The calculated distance (air line) between Sępólno Krajeńskie and Wrocław is approximately 164 miles respectively 264 kilometers.
By car or train, the actual journey to Wrocław is certainly longer, as only the direct route (as the crow flies) between Sępólno Krajeńskie and Wrocław has been calculated here.
Air line (approximately)
264 kilometers
142 nautical miles