The calculated distance (air line) between Skarżysko-Kamienna and Olsztyn is approximately 185 miles respectively 298 kilometers.
By car or train, the actual journey to Olsztyn is certainly longer, as only the direct route (as the crow flies) between Skarżysko-Kamienna and Olsztyn has been calculated here.
Air line (approximately)
298 kilometers
161 nautical miles