Flights arrive daily at the San Francisco (SFO) and Oakland (OAK) Airports. So far, flights from 12/31 or 1/1 to 1/4 or 1/5 have given us the best results (around $350-$450 round trip per person).
San Jose Airport (SJC) is also nearby, but you'll likely need a car to get around. We have linked flight searches for the most commonly used airports below (consider deleting browser cookies while searching!):