The calculated distance (air line) between Nieuw-Lekkerland and Amstelveen is approximately 29 miles respectively 47 kilometers.
By car or train, the actual journey to Amstelveen is certainly longer, as only the direct route (as the crow flies) between Nieuw-Lekkerland and Amstelveen has been calculated here.
Air line (approximately)
47 kilometers
26 nautical miles