The calculated distance (air line) between Dollard-Des Ormeaux and Montréal is approximately 11 miles respectively 18 kilometers.
By car or train, the actual journey to Montréal is certainly longer, as only the direct route (as the crow flies) between Dollard-Des Ormeaux and Montréal has been calculated here.
Air line (approximately)
18 kilometers
10 nautical miles