The calculated distance (air line) between Agios Ioannis Rentis and Tríkala is approximately 150 miles respectively 241 kilometers.
By car or train, the actual journey to Tríkala is certainly longer, as only the direct route (as the crow flies) between Agios Ioannis Rentis and Tríkala has been calculated here.
Air line (approximately)
241 kilometers
130 nautical miles