The calculated distance (air line) between Musāfir-Khāna and Lucknow is approximately 63 miles respectively 101 kilometers.
By car or train, the actual journey to Lucknow is certainly longer, as only the direct route (as the crow flies) between Musāfir-Khāna and Lucknow has been calculated here.
Air line (approximately)
101 kilometers
54 nautical miles