Dublin Airport said that passenger numbers surpassed the two million mark in February for the first time in its 79-year history.
February is traditionally the quietest month of the year for air travel.
Just over 2 million passengers passed through Dublin Airport in February, a 9% increase over the same time last year.
Passenger volumes to and from Europe increased by 12%, while UK traffic rose by 4% compared to last year as almost 765,000 passengers travelled to and from Britain.
Passenger numbers to and from North America increased by 15%, as more than 175,000 people travelled on transatlantic routes last month.
Other international traffic, mainly on routes to and from the Middle East, North Africa and Pacific Asia regions increased by 2%, as more than 62,000 passengers travelled on these routes in February.
Meanwhile, the number of passengers using Dublin Airport as a hub to connect to another destination increased by 18% in the first two months of the year.
More than 183,000 passengers connected through the airport in January and February.