The calculated distance (air line) between San Tung Chung Hang and Choi Wun is approximately 18 miles respectively 29 kilometers.
By car or train, the actual journey to Choi Wun is certainly longer, as only the direct route (as the crow flies) between San Tung Chung Hang and Choi Wun has been calculated here.
Air line (approximately)
29 kilometers
15 nautical miles