Ryanair recorded 4.68 million, or 8pc fewer booked passengers, last month, blaming this on its decision to ground more aircraft this winter.
Releasing data for November, the airline said in the year to date it had notched up 76.7 million booked passengers. It said it had expected last month's passenger traffic to decline by 10pc. The percentage of available seats sold was unchanged in November at 80pc.
The figures came as the Airports Council International Europe (ACI) -- of which outgoing DAA boss Declan Collier is president -- said there was a "significant slowdown" in European passenger growth during October. Overall passenger traffic at European airports increased by 3.4pc in October, compared to last year, but that growth rate was less than half that recorded in September.
European airports, including Dublin, that handle between 10 million and 25 million passengers a year reported a combined 2.7pc passenger growth rate in October.
Ryanair has just announced it's cutting 42 frequencies from its service from Latvia's capital Riga after the government said it would impose a new security tax on travellers.