2012-13: Kyle Flanagan signed a one-year entry-level contract with the Flyers in March 2013 following his senior season at Saint Lawrence and made his pro debut with Philadelphia's AHL affiliate in Adirondack. In 13 games with the Phantoms he scored 1 goal with 6 assists and had an even plus/minus with 4 penalty minutes. Adirondack missed the playoffs after finishing last in the Northeast Division. Flanagan was the second-leading scorer for the Saints, trailing only 28-goal scorer Greg Carey, in his final season of college hockey. He scored 15 goals and tied for the team lead with 32 assists while finishing +1 with 40 penalty minutes in 34 games. St. Lawrence tied for fifth in ECAC Hockey and lost to eventual national champion Yale in the playoff quarterfinals.
Flanagan began the 2013-14 season with Adirondack of the AHL.