Regular season and playoffs
| Year | Team | Games | Att | Cmp | Cmp% | Pass Yds | Pass TD | INT | Sacks | Y/A | Rating |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1969 | DAL | 7 | 52 | 27 | 51.9 | 465 | 2 | 2 | 12 | 8.9 | 79.4 |
| 1970 | DAL | 8 | 82 | 44 | 53.7 | 542 | 2 | 8 | 19 | 6.6 | 42.9 |
| 1971 | DAL | 16 | 262 | 157 | 59.9 | 2203 | 18 | 4 | 33 | 8.4 | 103.6 |
| 1972 | DAL | 6 | 60 | 30 | 50.0 | 370 | 2 | 2 | 15 | 6.2 | 66.7 |
| 1973 | DAL | 16 | 323 | 197 | 61.0 | 2697 | 25 | 21 | 53 | 8.3 | 86.4 |
| 1974 | DAL | 14 | 360 | 190 | 52.8 | 2552 | 11 | 15 | 45 | 7.1 | 68.4 |
| 1975 | DAL | 16 | 427 | 246 | 57.6 | 3336 | 24 | 20 | 48 | 7.8 | 81.9 |
| 1976 | DAL | 15 | 406 | 223 | 54.9 | 2865 | 14 | 14 | 33 | 7.1 | 74.4 |
| 1977 | DAL | 17 | 422 | 247 | 58.5 | 3102 | 21 | 11 | 39 | 7.4 | 87.2 |
| 1978 | DAL | 18 | 485 | 268 | 55.3 | 3649 | 30 | 19 | 40 | 7.5 | 83.8 |
| 1979 | DAL | 17 | 489 | 279 | 57.1 | 3710 | 28 | 12 | 37 | 7.6 | 90.1 |