The calculated distance (air line) between Carrick-on-Suir and Rathfarnham is approximately 81 miles respectively 130 kilometers.
By car or train, the actual journey to Rathfarnham is certainly longer, as only the direct route (as the crow flies) between Carrick-on-Suir and Rathfarnham has been calculated here.
Air line (approximately)
130 kilometers
70 nautical miles