Dalton completed 27-of-38 passes with a pair of TD tosses to A.J. Green as the Bengals (10-5) first secured a post-season slot and later claimed the division crown when Baltimore lost to New England.
Mohamed Sanu and Jermaine Gresham caught one scoring strike each for Cincinnati.
The Vikings (4-10-1) fell despite the return of leading NFL rusher Adrian Peterson, who was held to 45 yards on 11 carries after missing last week's game due to a sore ankle.
Matt Cassel was intercepted three times, managing just 114 passing yards and a touchdown on 13-of-27 efficiency.