The calculated distance (air line) between Dzierżoniów and Bydgoszcz is approximately 175 miles respectively 282 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Dzierżoniów and Bydgoszcz has been calculated here.
Air line (approximately)
282 kilometers
152 nautical miles