Ketteringham finished 22 of 31 for 286 yards. Skokna carried 11 times for 114 yards. Noah Wanzek had six receptions for 100 yards for the Fighting Hawks (7-4), who finished 6-0 at home this season.
Skokna's 28-yard run late in the third quarter helped North Dakota extend its 20-18 lead and his 34-yard run in the fourth capped the scoring. Brady Leach kicked three field goals for UND.
After falling behind 7-0, Southern Utah (3-9) took a 15-7 lead in the second quarter on a Thomas Duckett 1-yard run and an 18-yard Duckett TD catch from Chris Helbig. However, the Thunderbirds would only add Kekoa Sasaoka's 47-yard field goal in the third quarter.
Helbig completed 24 of 42 passes for 258 yards.
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