The calculated distance (air line) between Néa Filadélfeia and Thessaloníki is approximately 185 miles respectively 298 kilometers.
By car or train, the actual journey to Thessaloníki is certainly longer, as only the direct route (as the crow flies) between Néa Filadélfeia and Thessaloníki has been calculated here.
Air line (approximately)
298 kilometers
161 nautical miles