The calculated distance (air line) between Reggio Calabria and Caltanissetta is approximately 97 miles respectively 157 kilometers.
By car or train, the actual journey to Caltanissetta is certainly longer, as only the direct route (as the crow flies) between Reggio Calabria and Caltanissetta has been calculated here.
Air line (approximately)
157 kilometers
84 nautical miles