The calculated distance (air line) between Miercurea-Ciuc and Ploieşti is approximately 97 miles respectively 157 kilometers.
By car or train, the actual journey to Ploieşti is certainly longer, as only the direct route (as the crow flies) between Miercurea-Ciuc and Ploieşti has been calculated here.
Air line (approximately)
157 kilometers
84 nautical miles