The calculated distance (air line) between Chiajna and Piatra Neamţ is approximately 171 miles respectively 275 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Chiajna and Piatra Neamţ has been calculated here.
Air line (approximately)
275 kilometers
148 nautical miles