On 25 July 2017, Ingles re-signed with the Jazz to a multi-year contract. Ingles was a starter for the entire first half of the season before coming off the bench for the first time on 19 January 2018 against the New York Knicks. A day later, in a 125–113 win over the Los Angeles Clippers, Ingles scored a career-high 21 points, reaching the 20-point mark for just the third time in his career. On 30 January 2018, he hit a career-high six 3-pointers and scored 20 points in a 129–99 win over the Golden State Warriors. On 9 February 2018, he set a new career high with 23 points in a 106–94 win over the Charlotte Hornets. Two days later, he had a 24-point effort in a 115–96 win over the Portland Trail Blazers. On 24 February 2018, in a 97–90 win over the Dallas Mavericks, Ingles played in his 200th straight game for the Jazz and finished with 12 points and eight assists. He recorded his 150th 3-pointer of the season during the game, trailing only Randy Foye (178) and Rodney Hood (161) for most 3-pointers in a single season for a Jazz player. On 7 March 2018, he recorded the first double-double of his NBA career with 11 points and 10 assists in a 104–84 win over the Indiana Pacers. On 17 March 2018, he recorded 14 points, nine assists and seven rebounds in a 103–97 win over the Sacramento Kings. Ingles made three 3-pointers to push his season total to 179, breaking the Jazz record of 178 set by Foye during the 2012–13 season. Five days later, in a 119–112 win over the Mavericks, Ingles had 18 points and 10 assists, equaling his career high. On 5 April 2018, in a 117–95 win over the Clippers, Ingles became the first Jazz player to make 200 3-pointers in a season. Three days later, he had 22 points on 9-of-12 shooting along with 10 assists in a playoff-clinching 112–97 win over the Los Angeles Lakers. In Game 3 of Utah's first-round playoff series against the Oklahoma City Thunder, Ingles scored 21 points, as the Jazz took a 2–1 lead in the series with a 115–102 win. The Jazz went on to win the series in six games. In Game 2 of the Jazz's second-round series against the Houston Rockets, Ingles scored a career-high 27 points with a career-best seven 3-pointers in a 116–108 win, helping Utah tie the series at 1–1.