Costco Gas Prices in London, ON

London, Ontario has 2 Costco fuel centers serving members in the area. Across London, regular gas averages 154.9¢, premium runs about 19.0¢ higher at 173.9¢, and diesel sits at 168.9¢. That's about 5.5¢ above the Ontario provincewide average of 149.4¢. Within London, Costco N London posts the lowest regular at 154.9¢ and S London the highest at 154.9¢ — a 0.0¢ spread worth checking before you fuel up. Across London, regular pump prices have eased about 8.0¢ over the past month, from 162.9¢ a month ago. Premium has eased about 9.0¢ and diesel has eased about 14.0¢ over the same period. Diesel is available at 1 of the 2 London stations.