CSL to ONT, to Ontario International Airport Cheap Flights

Based on HopeGoo data, Hawaiian Airlines offers one-way fares as low as US$128 on Cheapest nonstop routes (e.g. SBP to ONT on Mon, Mar 9), while United Airlines offers Cheapest nonstop round-trips from US$253 departing on Wed, Mar 18 and returning on Wed, Mar 25.

By analyzing data from all airlines on the HopeGoo flight calendar, it looks like the best time to book a flight from San Luis Obispo County 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 San Luis Obispo County 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 Mon, Mar 9, with one-way flights priced at just US$128. · Compare airlines strategically. Budget carriers often provide the lowest base fares, while we found the most affordable airline currently operating on this route is Hawaiian Airlines. · Set up price alerts to easily monitor ticket prices without having to check every day. · Check HopeGoo flight deals and promo codes frequently. · Get exclusive promo codes for HopeGoo app users.

After crunching the numbers on our March flight calendar, it's currently cheapest to fly from San Luis Obispo County to Ontario on March 18, 2026 with United Airlines, with prices starting at US$253.

The time difference between Ontario and San Luis Obispo County is 0h.

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