Lima is the jumping-off point for trips to Cuzco, Machu Picchu and the Nazca Lines. Scott’s Cheap Flights has found a $430 roundtrip fare from Austin to Lima.
You can search for this airfare on Google Flights, Kayak and Momondo. Momondo may find the least-cost from Austin, but that website sometimes shows fares that are not actually book-able.
Flights may include a stopover in Mexico City.
Airfares this low won’t last long…Scott anticipates that this one will last “a day or two.”