Ireland West Airport Knock (Irish: Aerfort Iarthar Éireann Chnoc Mhuire) is a regional airport located 5.6km (3.5 miles) south-west of Charlestown, County Mayo, Ireland. The village of Knock is 20km (12.5 miles) away. In 2014, 703,318 passengers used the airport, making it 4th busiest in the Republic of Ireland after Dublin, Cork and Shannon Airport. It was previously known as Knock International Airport, Connaught Regional Airport, and Horan International Airport. Some airlines (especially low-cost airlines) know it as Knock Ireland West.