The calculated distance (air line) between Skarżysko-Kamienna and Częstochowa is approximately 79 miles respectively 127 kilometers.
By car or train, the actual journey to Częstochowa is certainly longer, as only the direct route (as the crow flies) between Skarżysko-Kamienna and Częstochowa has been calculated here.
Air line (approximately)
127 kilometers
69 nautical miles