The calculated distance (air line) between Sant'Angelo di Piove di Sacco and Trieste is approximately 89 miles respectively 143 kilometers.
By car or train, the actual journey to Trieste is certainly longer, as only the direct route (as the crow flies) between Sant'Angelo di Piove di Sacco and Trieste has been calculated here.
Air line (approximately)
143 kilometers
77 nautical miles