The calculated distance (air line) between Skarżysko-Kamienna and Kielce is approximately 20 miles respectively 32 kilometers.
By car or train, the actual journey to Kielce is certainly longer, as only the direct route (as the crow flies) between Skarżysko-Kamienna and Kielce has been calculated here.
Air line (approximately)
32 kilometers
17 nautical miles