The Dublin Airport Authority has revised its advice to passengers concerning security screening issues.
Over recent weeks, there have been lengthy queues reported at the airport.
Anyone due to fly out of the airport to an EU or UK short-haul destination in the coming days is asked to arrive up to two and a half hours before their departure time.
In a statement, the daa said: "Passengers flying on short-haul flights taking off after 08.30 are advised not to arrive at the airport any earlier than 06.00."
For long-haul flights it is recommended that passengers arrive up to three and a half hours before departure.
The daa said this will "alleviate pressure on the passenger security screening area".
Before going to the airport, passengers are advised to check with their airline as to when check-in and bag drop-off opens.
They are also being encouraged to check-in for their flight online where possible.
The daa said the new advice comes after security queuing times improved since the end of March and over the Easter weekend.
It said security screening will stay open 24 hours a day, seven days a week in Terminal 1, with security open in Terminal 2 from 4am.
Advice to passengers will remain under review and "may adjust..., either up or down, as necessary over the coming period as the peak of the summer season approaches".
The daa said around 200,000 passengers departed Dublin Airport over the Easter weekend.
It was the highest number of departures over four consecutive days since Christmas 2019.
It said no passenger missed their flight as a result of security delays, with "the vast majority of passengers" being processed through security "in under 40 minutes in both terminals".
According to the daa, it is in the process of hiring almost 300 new security screening staff.
