Regular season
| Year | Team | Games | Att | Cmp | Cmp% | Pass Yds | Pass TD | INT | Sacks | Y/A | Rating |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1971 | NE | 14 | 328 | 158 | 48.2 | 2158 | 19 | 16 | 36 | 6.6 | 68.6 |
| 1972 | NE | 14 | 355 | 169 | 47.6 | 2196 | 8 | 25 | 39 | 6.2 | 45.7 |
| 1973 | NE | 14 | 376 | 193 | 51.3 | 2550 | 13 | 17 | 37 | 6.8 | 65.8 |
| 1974 | NE | 14 | 352 | 173 | 49.1 | 2457 | 19 | 22 | 21 | 7.0 | 64.1 |
| 1975 | NE | 5 | 92 | 36 | 39.1 | 571 | 3 | 7 | 13 | 6.2 | 39.7 |
| 1976 | SF | 12 | 243 | 126 | 51.9 | 1592 | 13 | 16 | 26 | 6.6 | 63.0 |
| 1977 | SF | 14 | 248 | 128 | 51.6 | 1693 | 9 | 14 | 30 | 6.8 | 62.1 |
| 1979 | LV | 4 | 15 | 7 | 46.7 | 89 | 1 | 1 | 2 | 5.9 | 60.1 |
| 1980 | LV | 13 | 320 | 165 | 51.6 | 2299 | 18 | 16 | 36 | 7.2 | 72.9 |
| 1981 | LV | 9 | 179 | 94 | 52.5 | 1045 | 4 | 9 | 22 | 5.8 | 56.7 |
| 1982 | LV | 9 | 261 | 152 | 58.2 | 2035 | 14 | 15 | 23 | 7.8 | 77.0 |
| 1983 | LV | 14 | 379 | 230 | 60.7 | 2935 | 20 | 18 | 42 | 7.7 | 82.7 |
| 1984 | LV | 8 | 198 | 108 | 54.5 | 1473 | 6 | 10 | 13 | 7.4 | 67.6 |
| 1985 | LV | 3 | 103 | 71 | 68.9 | 803 | 3 | 3 | 13 | 7.8 | 89.6 |
| 1986 | LV | 10 | 252 | 133 | 52.8 | 1986 | 14 | 9 | 27 | 7.9 | 82.5 |