CLE to ONT, Cleveland Hopkins International Airport to Ontario International Airport Cheap Flights

Based on HopeGoo data, Frontier Airlines offers one-way fares as low as US$64 on Cheapest nonstop routes (e.g. CLE to ONT on Sat, Feb 28), while Frontier Airlines offers Cheapest nonstop round-trips from US$157 departing on Sat, Apr 25 and returning on Sat, May 2.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Cleveland to Ontario is around 40 days (6 weeks) in advance, and the best time to fly is usually on Tuesday, Wednesday, and Saturday. Tuesday typically offers the cheapest flights for departure, while Saturday offers the best return deals.

To find best deals on flights from Cleveland to Ontario, you can use various tools on HopeGoo: · Be flexible with your travel dates to get the cheapest flight deal. Now the cheapest flight deal is on Sat, Feb 28, with one-way flights priced at just US$64. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Frontier Airlines. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Avoid peak season unless you book very early. It seems the peak season for Ontario travel is around April. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Cleveland to Ontario is January, when demand for travel is lower.

After crunching the numbers on our February flight calendar, it's currently cheapest to fly from Cleveland to Ontario on February 27, 2026 with Frontier Airlines, with prices starting at US$186.

The time difference between Ontario and Cleveland is 3h.

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