The calculated distance (air line) between Sa Dec and Vĩnh Thạnh is approximately 25 miles respectively 40 kilometers.
By car or train, the actual journey to Vĩnh Thạnh is certainly longer, as only the direct route (as the crow flies) between Sa Dec and Vĩnh Thạnh has been calculated here.
Air line (approximately)
40 kilometers
22 nautical miles