Users have found that booking a flight from Portland to Ontario at least 61 days early can save you up to 36% on average compared to booking a flight this week. If booking 61 days before your flight isn’t an option for you, users have found flights from Portland to Ontario for as little as $306 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $373 for flights departing within the next 3 days.
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 Portland in September are about $286 on average during September, but can be found for as low as $137.