The calculated distance (air line) between Kostrzyn nad Odrą and Bydgoszcz is approximately 145 miles respectively 233 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Kostrzyn nad Odrą and Bydgoszcz has been calculated here.
Air line (approximately)
233 kilometers
126 nautical miles