The calculated distance (air line) between Marmara Ereğlisi and Sultangazi is approximately 49 miles respectively 78 kilometers.
By car or train, the actual journey to Sultangazi is certainly longer, as only the direct route (as the crow flies) between Marmara Ereğlisi and Sultangazi has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles