I take it the Metro line from the city center of Milan to Linate Airport is not yet complete. What are some ways that I might be able to get from the city center area to Linate?
We took a taxi and it wasn’t far from downtown.
We had our hotel (near Duomo) call a taxi for us. It was a quick trip and if I remember correctly, about 13 euros (this was a couple of years ago).
There is the Autostradale Bus that runs between Milano Centrale station, and the No 73 bus that runs from the south end of Piazza Diaz 2 blocks south of the Piazza Duomo.
https://moovit.com/?from=Duomo&to=Linate%20Aeroporto&fll=45.463689_9.188718&tll=45.461485_9.278791&customerId=4908&metroId=223&lang=en
Here are all the ways, from the airport's website: http://www.milanolinate-airport.com/en/directions-and-parking/to-and-from
Since it's close to the center of Milan (unlike Malpensa or Bergamo airports), a taxi is reasonable, but there are also buses.