The calculated distance (air line) between Szczawno-Zdrój and Bydgoszcz is approximately 177 miles respectively 284 kilometers.
By car or train, the actual journey to Bydgoszcz is certainly longer, as only the direct route (as the crow flies) between Szczawno-Zdrój and Bydgoszcz has been calculated here.
Air line (approximately)
284 kilometers
154 nautical miles