The calculated distance (air line) between Samut Prakan and Bang Khun Thian is approximately 12 miles respectively 19 kilometers.
By car or train, the actual journey to Bang Khun Thian is certainly longer, as only the direct route (as the crow flies) between Samut Prakan and Bang Khun Thian has been calculated here.
Air line (approximately)
19 kilometers
10 nautical miles