To save on the cost of your flight from Portland to Peru, book at least 51 days before your planned departure. Booking around this time can save you about 17% on the cost of this flight compared to booking a flight leaving this week. We have found prices from $615 if you need a flight within two weeks. For flights within the next 72 hours, you can find tickets from as low as $641.
Due to multiple factors, expect to potentially pay more when booking in December. For low rates, August can be a great choice for travel to Peru. Flights to Peru from Portland in August are about $539 on average during August, but can be found for as low as $218.