Ryanair said the number of passengers it carried on its planes in June rose by 2% to 7.96 million from 7.79 million the same time last year.
Its load factor - how many seats it fills on each flight - was steady at 84% last month.
The airline said it has carried a record 79.9 million passengers in the six months to the end of June, up 4% on the same time in 2012.
