“My son was not a terrorist. He never prayed and he drank. This is what happens under the influence of drink and cannabis,” the father of Ziyed Ben Belgacem told France's Europe 1 radio.
Ben Belgacem triggered a major scare at Orly international airport south of Paris on Saturday morning when he grabbed a female soldier on patrol and put a gun to her head.
He seized her assault rifle, saying he wanted to “die for Allah” and kill others, before being shot dead by the soldier's two colleagues.
The attack came around two hours after Ben Belgacem, who had several convictions for armed robbery, fired on police after being pulled over for speeding after spending the night in a bar.
An officer was lightly injured in that attack in the Garges-les-Gonesse suburb north of Paris, which set in motion a series of events culminating with Ben Belgacem's death at the airport.
The father, who was released from police custody on Sunday after being questioned, said his son phoned him minutes after the shooting “in a state of extreme agitation”.
“He said to me: 'Daddy, please forgive me. I've screwed up with a police officer.'
He then cut short the conversation and drove to the airport, stealing another car en route.
His father then presented himself at a police station, where he was later informed of his son's death.
Ben Belgacem's brother and cousin, who also came forward for questioning Saturday, are still being quizzed by anti-terror investigators.