The calculated distance (air line) between So Kwun Wat and Mong Kok is approximately 11 miles respectively 18 kilometers.
By car or train, the actual journey to Mong Kok is certainly longer, as only the direct route (as the crow flies) between So Kwun Wat and Mong Kok has been calculated here.
Air line (approximately)
18 kilometers
10 nautical miles