Regular season
| Year | Team | Games | Att | Cmp | Cmp% | Pass Yds | Pass TD | INT | Sacks | Y/A | Rating |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1974 | WAS | 9 | 11 | 9 | 81.8 | 145 | 1 | 0 | 2 | 13.2 | 149.1 |
| 1975 | WAS | 14 | 22 | 10 | 45.5 | 96 | 1 | 3 | 2 | 4.4 | 33.7 |
| 1976 | WAS | 14 | 163 | 79 | 48.5 | 1036 | 8 | 10 | 22 | 6.4 | 59.8 |
| 1977 | WAS | 14 | 182 | 84 | 46.2 | 1097 | 7 | 9 | 30 | 6.0 | 57.9 |
| 1978 | WAS | 16 | 390 | 187 | 47.9 | 2593 | 13 | 18 | 42 | 6.6 | 61.6 |
| 1979 | WAS | 16 | 395 | 233 | 59.0 | 2797 | 20 | 13 | 34 | 7.1 | 83.9 |
| 1980 | WAS | 16 | 454 | 262 | 57.7 | 2962 | 17 | 16 | 31 | 6.5 | 75.2 |
| 1981 | WAS | 16 | 496 | 293 | 59.1 | 3568 | 19 | 20 | 28 | 7.2 | 77.3 |
| 1982 | WAS | 9 | 252 | 161 | 63.9 | 2033 | 13 | 9 | 30 | 8.1 | 91.3 |
| 1983 | WAS | 16 | 459 | 276 | 60.1 | 3714 | 29 | 11 | 34 | 8.1 | 97.0 |
| 1984 | WAS | 16 | 477 | 283 | 59.3 | 3391 | 24 | 13 | 48 | 7.1 | 86.6 |
| 1985 | WAS | 11 | 301 | 167 | 55.5 | 1774 | 8 | 16 | 37 | 5.9 | 59.6 |