If you head east from Denali, all the way through the Yukon (another good aurora-viewing region, by the way), you'll find yourself in Canada's Northwest Territories (NWT). You'd have a good chance of seeing the aurora borealis at any point on this journey. But if you go straight to Yellowknife, just south of the Arctic Circle, you may increase your chances a bit.
The town of Yellowknife in Canada's Northwest Territories offers exceptional viewing for several reasons. There are the typical ones -- location in the auroral zone, extended darkness for most of the year -- but Yellowknife is also far enough from the nearest mountains to offer not only less-obstructed views but also a more stable climate, with skies that tend to be clearer than in other areas of the NWT [source: Aurora Village].
Next, to Scandinavia.