The calculated distance (air line) between Luduş and Piatra Neamţ is approximately 110 miles respectively 177 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Luduş and Piatra Neamţ has been calculated here.
Air line (approximately)
177 kilometers
96 nautical miles