Passengers flying from Dublin Airport are being advised to arrive two hours before short-haul flights and three hours before long-haul trips in a relaxation of the recommendations from airport management.
The move comes as the airport authority has reported a "significant improvement" in security screening queue times.
Passengers checking in a bag should allow additional time of up to an hour, the daa said.
The previous advice from Dublin Airport was for passengers to arrive two-and-a-half hours before a short-haul flight and three-and-a-half hours before a long-haul flight.
Dalton Philips, daa CEO, said: "During July - Dublin Airport's busiest month in three years - over three million passengers flew in and out of the airport.
"99% of all passengers passed through security in under 45 minutes, while 90% of passengers queued for 30 minutes or less.
"In the first two weeks of August, virtually all passengers were through security screening in 30 minutes or less."
This improved performance is the result of a continued bolstering of the security screening operation at Dublin Airport, with a concerted and ongoing recruitment drive to bring staffing levels back to 2019 levels, the daa said.
The Defence Forces, which had been on standby to take up posts at vehicle check points at Dublin Airport in the event of a major Covid outbreak, are now being stood down.
The daa said the contingency was clearly defined in terms of the role and timeline, lasting no more than six weeks, in non-public facing duties, which has now elapsed.
Hopes to reduce security times further
While there have been improvements in the time needed to get through the security screening at the airport, the group head of communications at daa has said they expect to reduce this further in the near future.
Speaking on RTÉ's News at One, Kevin Cullinane said that queues had "normalised" but in recent weeks the challenge had been making sure people did not miss flights and very few people had to queue outside of the building.
"The real challenge was in May, and over last number of weeks virtually no passengers have been queuing outside the terminal's designated areas," he said.
He also said that other elements of the service at the airport, such as food and beverage services, had been improving.
Mr Cullinane added that the daa expects anyone who missed a flight in recent months to be compensated fully by the end of the month.
"As of last week 75% of passengers have been fully recompensed but some details are left to clarify, but the vast majority will be fully reimbursed by the end of this month," he said.