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