In general, when booking your flight to Arequipa, September is the cheapest month on average.
Most flyers found that booking flight tickets 46 days in advance of their planned departure date is, on average, the best time to get cheap flights to Arequipa.
From most locations, the cheapest day to fly to Arequipa is Thursday. Most users found that departing on a Saturday was most expensive.
On average you can find the best deals on plane tickets to Arequipa when looking for flights with morning departure times.