There are 2-4 flights daily from Athens to the city of Ioannina with Aegean Airlines. Flight duration is 55 minutes (Airport Phone: 26510 27058).
The distance from Ioannina airport to Aristi is 39 km.
From the Ioannina airport (or Ioannina city) you can easily get to Aristi by TAXI
(duration:~ 45mins, price: ~50E)