The calculated distance (air line) between Phan Thong and Samut Prakan is approximately 35 miles respectively 56 kilometers.
By car or train, the actual journey to Samut Prakan is certainly longer, as only the direct route (as the crow flies) between Phan Thong and Samut Prakan has been calculated here.
Air line (approximately)
56 kilometers
30 nautical miles