Generally, when the offense connected with the court appearance was a felony, failure to appear is treated as a felony. When the offense that required an appearance in court was a misdemeanor, failure to appear is usually treated as a misdemeanor.
Felony failure to appear is defined in greater detail in Connecticut General Statutes (C.G.S.) §53a-172 and the definition of misdemeanor failure to appear is in C.G.S. §53a-173.