Ryanair overcame French air traffic control strikes last month to raise passenger numbers by 28% to 8.8 million passengers.
The year-on-year growth came as the low-fares carrier’s load factor increased by four percentage points to 94%.
The March figures mean that the airline’s rolling annual traffic figure grew by 18% to 106.4 million.
Chief marketing officer, Kenny Jacobs, said: “These record monthly numbers were delivered despite three days of unjustified French ATC strikes in March, which caused the cancellation of over 500 flights, due to our lower fares, stronger forward bookings and the continuing success of our ‘Always Getting Better’ programme.
“Our 106 million customers can look forward to further improvements in 2016 as we will shortly launch Year 3 of ‘AGB’.”