The calculated distance (air line) between Szydłowiec and Bydgoszcz is approximately 178 miles respectively 287 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Szydłowiec and Bydgoszcz has been calculated here.
Air line (approximately)
287 kilometers
155 nautical miles