Market overview: Which Kia models are currently the most popular on the used car market? AutoUncle has analysed 21,841 used Kia cars that are currently for sale at 44 dealerships. The three most popular Kia models as used cars are: Sportage, Picanto, Niro. Prices start at around £3,995, and the average price for a Kia on today’s used car market is £16,981.