Aer Lingus carried 614,000 passengers in January - down 5.7% on the same month of last year.
This included those carried on Aer Lingus Regional routes with the airline saying it reflected a planned reduction in short-haul capacity.
Aer Lingus’ long-haul passenger figures were up 22% to 72,000, however, with the opening of a number of new routes on its transatlantic operations boosting its numbers.
Overall, the airline’s passenger load factor for the month was up 2.4% to just under 69%.
