The calculated distance (air line) between Skarżysko-Kamienna and Bydgoszcz is approximately 185 miles respectively 297 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Skarżysko-Kamienna and Bydgoszcz has been calculated here.
Air line (approximately)
297 kilometers
160 nautical miles