The calculated distance (air line) between Dej and Piatra Neamţ is approximately 117 miles respectively 189 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Dej and Piatra Neamţ has been calculated here.
Air line (approximately)
189 kilometers
102 nautical miles