Good Morning kitten:
if you are flying out of Europe:
you must look for return-flights. It's cheaper.
Check for return flights and just do not use the return segment. Result for some combination:
One-way about 1300 EUR
1 month more 800 EUR
4 monthes less 800 EUR
If you visit British Airways Website (Italy) you can get a return flight to Miami for less than 700 EUR (4 monthes combination). And book a seperate flight from Miami to Pensacola.
Happy New Year + Happy Cruising