To save up to 36% on this flight, we recommend booking at least 61 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Harrisburg to Ontario from $306 1-2 weeks out and tickets from $373 for flights departing within the next 72 hours.
Due to multiple factors, expect to potentially pay more when booking in November. For low rates, September can be a great choice for travel to Ontario. Flights to Ontario from Harrisburg in September are about $286 on average during September, but can be found for as low as $137.