Good to see plenty of availability for weekend travel, so this could be your next weekend getaway. The $299 fares are also available for SFO to Maui (OGG), and $323 fares are available for SFO to Kauai (LIH) and Big Island (KOA). However, SFO to HNL seems to yield the most availability since it's the most competitive route. Delta Airlines has matched the $299 SFO-HNL fare, which includes all taxes and fees. I would book soon as there is no telling how long this sale will last.