The calculated distance (air line) between Sibiu and Piatra Neamţ is approximately 130 miles respectively 209 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Sibiu and Piatra Neamţ has been calculated here.
Air line (approximately)
209 kilometers
113 nautical miles