Regular season
| Year | Team | Games | Att | Cmp | Cmp% | Pass Yds | Pass TD | INT | Sacks | Y/A | Rating |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1970 | PIT | 13 | 218 | 83 | 38.1 | 1410 | 6 | 24 | 25 | 6.5 | 30.4 |
| 1971 | PIT | 14 | 373 | 203 | 54.4 | 2259 | 13 | 22 | 33 | 6.1 | 59.7 |
| 1972 | PIT | 14 | 308 | 147 | 47.7 | 1887 | 12 | 12 | 29 | 6.1 | 64.1 |
| 1973 | PIT | 10 | 180 | 89 | 49.4 | 1183 | 10 | 15 | 24 | 6.6 | 54.5 |
| 1974 | PIT | 8 | 148 | 67 | 45.3 | 785 | 7 | 8 | 10 | 5.3 | 55.2 |
| 1975 | PIT | 14 | 286 | 165 | 57.7 | 2055 | 18 | 9 | 31 | 7.2 | 88.0 |
| 1976 | PIT | 10 | 192 | 92 | 47.9 | 1177 | 10 | 9 | 16 | 6.1 | 65.4 |
| 1977 | PIT | 14 | 314 | 162 | 51.6 | 2523 | 17 | 19 | 26 | 8.0 | 71.4 |
| 1978 | PIT | 16 | 368 | 207 | 56.2 | 2915 | 28 | 20 | 21 | 7.9 | 84.7 |
| 1979 | PIT | 16 | 472 | 259 | 54.9 | 3724 | 26 | 25 | 24 | 7.9 | 77.0 |
| 1980 | PIT | 15 | 424 | 218 | 51.4 | 3339 | 24 | 22 | 33 | 7.9 | 75.0 |
| 1981 | PIT | 14 | 370 | 201 | 54.3 | 2887 | 22 | 14 | 17 | 7.8 | 83.9 |
| 1982 | PIT | 9 | 240 | 127 | 52.9 | 1768 | 17 | 11 | 18 | 7.4 | 81.4 |
| 1983 | PIT | 1 | 8 | 5 | 62.5 | 77 | 2 | 0 | 0 | 9.6 | 133.9 |