The calculated distance (air line) between Kowloon and Sham Shui Po is approximately 2 miles respectively 3 kilometers.
By car or train, the actual journey to Sham Shui Po is certainly longer, as only the direct route (as the crow flies) between Kowloon and Sham Shui Po has been calculated here.
Air line (approximately)
3 kilometers
2 nautical miles