April was another record month for Ryanair despite the month being hit by more air traffic control strikes in Belgium, France, Greece and Italy.
Passenger numbers grew 10% to 9.9 million and load factor rose 2 percentage points to 93%.
Rolling traffic to April grew 17% to 107.4 million passengers.
Meanwhile Eastern European low-cost airline Wizz Air also reported strong growth in April.
Passenger numbers jumped 15.8% to nearly 1.8 million, while load factor rose by 3 percentage points to 86.5%.
Traffic increases were boosted by a 15.4% rise in capacity.
Rolling traffic to April for Wizz Air grew 20.6% to 20 million passengers and rolling load factor climbed 1.4 percentage points to 88.2%.
