On 8 March 2007 it was announced that Gommendy had been signed to drive for PKV Racing in the 2007Champ Car season as a teammate to Neel Jani. At Houston and Long Beach, he led several laps before breaking down with few laps to go. Later at Circuit Mont-Tremblant, Gommendy won the pole and track record. He participated in twelve of the first thirteen races and finished 12th in points with a best finish of fourth in his final start at TT Circuit Assen.
With Champ Car merging with IndyCar the following year, resulting in fewer available race seats, Gommendy joined Superleague Formula driving for F.C. Porto, winning a race at ACI Vallelunga Circuit in 2008 and Donington Park in 2009. Gommendy continued in Superleague Formula with other teams and little success until the series shut down mid-way through the 2011 season.
In 2011 following the dissolution of Superleague Formula, Gommendy was largely out of racing until he appeared in the 2013 24 Hours of Le Mans for Signatech in their LMP2 Alpine A450. The team finished 14th overall and 8th in class. He raced at the LMP2 class 2014 European Le Mans Series for Thiriet by TDS Racing, winning at Silverstone. The Frenchman remained at the team for the 2015 European Le Mans Series, claiming a win at Imola and a second place at Red Bull Ring. For the 2016 European Le Mans Series, the driver switched to Eurasia Motorsport, finishing second at Red Bull Ring.
On September 11, 2017, it was announced that Gommendy would return to American open-wheel racing, making his Indianapolis 500 debut at the 2018 Indianapolis 500, driving for Schmidt Peterson Motorsports in a partnership with former Larrousse F1 team boss Didier Calmels. However, that deal has since fallen through.