SLSG Pro LLC was awarded the USL Pro franchise on May 1, 2014. That same day, the club announced that they would play their home games at the 5,500 seat World Wide Technology Soccer Park in Fenton, Missouri. Dale Schilly, the youth club director of SLSG, was named head coach. On June 2, 2014, it was announced that the team's name was Saint Louis Football Club. Former AC St. Louis player Mike Ambersley was the first player signed to the team on January 13, 2015. On January 16, 2015, the team announced their affiliation with the Chicago Fire of Major League Soccer. St. Louis FC played their inaugural game on March 28, 2015, losing to Louisville City 2–0. Their first victory was against the Tulsa Roughnecks on April 2, 2015, winning 2–0. Jeremie Lynch scored the team's first ever goal in the 42nd minute. Their home debut was a 1–1 draw against the Pittsburgh Riverhounds on April 11, 2015, before of a sellout crowd of 5,280. The team's first home win came against the Wilmington Hammerheads on May 9, 2015, with the winning goal by Sam Fink. On May 16, 2016, Saint Louis FC announced that they had acquired the PDL team Springfield Synergy FC and renamed the team as Saint Louis FC U-23. On August 15, 2016, Saint Louis FC announced that Dale Schilly had been relieved of coaching duties; Tim Leonard was named as interim head coach. On October 12, 2016 Saint Louis FC introduced Preki as the new head coach. On February 15, 2017, Saint Louis FC and the Chicago Fire did not renew their affiliation for the 2017 season. On November 19, 2017, the club announced that Preki and the club were parting ways by mutual agreement. Anthony Pulis joined the team from Orlando City B to take over the role of head coach the next day.
Supporters
The official supporters group of Saint Louis FC is the St. Louligans. The St. Louligans were founded in 2010 when several local soccer fan groups joined forces at AC St. Louis home games. These small groups eventually decided to create a new group to unite them all, and the St. Louligans were born. They have provided strong support for a number of St. Louis area soccer teams, including: AC St. Louis, Saint Louis Athletica, St. Louis Lions, and Illinois Piasa Saint Louis FC is working very closely with the St. Louligans to encourage their support, and on July 9, 2014, the club awarded the Louligans with the first Saint Louis FC season ticket. The group has promised that for each home game, they will give a new fan the ticket as a way to encourage new fans to join the St. Louligans and support Saint Louis FC. Ahead of the inaugural 2015 season, the Louligans coordinated with the Coopers, supporters for Louisville City FC, to create the Kings' Cup rivalry competition between the two expansion teams. The rivalry has been incredibly one-sided on the field in Louisville's favor, but the two SGs enjoy interacting with each other and traveling to each others' matches.
Colors and logo
The club conducted a fan vote to decide the team's crest. The logo chosen includes a fleur-de-lis, which acts as the focal point of the logo and pays tribute to Saint Louis' French heritage. Also included in the logo is a reference to the year the city was founded, 1764, and five lines to represent the club's five core values: unity, humility, passion, respect, and tradition.
Year-by-year
Head coaches
Includes USL Regular season, USL Play-offs and Lamar Hunt U.S. Open Cup
Sam Fink 
Lewis Hilton 
Irvin Herrera