The calculated distance (air line) between New Rochelle and Spuyten Duyvil is approximately 7 miles respectively 12 kilometers.
By car or train, the actual journey to Spuyten Duyvil is certainly longer, as only the direct route (as the crow flies) between New Rochelle and Spuyten Duyvil has been calculated here.
Air line (approximately)
12 kilometers
6 nautical miles