The calculated distance (air line) between San Martino Buon Albergo and Trieste is approximately 131 miles respectively 210 kilometers.
By car or train, the actual journey to Trieste is certainly longer, as only the direct route (as the crow flies) between San Martino Buon Albergo and Trieste has been calculated here.
Air line (approximately)
210 kilometers
114 nautical miles