The calculated distance (air line) between Włoszczowa and Bydgoszcz is approximately 178 miles respectively 286 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Włoszczowa and Bydgoszcz has been calculated here.
Air line (approximately)
286 kilometers
154 nautical miles