Jun 6, 2018 - 4:42 PM
I would say:-
Bern to Olten and change
Olten to Lugano and change for a regional train, or Olten to Milano Centrale via Chiasso which will stop in Como.
PS- Don’t get on the Milano Centrale train via Stresa otherwise you’ll waste an hour or so changing in Milan.
I highly recommend Lake Lugano over Como;)