To save up to 20% on this flight, we recommend booking at least 33 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Hilo to Ontario from $475 1-2 weeks out and tickets from $517 for flights departing within the next 72 hours.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Hilo to Ontario as you normally would.
Departing on a Saturday is a good option for securing a great price. You can expect to save up to 117% when planning your travel around this day of the week.