Aer Lingus says it carried 925,000 passengers last month, a fall of 1.7% compared with the same month last year. The airline said the June figures were hit by uncertainty caused by the threat of industrial action by pilots.
Aer Lingus's load factor - the percentage of seats filled - fell by 2.1 points from June last year to 80%.
Short-haul passenger numbers in June fell by 1.4% from a year earlier, while numbers on longer routes dropped by 4.3%. The short-haul load factor in June was 78.6%, down 1.1 points from June last year, while the long-haul load factor fell 4.1 points to 83.1%.
Earlier this week, Ryanair, EasyJet and IAG reported increases in traffic for June.
For the first six months of 2011, Aer Lingus carried 4.5 million passengers, a drop of 2.5% on the same period last year. The load factor was down 3.2 points to 72.3%.
