Flynn was also a lightweight boxing competitor in the 2011 Commonwealth Youth Games where he won the silver medal.[3] He was the winner of the Editor's Award at the Sunday Mail Scottish Sports Awards 2014.[4]
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Flynn made his professional debut against Ibrar Riyaz on 14 December 2014 at a packed Thistle Hotel in Glasgow. Flynn claimed a 40-36 points win against the Englishman. The victory came four-and-a-half months after Flynn enjoyed success at Glasgow 2014.[6]
During the Commonwealth Games, Flynn was quoted post fight as saying "the Mailman delivers", referencing the fact that he worked in the sorting office of the Royal Mail and has used the nickname "The Mailman" since, having it displayed on his fight shorts.[citation needed]
In January 2018, Flynn announced his engagement to his partner Amber Farquhar.[8]