Question : How long do most people stay in Rome when they fly in from South Bend?
Answer : Of course you're not most people, but if you were, you'd stay roughly 82 days.
Question : Is price more important than specific travel days for you?
Answer : Sunday is your cheapest day to fly in December. Being flexible with your travel days garners you even more savings during your booking.
Question : Are prices changing frequently for this route?
Answer : Prices for this trip tend to change much more than others. The further out you book a route, the more likely you are to save.