The work involved installing more than 300,000 square metres of new runway and taxiways, 6km (3.7km) of new internal airport roads, 7.5km (4.6 miles) of electrical cable and more than 2,000 new runway and taxiway lights, Irish broadcaster RTÉ reported, external.
The new runway, which runs parallel with the current one, will be able to accommodate larger long-haul aircraft.
Construction began in December 2016 but the project faced delays due to the Covid-19 pandemic.
Despite opposition from nearby residents, the runway will operate between 06:00 and midnight. This follows an amendment to the planning permission in 2020.
Up to 300 householders around the airport are set to receive a €20,000 (£16,844) grant from DAA to insulate their homes from air-traffic noise.
The first flight will take off between 11:30 and 12:30 local time and can be watched live here. , external
