The flight from Lima is about one hour and forty five minutes. Nonetheless, if you are flying from Cusco to Iquitos, then the flight is above 5 hrs long and there is normally a stopover in Lima, and, needless to say, it is dearer. Journey with a paddle boat on https://puertomaldonadotours.com/tour/amazon-jungle-tours-peru-sandoval-lake-3-days/