The calculated distance (air line) between Horodnic de Sus and Piatra Neamţ is approximately 68 miles respectively 110 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Horodnic de Sus and Piatra Neamţ has been calculated here.
Air line (approximately)
110 kilometers
59 nautical miles