The Saratoga Springs, NY, native played for the Rangers the past two seasons after spending 2013-14 with the Carolina Eagles Elite division team.
In two seasons with the Rangers, Flynn has chipped in five goals and six assists.
“Ryan brings it every day in practice and in games,” said Rangers head coach Vinnie Montalbano. “His strong work ethic and desire to get better every shift will serve as a great example for his college teammates, just as it did for the Rangers.”
Flynn is one of two Rangers who will suit up for the Mustangs for their inaugural season in the fall.