices for specific travel dates for your next getaway.
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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.
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.
Find cheap tickets to Ontario from anywhere in California. KAYAK searches hundreds of travel sites to help you find cheap airfare and book the flight that suits you best. With KAYAK you can also compare prices of plane tickets for last minute flights to Ontario from anywhere in California.
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.
