The calculated distance (air line) between Tuen Mun San Hui and Tung Chung is approximately 8 miles respectively 13 kilometers.
By car or train, the actual journey to Tung Chung is certainly longer, as only the direct route (as the crow flies) between Tuen Mun San Hui and Tung Chung has been calculated here.
Air line (approximately)
13 kilometers
7 nautical miles