The calculated distance (air line) between Néa Erythraía and Thessaloníki is approximately 183 miles respectively 294 kilometers.
By car or train, the actual journey to Thessaloníki is certainly longer, as only the direct route (as the crow flies) between Néa Erythraía and Thessaloníki has been calculated here.
Air line (approximately)
294 kilometers
159 nautical miles