Ryanair carried a record 7.5 million passengers last month, according to the airline's latest figures.
That marks an increase in traffic of 25% on last year.
Ryanair said the results were down to offering lower fares in order to increase the number of people it carried on each flight.
It said the latest figures marked continued success of its Always Getting Better - branding campaign.
Rolling annual traffic to Jan grew 17% to 102.9m customers.