The calculated distance (air line) between Marmara Ereğlisi and Esenler is approximately 48 miles respectively 78 kilometers.
By car or train, the actual journey to Esenler is certainly longer, as only the direct route (as the crow flies) between Marmara Ereğlisi and Esenler has been calculated here.
Air line (approximately)
78 kilometers
42 nautical miles