The calculated distance (air line) between An Muileann gCearr and Ballincollig is approximately 125 miles respectively 201 kilometers.
By car or train, the actual journey to Ballincollig is certainly longer, as only the direct route (as the crow flies) between An Muileann gCearr and Ballincollig has been calculated here.
Air line (approximately)
201 kilometers
108 nautical miles