Most main Italian airports have flights to Spain the airlines are Iberia Vueling and some low cost like Easy jet and Ryan Air.
if you have 4 days I suggest you concentrate on one area/ city .
See www.trenitalia.it for train timetables and fares.
Four days? Italy is a big country - take a look at the map to give yourself a perspective. If you have four days for Venice, then I can understand that but not for the whole country. I assume that you also have four days for Spain and, if yes, I would suggest that you pick either Italy or Spain this time around.
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