The 37-year-old former Juventus and Italy star received a warm and rousing welcome from a 500-strong crowd, some of whom had arrived at the airport as early as 5.30am local time.
The crowd, wearing Sydney FC and Juve shirts, chanted Del Piero's name right up until their hero emerged, just before midday.
Del Piero, who followed his wife and three young children into the bedlam, took his time as he signed autographs and got acquainted with the fans of his new club.
Smiling all the way through the airport and sporting a Sydney FC scarf, the forward paused for a quick chat with the media before being whisked away.
"I am not here for the end of my career, I am here for the start of my new career," Del Piero said.
Asked if he wants to win titles with his new club, Del Piero said: "I want to win some. I play to win."
The A-League's biggest name is expected to join up with his new team-mates on Tuesday and is scheduled to play in a trial match against Newcastle next Saturday.