The calculated distance (air line) between Konstantynów Łódzki and Bydgoszcz is approximately 110 miles respectively 177 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Konstantynów Łódzki and Bydgoszcz has been calculated here.
Air line (approximately)
177 kilometers
96 nautical miles