The calculated distance (air line) between Bolesławiec and Bydgoszcz is approximately 165 miles respectively 265 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Bolesławiec and Bydgoszcz has been calculated here.
Air line (approximately)
265 kilometers
143 nautical miles