The calculated distance (air line) between An Muileann gCearr and Blanchardstown is approximately 41 miles respectively 66 kilometers.
By car or train, the actual journey to Blanchardstown is certainly longer, as only the direct route (as the crow flies) between An Muileann gCearr and Blanchardstown has been calculated here.
Air line (approximately)
66 kilometers
35 nautical miles