Flavius Felix serves during the reign of emperors Valentinian III and Theodosius II.

Between 425, the year in which he had been made patricius, and 429 he had served as magister utriusque militae in defense of Italy, but despite a brief mention of one of his military actions in the Notitia Dignitatum, his subordinates Bonifacius and Flavius Aetius were considered more significant in this regard.

In 426, he had ordered the death of Patroclus, bishop of Arelate, and of Titus, deacon in Rome.

The following year he had opposed Bonifacius' rebellion in Northern Africa sending some troops to this province, but this force had been defeated by the troops loyal to Bonifacius.

He had been elected consul for the West in 428.

His carved ivory consular diptych is notable for depicting his clothing in great detail.

The diptych, believed to be the earliest yet known, will survive intact until the French Revolution, when the right leaf was stolen; it is now believed lost.

In May 430, Felix, his wife Padusia and a deacon are accused of plotting against Aetius, arrested in Ravenna and killed by order of Aetius himself.