The calculated distance (air line) between Ratchaburi and Samut Sakhon is approximately 31 miles respectively 49 kilometers.
By car or train, the actual journey to Samut Sakhon is certainly longer, as only the direct route (as the crow flies) between Ratchaburi and Samut Sakhon has been calculated here.
Air line (approximately)
49 kilometers
27 nautical miles