To centre of Milan
You can take a shuttle bus from Linate Airport into Milan Central Station (Stazione Centrale) from where you will then need to take a train (or bus) onwards to Como. There are no train connections directly from this airport.
Starfly Shuttle (+39 02 5858 7237)
This shuttle bus service runs directly from Linate Airport (outside Arrivals) to Stazione Centrale in Milan. The bus runs approximately every 30 minutes during the day from 06:10 to 23:30. The journey takes approximately 30 minutes and costs €4. Please note that you can buy tickets on board this bus or alternativley at the Agenzia Autostradale Linate. Starfly bus timetable (please double check times either by phoning or asking at information desk inside the airport).
ATM Bus Service (+39 800 80 81 81)
Alternatively you can take the standard urban bus (No.73) from Linate Airport to Piazza San Babila, central Milan. (The bus runs approx every 10 minutes from 06:10 to around midnight every day. Tickets can be purchased from the machine, bar or news-stand before getting on the bus (please note that tickets cannot be purchased onboard this bus). Take the shuttle service into Milan Stazione Centrale (Central Station) and thereafter you can take the train to Como. ATM Bus website (for travel in and around Milan).
Once you reach Milan Central Station you can then take the train to Como San Giovanni Station. Journey time is approximately 40 minutes and costs around €9.
Destinations on westside of lake by bus
If your holiday destination is along the western branch of Lake Como, then from Como bus terminal (situated across the road from the Como Lago Nord train station) you can take the C10 bus to all destinations along the west side of the lake, and round as far as Colico which is at the north of the lake. To reach Bellagio take the C30 bus.