The calculated distance (air line) between Gonnosfanadiga and Quartu Sant'Elena is approximately 36 miles respectively 59 kilometers.
By car or train, the actual journey to Quartu Sant'Elena is certainly longer, as only the direct route (as the crow flies) between Gonnosfanadiga and Quartu Sant'Elena has been calculated here.
Air line (approximately)
59 kilometers
32 nautical miles