The calculated distance (air line) between Choi Wun and Tung Chung is approximately 18 miles respectively 28 kilometers.
By car or train, the actual journey to Tung Chung is certainly longer, as only the direct route (as the crow flies) between Choi Wun and Tung Chung has been calculated here.
Air line (approximately)
28 kilometers
15 nautical miles