Costco Gas Prices in London, ON

London, Ontario has 2 Costco fuel centers serving members in the area. Across London, regular gas averages 166.9¢, premium runs about 25.0¢ higher at 191.9¢, and diesel sits at 238.9¢. That's about 2.8¢ above the Ontario provincewide average of 164.2¢. Within London, Costco N London posts the lowest regular at 166.9¢ and S London the highest at 166.9¢ — a 0.0¢ spread worth checking before you fuel up. Across London, regular pump prices have eased about 6.0¢ over the past month, from 172.9¢ a month ago. Premium has eased about 5.0¢ and diesel has climbed about 4.0¢ over the same period. Diesel is available at 1 of the 2 London stations.