The calculated distance (air line) between Kowloon Tong and Tung Chung is approximately 15 miles respectively 25 kilometers.
By car or train, the actual journey to Tung Chung is certainly longer, as only the direct route (as the crow flies) between Kowloon Tong and Tung Chung has been calculated here.
Air line (approximately)
25 kilometers
13 nautical miles