SAN-FLL (via EWR)
It's a valid routing on CO. The fare (Fare Basis Code: VE14BSNX) is currently $298 with 14 days advance purchase and a Saturday night stay. Leaving prior to midnight on a Saturday will meet the that requirement, even if you return immediately.
SAN-EWR 2,425 miles
EWR-FLL 1,092 miles
FLL-EWR 1,092 miles
EWR-SAN 2,425 miles
Total 7,034 miles
Many times bonus or promo miles do not count toward elite status. Be sure to read the fine print. Good luck!