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