The calculated distance (air line) between Sępólno Krajeńskie and Mokotów is approximately 170 miles respectively 274 kilometers.
By car or train, the actual journey to Mokotów is certainly longer, as only the direct route (as the crow flies) between Sępólno Krajeńskie and Mokotów has been calculated here.
Air line (approximately)
274 kilometers
148 nautical miles