At a press conference in the Hungarian capital, O'Leary said the country's Constitutional Court could issue a ruling in the windfall profit tax case in June. Passenger numbers on Ryanair's Budapest flights could rise to an annual 6 million if the decision is favorable, he added.

This year, passenger numbers on Ryanair's Budapest flights could reach 4 mln, preserving its 32% market share.

The airline has 500 flights a week on its summer timetable for Budapest.