The calculated distance (air line) between Wexford and Dún Laoghaire is approximately 68 miles respectively 109 kilometers.
By car or train, the actual journey to Dún Laoghaire is certainly longer, as only the direct route (as the crow flies) between Wexford and Dún Laoghaire has been calculated here.
Air line (approximately)
109 kilometers
59 nautical miles