Some of us will reach Cogne on sunday the 30th of March afternoon taking a train from Torino to Aosta and then a bus to Cogne.Â
The closest airport to Cogne is Torino's one.
From Torino to Aosta:
By train, look at Trenitalia.
From Aosta to Cogne city center:
There are buses travelling from Aosta to Cogne, check the timetable here.