Regular season
| Year | Team | Games | Att | Cmp | Cmp% | Pass Yds | Pass TD | INT | Sacks | Y/A | Rating |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1971 | HOU | 14 | 270 | 127 | 47.0 | 1702 | 7 | 21 | 20 | 6.3 | 43.8 |
| 1972 | HOU | 14 | 299 | 144 | 48.2 | 1711 | 7 | 12 | 37 | 5.7 | 57.1 |
| 1973 | HOU | 14 | 290 | 154 | 53.1 | 1482 | 5 | 17 | 30 | 5.1 | 49.0 |
| 1974 | HOU | 11 | 247 | 140 | 56.7 | 1571 | 10 | 10 | 23 | 6.4 | 72.4 |
| 1975 | HOU | 14 | 342 | 163 | 47.7 | 2053 | 14 | 16 | 24 | 6.0 | 61.0 |
| 1976 | HOU | 13 | 309 | 167 | 54.0 | 1795 | 10 | 10 | 24 | 5.8 | 68.6 |
| 1977 | HOU | 14 | 319 | 169 | 53.0 | 1987 | 13 | 18 | 20 | 6.2 | 62.3 |
| 1978 | HOU | 16 | 368 | 199 | 54.1 | 2473 | 16 | 17 | 15 | 6.7 | 70.4 |
| 1979 | HOU | 15 | 324 | 163 | 50.3 | 2090 | 14 | 18 | 29 | 6.5 | 62.1 |
| 1980 | LV | 5 | 130 | 66 | 50.8 | 932 | 5 | 8 | 10 | 7.2 | 61.4 |
| 1981 | LAR | 7 | 152 | 64 | 42.1 | 719 | 2 | 14 | 14 | 4.7 | 22.9 |
| 1983 | PHI | 3 | 5 | 0 | 0.0 | 0 | 0 | 0 | 0 | 0.0 | 39.6 |