The calculated distance (air line) between Miercurea-Ciuc and Cluj-Napoca is approximately 108 miles respectively 174 kilometers.
By car or train, the actual journey to Cluj-Napoca is certainly longer, as only the direct route (as the crow flies) between Miercurea-Ciuc and Cluj-Napoca has been calculated here.
Air line (approximately)
174 kilometers
94 nautical miles