The calculated distance (air line) between Kai Tak and San Tung Chung Hang is approximately 17 miles respectively 27 kilometers.
By car or train, the actual journey to San Tung Chung Hang is certainly longer, as only the direct route (as the crow flies) between Kai Tak and San Tung Chung Hang has been calculated here.
Air line (approximately)
27 kilometers
14 nautical miles