SWO to ONT, Stillwater Regional Airport to Ontario International Airport Cheap Flights

Based on HopeGoo data, American Airlines offers one-way fares as low as US$422 on Cheapest nonstop routes (e.g. SWO to ONT on Wed, Apr 1), while American Airlines offers Cheapest nonstop round-trips from US$564 departing on Thu, Apr 9 and returning on Sun, Apr 12.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from Stillwater 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 Stillwater 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 Wed, Apr 1, with one-way flights priced at just US$422. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is American 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 December. · Get exclusive promo codes for HopeGoo app users.

The cheapest months to fly from Stillwater to Ontario is November, when demand for travel is lower.

After crunching the numbers on our March flight calendar, it's currently cheapest to fly from Stillwater to Ontario on March 10, 2026 with American Airlines, with prices starting at US$581.

The time difference between Ontario and Stillwater is 2h.

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