SLC Airport has one terminal and five concourses: A, B, C, D, and E. SLC Spirit terminal operates out of Concourse E. Concourse E is located on the north side of the terminal and is the newest concourse at SLC Airport. It opened in 2017 and features 18 gates, a food court, a variety of shops, and a spa.
https://www.airfleetrating.com/airport/what-terminal-is-spirit-at-slc-airport/