The patron of Monteflavio is San Rocco, celebrated on 16 August.
The feast of the Madonna dell'Assunta is dedicated to the Virgin every year in August: it is celebrated at the end of the week of San Rocco, with a procession, and the following day the festival closes with the day known in dialect as 'San Rocchittu'. The municipality also holds Santa Bonosa, the Madonna del Latino, the Chiesa del Calvario, San Martino and Monte Mozzone.