The calculated distance (air line) between Radzionków and Bielsko-Biala is approximately 40 miles respectively 65 kilometers.
By car or train, the actual journey to Bielsko-Biala is certainly longer, as only the direct route (as the crow flies) between Radzionków and Bielsko-Biala has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles