The calculated distance (air line) between Horezu and Piatra Neamţ is approximately 165 miles respectively 266 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Horezu and Piatra Neamţ has been calculated here.
Air line (approximately)
266 kilometers
143 nautical miles