The calculated distance (air line) between Néa Smýrni and Irákleio is approximately 8 miles respectively 13 kilometers.
By car or train, the actual journey to Irákleio is certainly longer, as only the direct route (as the crow flies) between Néa Smýrni and Irákleio has been calculated here.
Air line (approximately)
13 kilometers
7 nautical miles