Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from San Luis Obispo to Ontario as you normally would.
To save up to 82% on this flight, we recommend booking at least 32 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from San Luis Obispo to Ontario from $281 1-2 weeks out and tickets from $451 for flights departing within the next 72 hours.
September can be a great time to fly to Ontario from San Luis Obispo with a flight ticket averaging about $274. Cheapflights users have found deals in the month of September for as cheap as $66. The most expensive prices can be found in the month of July.