The calculated distance (air line) between Velimeşe and Büyükçekmece is approximately 40 miles respectively 65 kilometers.
By car or train, the actual journey to Büyükçekmece is certainly longer, as only the direct route (as the crow flies) between Velimeşe and Büyükçekmece has been calculated here.
Air line (approximately)
65 kilometers
35 nautical miles