The island's mayor, Vincenzo Campo, told the ANSA news agency two Canadairs were working on putting out the last flames on difficult terrain and that the wind had dropped off.
"After the great fear of last evening and the night spent at work, Pantelleria is returning to normal," Campo said. "It seems the worst is over."
Local officials appealed for any information that would help identify the cause of the blaze, which started in two points 400 meters apart.
Pantelleria, located between Sicily and the Tunisia, is a popular beach and trekking destination that includes ancient archaeological sites and natural geographic formations.
- Associated Press with additional reporting