[13] In 2013, Chatin decided to switch to sports car racing, joining Team Endurance Challenge in the LMPC category of the European Le Mans Series.

[16] The team struggled despite Chatin's speed, proven by a fastest lap at Silverstone and a pole position in Imola, scoring a best result of seventh four times to finish eighth overall.

[21] Reunited with Lafargue, Rojas, and IDEC Sport for the 2019 season, Chatin would start the year off with two runner-up finishes, before taking a pole position at Barcelona.

[23] At the following round in Spa, a crash for Chatin at Raidillon during practice forced IDEC to miss qualifying, though thanks to the sourcing of a new chassis the team recovered to sixth on Sunday.

[24] Chatin redeemed himself during the season finale in Portugal, charging through to take the lead from Phil Hanson before holding on to win the race and, by extension, the championship.

[26] The trio managed a highest finish of seventh place and ended the season ninth in the teams' championship, with Chatin missing a race after contracting COVID-19.

[30] During the first half of the season, Chatin and his teammates took three successive top 5 finishes, with the highlight being an imposing late stint by the French driver at Monza which brought victory back to the team.

[32] Though the squad failed to win a race, Chatin was able to lead IDEC to fifth in the standings with two LMP2 Pro class podiums and a pole position at the final event in Portimão.

At the 24 Hours of Le Mans meanwhile, Chatin took LMP2 pole for the second time in his career, before putting the team in contention for a class podium — the chances of which were reduced to zero due to a late puncture.

[34] Joined by silver-ranked rookie Alex Quinn at the endurance events, the duo took four podiums from seven races, including a win at Road America, and clinched the LMP2 class title with a runner-up result at Petit Le Mans.