[1] After playing for the University of Connecticut, Letunov was signed to an entry-level contract by the San Jose Sharks on 14 March 2018.

[4] As a group 6 free agent, Letunov left the Sharks and was signed to a one-year, two-way contract with the Carolina Hurricanes on 31 July 2021.

[5] After participating in the Hurricanes training camp, Letunov was assigned to AHL affiliate, the Chicago Wolves, to begin the 2021–22 season.

He made 60 appearances with the Wolves, posting 13 goals and 23 points, before he was traded by the Hurricanes to the New York Rangers in exchange for Tarmo Reunanen on 28 March 2022.

[6] Letunov as a free agent from the Rangers, opted to return to Russia and signed a contract with Torpedo Nizhny Novgorod for the 2022–23 season.