The calculated distance (air line) between Sai Ying Pun and Tung Chung is approximately 13 miles respectively 21 kilometers.
By car or train, the actual journey to Tung Chung is certainly longer, as only the direct route (as the crow flies) between Sai Ying Pun and Tung Chung has been calculated here.
Air line (approximately)
21 kilometers
11 nautical miles