The calculated distance (air line) between Petrila and Piatra Neamţ is approximately 172 miles respectively 277 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Petrila and Piatra Neamţ has been calculated here.
Air line (approximately)
277 kilometers
150 nautical miles