The calculated distance (air line) between Huedin and Piatra Neamţ is approximately 155 miles respectively 250 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Huedin and Piatra Neamţ has been calculated here.
Air line (approximately)
250 kilometers
135 nautical miles