Ryanair expects to carry more than 3 million passengers over the festive period.
The expected total for the period between December 20 and January 6 will be an increase of 100,000 over last Christmas and new year, setting a new record.
Ryanair will operate flights up to 2.20pm on Christmas Eve, resuming flights at 9.30am on Boxing Day.
Extra Christmas flights to Germany and Poland are booking up fast, while more families are booking winter sun holidays on extra flights to the Canary Islands. Winter breaks to Barcelona and Milan also proving popular, the budget carrier said.
The projected Christmas carryings came as the carrier cut its excess baggage fee in half to £10 per kg from Monday.