The calculated distance (air line) between Marmaracık and Büyükçekmece is approximately 45 miles respectively 73 kilometers.
By car or train, the actual journey to Büyükçekmece is certainly longer, as only the direct route (as the crow flies) between Marmaracık and Büyükçekmece has been calculated here.
Air line (approximately)
73 kilometers
39 nautical miles