Uruguay's Santiago Urrutia became the first champion from South America since Raphael Matos in 2005, driving for Team Pelfrey. Urrutia, who joined the series for the 2015 season after a year in GP3, won only three races during the season – at NOLA Motorsports Park, the Indianapolis Motor Speedway and Mid-Ohio – but consistent finishing (finishing 14 of 16 races in the top-5) saw him finish 53 points clear of his nearest rival in the championship standings. Second place in the standings went to Cape Motorsports driver Neil Alberico, holding off a late-season challenge from Juncos Racing's Garett Grist for the position, by a tally of eight points. Alberico won four races during the season – which was the most by any driver, shared with Andretti Autosport's Weiron Tan – while Grist won three of the final six races including a weekend sweep at Laguna Seca.
