Quintero started the 2019 season off well, scoring once and assisting two more to give Minnesota a 3–1 win over the Vancouver Whitecaps in the opening game of the season. He was named to the MLS Team of the Week for Week 1 as a result. In their next game, Quintero scored once and picked up another assist to help the Loons to a 3–0 win against the San Jose Earthquakes. He was once again named to the Team of the Week. On 30 March, Quintero scored his third in the fourth game of the season, a 2–1 loss to the New England Revolution. On 3 April, Quintero suffered a groin injury, but it only forced him to miss one game. On 19 April, Quintero found the back of the net twice, but Minnesota fell to Toronto 4–3. He had 2 assists on 29 June as the Loons defeated FC Cincinnati 7–1. On 3 July Quintero scored once to help Minnesota get a 3–1 win over San Jose. He scored again on 20 July to help Minnesota get a 1–1 draw with Real Salt Lake. On 14 August, Quintero scored to give the Loons a 1–0 victory over the Colorado Rapids. Quintero scored two goals on 15 September to help Minnesota defeat Real Salt Lake 3–1. Although he didn't have as good as a season as 2018, Quintero still managed to score 10 league goals, which led the team. His 5 league assists were the third most on the team. He featured in the MLS team of the Weak four times throughout the season. Quintero also helped the Loons qualify for the MLS Cup Playoffs for the first time in club history. He came off the bench and provided an assist in their first round matchup, a 2–1 defeat to the LA Galaxy.