Regular season and playoffs
| Year | Team | Games | Att | Cmp | Cmp% | Pass Yds | Pass TD | INT | Sacks | Y/A | Rating |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1976 | DAL | 15 | 20 | 13 | 65.0 | 213 | 2 | 2 | 1 | 10.6 | 94.4 |
| 1977 | DAL | 17 | 13 | 5 | 38.5 | 40 | 0 | 1 | 2 | 3.1 | 14.9 |
| 1978 | DAL | 19 | 54 | 30 | 55.6 | 342 | 1 | 2 | 2 | 6.3 | 65.5 |
| 1979 | DAL | 17 | 39 | 19 | 48.7 | 267 | 1 | 2 | 4 | 6.8 | 58.4 |
| 1980 | DAL | 19 | 531 | 309 | 58.2 | 3926 | 34 | 30 | 32 | 7.4 | 79.2 |
| 1981 | DAL | 18 | 441 | 254 | 57.6 | 3414 | 25 | 14 | 35 | 7.7 | 88.0 |
| 1982 | DAL | 12 | 343 | 215 | 62.7 | 2729 | 19 | 15 | 32 | 8.0 | 87.7 |
| 1983 | DAL | 17 | 586 | 366 | 62.5 | 4310 | 31 | 26 | 40 | 7.4 | 83.9 |
| 1984 | DAL | 14 | 233 | 126 | 54.1 | 1580 | 11 | 11 | 22 | 6.8 | 71.5 |
| 1985 | DAL | 15 | 493 | 291 | 59.0 | 3374 | 21 | 20 | 35 | 6.8 | 77.1 |
| 1986 | DAL | 7 | 153 | 95 | 62.1 | 1157 | 12 | 5 | 10 | 7.6 | 97.9 |
| 1987 | DAL | 11 | 362 | 215 | 59.4 | 2617 | 12 | 17 | 44 | 7.2 | 73.2 |
| 1988 | DAL | 3 | 42 | 29 | 69.0 | 274 | 1 | 3 | 5 | 6.5 | 65.0 |