Regular season and playoffs
| 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 | 16 | 343 | 163 | 47.5 | 2142 | 14 | 15 | 33 | 6.2 | 63.1 |
| 1973 | PIT | 11 | 205 | 101 | 49.3 | 1350 | 12 | 18 | 25 | 6.6 | 53.5 |
| 1974 | PIT | 11 | 198 | 96 | 48.5 | 1179 | 10 | 9 | 12 | 6.0 | 65.2 |
| 1975 | PIT | 17 | 343 | 197 | 57.4 | 2582 | 21 | 14 | 36 | 7.5 | 84.7 |
| 1976 | PIT | 12 | 245 | 120 | 49.0 | 1617 | 13 | 10 | 20 | 6.6 | 71.1 |
| 1977 | PIT | 15 | 351 | 181 | 51.6 | 2700 | 18 | 22 | 26 | 7.7 | 68.1 |
| 1978 | PIT | 19 | 446 | 251 | 56.3 | 3705 | 36 | 24 | 25 | 8.3 | 88.1 |
| 1979 | PIT | 19 | 554 | 312 | 56.3 | 4482 | 32 | 29 | 28 | 8.1 | 80.2 |
| 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 | 10 | 279 | 155 | 55.6 | 2093 | 19 | 13 | 18 | 7.5 | 82.9 |
| 1983 | PIT | 1 | 8 | 5 | 62.5 | 77 | 2 | 0 | 0 | 9.6 | 133.9 |