The calculated distance (air line) between Madīnat an Naşr and Sinnūris is approximately 52 miles respectively 84 kilometers.
By car or train, the actual journey to Sinnūris is certainly longer, as only the direct route (as the crow flies) between Madīnat an Naşr and Sinnūris has been calculated here.
Air line (approximately)
84 kilometers
45 nautical miles