There are no rail links directly from Linate Airport, therefore you must take a taxi, Starfly or ATM (No. X73) Shuttle Bus Service into Milan Central Station.
Destinations on eastside of lake by train
If you’re heading for the east side of the lake, take the shuttle bus from the airport to Milan Central Station and from there you need to take the train heading to Sondrio or Tirano. Journey times; 40 minutes to Lecco, 1 hour to Varenna and 1½ hour to Colico, which is the furthest point on the east side of the lake from Milan.
There are also trains running between Lecco and Colico and stopping at a number of less well known stations along the east side of the lake.
Remember to punch your ticket in one of the yellow ticket machines before going on to the platform. Failure to do so may result in you having to pay a hefty fine.