Following the 2018 season, D.C. declined the 2019 contract option on DeLeon. In December 2018, he was selected by Toronto FC in the 2018 MLS Re-Entry Draft. DeLeon scored his first goal for Toronto FC in the 2019 season opener on March 2, 2019 against Philadelphia Union. He scored a goal against his former club, D.C. United on June 29, 2019. He scored against D.C. United again in the 2019 MLS Cup Playoffs on October 19, 2019. The game ended in a 5–1 win for Deleon's side. On October 30, 2019, Deleon scored the winning goal against Atlanta United FC in a 2–1 win. He departed Toronto FC after the 2021 season.
