Dublin Airport welcomed 3.1 million passengers in May, according to airport operator daa, while Cork Airport welcomed 282,000 passengers in the month.
The May total takes Cork Airport through the one million passenger level for the year to date.
Kenny Jacobs daa CEO, said Dublin Airport is experiencing another busy summer.
"May saw tens of thousands of football fans fly through Dublin Airport for the Europa League final, while new transatlantic services to Denver and Minneapolis took off during the month and are already proving very popular with passengers.
He said Cork Airport continues to experience strong support from the travelling public, with the high demand for overseas travel being matched by its airline partners.
"A jam-packed summer schedule featuring 48 routes, operated by eight airlines, provides really great choice for passengers in Munster and south Leinster. Cork Airport has become the number one choice for consumers across the South of Ireland when booking their summer holiday with superb destinations across Spain, Italy, France, Croatia, Portugal, and Greece on offer this year," he said.
"As Cork Airport continues to grow, we have further exciting plans on the cards which will be unveiled later this year."
