The calculated distance (air line) between Ernei and Piatra Neamţ is approximately 83 miles respectively 133 kilometers.
By car or train, the actual journey to Piatra Neamţ is certainly longer, as only the direct route (as the crow flies) between Ernei and Piatra Neamţ has been calculated here.
Air line (approximately)
133 kilometers
72 nautical miles