Costco Gas Prices in South San Francisco, CA

South San Francisco, California has 2 Costco fuel centers serving members in the area. Across South San Francisco, regular gas averages $5.099 and premium runs about $0.35 higher at $5.449. That's about $0.26 above the California statewide average of $4.841. Within South San Francisco, Costco El Camino posts the lowest regular at $5.099 and S San Francisco the highest at $5.099 — a $0.00 spread worth checking before you fuel up. Across South San Francisco, regular pump prices have eased about $0.53 over the past month, from $5.629 a month ago. Premium has eased about $0.45 over the same period. None of the South San Francisco Costco fuel centers currently sell diesel.