Regular season
| Year | Team | Games | Att | Cmp | Cmp% | Pass Yds | Pass TD | INT | Sacks | Y/A | Rating |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1980 | KC | 3 | 69 | 37 | 53.6 | 542 | 5 | 2 | 5 | 7.9 | 91.6 |
| 1981 | KC | 13 | 274 | 147 | 53.6 | 1983 | 9 | 16 | 20 | 7.2 | 63.6 |
| 1982 | KC | 7 | 169 | 95 | 56.2 | 1192 | 7 | 6 | 23 | 7.1 | 77.3 |
| 1983 | KC | 16 | 603 | 346 | 57.4 | 4348 | 24 | 18 | 41 | 7.2 | 80.8 |
| 1984 | KC | 9 | 282 | 151 | 53.5 | 2098 | 15 | 10 | 18 | 7.4 | 80.7 |
| 1985 | KC | 16 | 338 | 181 | 53.6 | 2536 | 17 | 9 | 28 | 7.5 | 83.6 |
| 1986 | KC | 15 | 308 | 161 | 52.3 | 1922 | 13 | 11 | 25 | 6.2 | 70.8 |
| 1987 | KC | 11 | 273 | 154 | 56.4 | 2107 | 15 | 9 | 22 | 7.7 | 85.8 |
| 1988 | KC | 16 | 114 | 58 | 50.9 | 549 | 0 | 5 | 13 | 4.8 | 46.3 |