Costco Gas Prices in Chicago, IL

Chicago, Illinois has 2 Costco fuel centers serving members in the area. Across Chicago, regular gas averages $3.929 and premium runs about $1.15 higher at $5.079. That's about $0.18 above the Illinois statewide average of $3.744. Within Chicago, Costco Chicago South Loop posts the lowest regular at $3.699 and Lincoln Park the highest at $4.159 — a $0.46 spread worth checking before you fuel up. Across Chicago, regular pump prices have eased about $0.72 over the past month, from $4.649 a month ago. Premium has eased about $0.63 over the same period. None of the Chicago Costco fuel centers currently sell diesel.