In December 2012, Nikolai Fomenko, the engineering director of Marussia F1, announced that Chilton would race for the team full-time in 2013. The team confirmed the next day that Chilton would race. Chilton qualified 20th on his debut at the Australian GP. He achieved his best finish of the season at the 2013 Monaco Grand Prix, when he finished in 14th place following several retirements. He achieved his best qualifying result of 16th position at the 2013 Belgian Grand Prix in a mixed-weather session where he was one of three drivers to go out on slick tyres at the end when the track's condition was improving.