A December boost on the back of lower fares following the terrorist alerts in Paris and Brussels saw Ryanair carryings rise by a quarter in the month to 7.5 million passengers.
The figure for last month enabled the low-cost airline to claim that it has become the first to carry more than 100 million international passengers in a single year.
The airline’s 2015 annual carryings rose by 17% to 101.4 million.
Chief marketing officer, Kenny Jacobs, said: “On the back of lower fares in December, following the terrorist events in Paris and Brussels, Ryanair’s monthly traffic grew by 25% to 7.5 million customers, while our load factor jumped 3% points to 91%.
“Our traffic growth over the past two years has been remarkable, rising by 50% over our December 2013 traffic figure of 5 million.
“We are pleased that over 101 million international customers chose to fly with Ryanair in 2015, as we became the first airline to reach this international traffic landmark.
“This is thanks to our load factor active/yield passive pricing, our expanding route network and the continuing success of our ‘Always Getting Better’ customer experience programme, which continues to deliver stronger than expected traffic and load factors, albeit at lower fares.”