In a statement, the airport said delays were likely to continue to be experienced at peak hours over the coming weeks as it looks to hire additional security staff.
"We are sorry for the stress and inconvenience caused, particularly to those who missed a flight as a result," a spokesperson said. "We deeply regret that our valued customers had this experience."
Passengers travelling through Dublin in the coming days and weeks have been advised to arrive a minimum of two hours before boarding a short-haul flight and three hours before a long-haul flight.
