The calculated distance (air line) between Blachownia and Bydgoszcz is approximately 167 miles respectively 269 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Blachownia and Bydgoszcz has been calculated here.
Air line (approximately)
269 kilometers
145 nautical miles