Around 350,000 passengers are set to travel through Dublin Airport this Bank Holiday weekend, between Friday and Monday.
Almost 190,000 are set to depart from the airport over the four days, according to daa, the operator of the airport.
Graeme McQueen, Media Relations Manager at daa said more than 2,200 flights are due to arrive and depart over the long weekend.
"Friday is expected to be the busiest day of the weekend with almost 100,000 passengers travelling through the airport," he said
"Over the four days, an average of 87,000 passengers will fly in or out of the airport each day.
"That's 56% higher than the same weekend last year and more than 90% of the number that travelled during the October Bank Holiday weekend in 2019," he added.
The daa is reminding passengers travelling on Sunday morning that the clocks go back one hour on Saturday night.
It is also advising people to check which terminal their flight is departing from before leaving home.
Aer Lingus, Emirates, Delta, United Airlines and American Airlines operate from Terminal 2, while all other airlines operate from Terminal 1.
The daa said passengers should plan to arrive in the terminal building at least two hours before their flight departure time to short-haul destinations and three hours in advance for long-haul flights.
Passengers should allow an extra hour if checking in a bag at the airport, it said.
"Please remember that EU security regulations state that liquids over 100mls cannot be brought through the security screening area," the daa said in a statement.
"Liquids under 100mls are permitted and should be placed in a transparent, re-sealable bag measuring not more than 20cm x 20cm. Exemptions are in place for medicines and for baby food," it said.
If you're travelling with children, the daa said to use the family lanes provided at the security screening area.
The daa is encouraging passengers to download the Dublin Airport app, which will provide information such as flight arrival and departure times and estimated times to get through security screening areas.
Meanwhile, Cork Airport has said it expects 43,000 passengers to pass through the airport this weekend.
"43,000 passengers represent a 95% recovery on the 2019 October Bank Holiday weekend," said Roy O'Driscoll, Acting Manager Director at Cork Airport.
Mr O'Driscoll said they are reminding passengers to arrive at least two hours before their flight is due to depart and to allow additional time if checking-in a bag at the airport.
"Passengers are encouraged to refer to corkairport.com for helpful tips on how to prepare for airport security - in particular, with reference to liquid restrictions in carry-on bags," he said.
