The calculated distance (air line) between Boyalık and Büyükçekmece is approximately 17 miles respectively 27 kilometers.
By car or train, the actual journey to Büyükçekmece is certainly longer, as only the direct route (as the crow flies) between Boyalık and Büyükçekmece has been calculated here.
Air line (approximately)
27 kilometers
15 nautical miles