2018 Illinois Fighting Illini Penalty Split Stats through 01/07/2019
| Split | G | Pen. | Yards | Pen./G | Yards/G |
|---|---|---|---|---|---|
| All Games | 12 | 77 | 773 | 6.4 | 64.4 |
| at Home | 6 | 45 | 446 | 7.5 | 74.3 |
| on Road/Neutral Site | 6 | 32 | 327 | 5.3 | 54.5 |
| in Wins | 4 | 31 | 320 | 7.8 | 80.0 |
| in Losses | 8 | 46 | 453 | 5.8 | 56.6 |
| vs. Conference | 9 | 54 | 538 | 6.0 | 59.8 |
| vs. Non-Conference | 3 | 23 | 235 | 7.7 | 78.3 |
| vs. Ranked (AP) | 3 | 21 | 215 | 7.0 | 71.7 |
| vs. Unranked (AP) | 9 | 56 | 558 | 6.2 | 62.0 |
| vs. FBS (I-A) | 11 | 63 | 628 | 5.7 | 57.1 |
| vs. FCS (I-AA) | 1 | 14 | 145 | 14.0 | 145.0 |
| vs. FBS Winning | 6 | 37 | 375 | 6.2 | 62.5 |
| vs. FBS Non-Winning | 5 | 26 | 253 | 5.2 | 50.6 |
| vs. FBS Power 5 | 9 | 54 | 538 | 6.0 | 59.8 |
| vs. FBS non-Power 5 | 2 | 9 | 90 | 4.5 | 45.0 |
| in August/September | 4 | 30 | 316 | 7.5 | 79.0 |
| in October | 4 | 19 | 187 | 4.8 | 46.8 |
| in November | 4 | 28 | 270 | 7.0 | 67.5 |
| in December/January | 0 | 0 | 0 | - | - |