The calculated distance (air line) between Sant'Ambrogio di Valpollicella and Prato is approximately 114 miles respectively 184 kilometers.
By car or train, the actual journey to Prato is certainly longer, as only the direct route (as the crow flies) between Sant'Ambrogio di Valpollicella and Prato has been calculated here.
Air line (approximately)
184 kilometers
99 nautical miles