The calculated distance (air line) between Nankana Sahib and Kahna Nau is approximately 39 miles respectively 64 kilometers.
By car or train, the actual journey to Kahna Nau is certainly longer, as only the direct route (as the crow flies) between Nankana Sahib and Kahna Nau has been calculated here.
Air line (approximately)
64 kilometers
34 nautical miles