Farrell has represented the United States at the U18 World Championships in 2019 (alongside Helleson), where he notched two assists in seven games, the 2022 Olympic Games (alongside Helleson), where he led the team in scoring with six points (3-3=6) in four games, and at the 2022 and 2023 World Championships (alongside forward Cutter Gauthier), totaling eight points (3-5=8) in 20 games.
