The calculated distance (air line) between Mueang Nonthaburi and Samut Sakhon is approximately 27 miles respectively 43 kilometers.
By car or train, the actual journey to Samut Sakhon is certainly longer, as only the direct route (as the crow flies) between Mueang Nonthaburi and Samut Sakhon has been calculated here.
Air line (approximately)
43 kilometers
23 nautical miles