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