Upon the end of hostilities and the resumption of football in 1919, Blyth returned to Arsenal and immediately became a regular in the newly promoted side. An energetic "midfield dynamo", Blyth usually figured on the left of midfield, as a left half or inside left. He became a mainstay in the side, with over 300 league games in 10 seasons, and became club captain in 1925. He also played in the 1927 FA Cup Final, Arsenal's first cup final, which they lost 1–0 to Cardiff City. In total, he played 343 matches for Arsenal, scoring 51 goals.