The calculated distance (air line) between Chanthaburi and Samut Sakhon is approximately 139 miles respectively 224 kilometers.
By car or train, the actual journey to Samut Sakhon is certainly longer, as only the direct route (as the crow flies) between Chanthaburi and Samut Sakhon has been calculated here.
Air line (approximately)
224 kilometers
121 nautical miles