The calculated distance (air line) between Tha Muang and Samut Prakan is approximately 69 miles respectively 111 kilometers.
By car or train, the actual journey to Samut Prakan is certainly longer, as only the direct route (as the crow flies) between Tha Muang and Samut Prakan has been calculated here.
Air line (approximately)
111 kilometers
60 nautical miles