Ah ok, I missed that it's only Italy.
I tried your SFO-FCO link above, tried changing airlines.
Then tried changing destination.
So Switzerland, France, Austria, Germany, etc. are about $500 more or higher.
BCN/LIS/OPO and quite a few more are all pricing around $1900. AM is pricing even lower, but no thanks. You use the link and plug in “Europe” as destination to see more availability.
Note that many of the AC flights have 2+ Segments per direction, making it an ideal partner airline to credit to UA for PQP earning a preferred partner and 200% earnings.