| 1919-20 | Joined Kent League |
| 1920-21 | Joined Southern League, English Section |
| 1921-22 | Elected to Football League Division Three South |
| 1928-29 | Football League Division Three South Champions, on goal average |
|
| Promoted to Division Two |
| 1933 | Relegated to Division Three South |
| 1934-35 | Football League Division Three South Champions |
|
| Promoted to Division Two |
| 1935-36 | Football League Division Two runner-up |
|
| Promoted to Division One |
| 1936-37 | Football League runner-up |
| 1939-40 | Football League programme abandoned due to outbreak of war |
| 1945-46 | F.A. Cup runner-up |
| 1946-47 | F.A. Cup Winners |
| 1957 | Relegated to Division Two |
| 1963 | Escaped relegation to Division Three on goal average |
| 1971 | Relegated to Division Three |
| 1974-75 | Promoted to Division Two |
| 1980 | Relegated to Division Three |
| 1980-81 | Missed runner-up spot on goal difference |
|
| Promoted to Division Two |
| 1985-86 | Football League Division Two runner-up |
|
| Promoted to Division One |
| 1986-87 | Maintained status after play-offs (SF - Ipswich Town 0 Charlton |
|
| Athletic 0, Charlton Athletic 2 Ipswich Town 1 - Agg 2-1, F |
|
| Charlton Athletic 1 Leeds United 0, Leeds United 1 Charlton |
|
| Athletic 0 - Agg 1-1, Replay Leeds United 1 Charlton Ath. 2) |
| 1987 | Escaped relegation play-off on goal difference |
| 1990 | Relegated to Division Two |
| 1992-93 | Division Two re-designated Division One on formation of F.A. |
|
| Premiership |
| 1995-96 | Not promoted after play-offs (SF Charlton Athletic 1 Crystal |
|
| Palace 2, Crystal Palace 1 Charlton Athletic 0 - Agg 1-3) |
| 1997-98 | Promoted to F.A. Premiership after play-offs (SF Ipswich Town 0 |
|
| Charlton Athletic 1, Chartlton Athletic 1 Ipswich Town 0 - Agg |
|
| 2-0), F Charlton Athletic 4 Sunderland 4 @ Wembley, Charlton |
|
| Athletic won 7-6 on penalties) |
| 1999 | Relegated to Football League Division One |
| 1999-00 | Football League Champions |
|
| Promoted to F.A. Premiership |
