The calculated distance (air line) between South Horizons (Estate) and Tung Chung is approximately 13 miles respectively 22 kilometers.
By car or train, the actual journey to Tung Chung is certainly longer, as only the direct route (as the crow flies) between South Horizons (Estate) and Tung Chung has been calculated here.
Air line (approximately)
22 kilometers
12 nautical miles