The calculated distance (air line) between Residence Bel-air and Tseung Kwan O is approximately 9 miles respectively 15 kilometers.
By car or train, the actual journey to Tseung Kwan O is certainly longer, as only the direct route (as the crow flies) between Residence Bel-air and Tseung Kwan O has been calculated here.
Air line (approximately)
15 kilometers
8 nautical miles