I had initially planned to take trains back from Wengen to Zurich, then fly to Catania. But I have no reason to return to Zurich and am now thinking it might be cheaper, or take less time, to go from Wengen to the Milano airport and fly from there to Catania. Or is this about 6 of one and half a dozen of the other?
If flying from Milano is a better option, would I change to the Milano train in Interlakken Ost or at Spiez? And does the airport stop come before Milano Centrale?