The calculated distance (air line) between Târgu Ocna and Ploieşti is approximately 96 miles respectively 155 kilometers.
By car or train, the actual journey to Ploieşti is certainly longer, as only the direct route (as the crow flies) between Târgu Ocna and Ploieşti has been calculated here.
Air line (approximately)
155 kilometers
84 nautical miles