On March 7, O'Ward joined Carlin on a part-time deal that will see him drive in 13 races in the 2019 IndyCar season. O'Ward will drive Carlin's second entry for 12 races and will also drive Carlin's third entry for the Indianapolis 500. O'Ward failed to qualify for the Indy 500 along with Carlin teammate Max Chilton and the Carlin-prepared car of McLaren Racing's Fernando Alonso. O'Wards Red Bull deal signed in the Month of May also saw him only compete in 8 of the 13 events he originally signed for. He would be credited with 26th in the final points standings, with a best finish of 8th, at Circuit of the Americas.