Travel days are limited to Tuesday, Wednesday, and Saturdays on select dates in January. If you can't find a roundtrip that's in sync with your travel dates, one-way flights can be purchased for $57 allowing you to piece together a custom itinerary that works best for you. This fare also works in the reverse direction from San Jose to Newark for those needing to head east.
Searching on AA.com, I found seats departing EWR on Saturday, January 12 and returning from SJC on Wednesday, January 16, 2019.
See our Newark (EWR) fare listings for a complete look at current finds.
Need a room in San Jose? Have a look at what's available for the above dates on Hotelwatchdog.