The calculated distance (air line) between Aranyaprathet and Samut Prakan is approximately 128 miles respectively 206 kilometers.
By car or train, the actual journey to Samut Prakan is certainly longer, as only the direct route (as the crow flies) between Aranyaprathet and Samut Prakan has been calculated here.
Air line (approximately)
206 kilometers
111 nautical miles