For the 1930 season, Dillon was called up to the National Hockey League by the New York Rangers where he would stay until 1939, never missing a single game during his time with the team. A left-handed shooter, Dillon scored 167 goals in total and led the Rangers in scoring during the 1935–36, 1936–37, and 1937–38 seasons averaging about 34 points per season. Dillon played an integral part in the Rangers Stanley Cup championship in the 1932–33 NHL season. Cecil scored seven goals in his first five games of the postseason, against the Montreal Canadiens, Detroit Red Wings and the first game of the Stanley Cup Finals against the Toronto Maple Leafs. The goal in the first game of the Finals was the game-winner, and he scored his eighth goal of the postseason in game 3, setting a team record, later tied by Vic Hadfield in 1971. Dillon was selected as one of the games stars for his work in holding the Primeau-Conacher-Jackson "Kid Line" to no goals in the final. Dillon's best season saw him score 25 goals in 48 games in 1934–35. He was a member of the First All-Star Team in 1937-38, and the Second All-Star Team in 1935-36 as well as 1936-37. He played his final game for the New York Rangers on March 19, 1939 against the Toronto Maple Leafs.
On May 17, 1939, Dillon was sold to the Detroit Red Wings by the New York Rangers. This would be his final year in the National Hockey League. He played a total of 44 games and scored seven goals and ten assists as a Red Wing. After the Red Wings, Dillon played another two years in the American Hockey League before retiring altogether. In 1940 he played 49 games split between the Indianapolis Capitals and Providence Reds, and then 51 games with the Pittsburgh Hornets in 1941-42, scoring 13 goals along with 23 assists.
Post-hockey career
Going into retirement at the age of 34, Dillon moved back to Thornbury, later moving to Meaford, Ontario. He worked with a telephone company until his death in 1969 at the age of 61.
Personal life
He was married to Bessie Marion Dillion with whom he had one child, Garry Matthew Dillon, born on September 25, 1937. Garry died in a car crash on May 19, 1953 at the age of 16, when a friend lost control of their truck on a bridge. Bessie died in 2003 at the age of 94. All three are buried in Thornbury-Clarksburg Union Cemetery.
Legacy
1936 through 1938 he led the Rangers in scoring three consecutive years, joining an exclusive club including players like Frank Boucher, Bill Cook, Andy Bathgate, Phil Esposito and Wayne Gretzky as the only players to do so.
Lester Patrick, the New York Rangers' coach, said that Dillon was "the perfect hockey player". A full-page spread of Dillon ran in the Montreal Gazette in 1933 outlining his talents. Patrick gave him accolades for having minimal penalties and a "deadly close range shot"
In the 2009 book 100 Ranger Greats, was ranked No. 33 all-time of the 901 New York Rangers who had played during the team's first 82 seasons
