The calculated distance (air line) between Yuen Long San Hui and Tung Chung is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Tung Chung is certainly longer, as only the direct route (as the crow flies) between Yuen Long San Hui and Tung Chung has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles