The incident occurred over the Rutor glacier near La Thuile, in the Aosta Valley, close to northern Italy’s border with France and Switzerland.
The crash seemed to have happened just after the helicopter took off, unaware that the aircraft was landing, Italian media reported.
“The collision happened in flight, probably at a few dozen metres above ground,” Alpine rescue group leader Paolo Comune told the media.
“The wreckage from the aircrafts was spread over an area of about 400 metres square.”
The helicopter was carrying a German alpine guide and four German heli-skiers, while the French four-seater tourist plane had three people on board.
All six on board the helicopter, including Italian pilot Maurizio Scarpelli, were killed, along with one of the people from the plane.
A French and a Swiss person on board the plane were seriously injured.
The two people who remained missing were found after the search resumed on Saturday morning, rescuers said.
All those on board the two aircraft are now accounted for.
Investigators are now working to piece together what led to the crash.
Italian police on Sunday investigated a French pilot over the collision.
The man, who is one of the only two survivors of the incident, was questioned in hospital.
