The calculated distance (air line) between Saint-Lin-Laurentides and Longueuil is approximately 27 miles respectively 44 kilometers.
By car or train, the actual journey to Longueuil is certainly longer, as only the direct route (as the crow flies) between Saint-Lin-Laurentides and Longueuil has been calculated here.
Air line (approximately)
44 kilometers
24 nautical miles