The calculated distance (air line) between Lesznowola and Bydgoszcz is approximately 142 miles respectively 229 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Lesznowola and Bydgoszcz has been calculated here.
Air line (approximately)
229 kilometers
123 nautical miles