During the Norman occupation, Accadia was a very small town. It was damaged by the earthquake of 1456; on 21 July 1462, during the war between the Angevins and Aragonese for the kingdom of Naples, king Ferrante I of Aragon besieged and set fire to the town. Later on, Accadia was a fief of the Caracciolo-Del Balzo and finally of the Recco and Dentice families.
In 1811 after an administrative reform Accadia passed from the province of Capitanata to Irpinia. From 1861 until 1927 it was included in the province of Avellino, then returned to the province of Foggia in Puglia. The late nineteenth and early twentieth centuries were characterized by an economic stability based on agriculture, but the cholera epidemic of 1910 and the subsequent emigration overseas led to a decadence of the economy. The town was destroyed by an earthquake in 1930 and more recently also damaged by the 1980 Irpinia earthquake.