Montoya won the opening race of the season at Grand Prix of St. Petersburg, then finished on the podium again at the Angie's List Grand Prix of Indianapolis and Toyota Grand Prix of Long Beach, 5th in the Grand Prix of Louisiana, and on May 24, 2015, Montoya passed his teammate Will Power with four laps to go to win the 2015 Indianapolis 500. He finished 2nd in the title standings to Scott Dixon on a count back much like the way he won the 1999 CART title from Dario Franchitti.