Ronayne made his debut for the Dublin senior football team in the 1979 Leinster Senior Football Championship final against Offaly. He won an All-Ireland Senior Football Championship medal in 1983 when a twelve-man Dublin team, dubbed the ‘Twelve Apostles’, defeated Galway in what was a tempestuous affair. In addition he won a total of four Leinster Senior Football Championship medals 1979, 1983, 1984, 1985, and an under 21 Leinster Football Championship medal in 1980. He won a National Football League medal with Dublin in 1987 beating Kerry 1-11 to 0-11 in the final.
During his career, Ronayne played for Dublin in four All-Ireland Senior Football Championship finals, eight Leinster Senior Football Championship Finals, two National Football League Finals, one Under-21 All-Ireland Football Championship Final, one Leinster Minor Football Championship Final and one Dublin Senior Football Championship Final with Clontarf.