It matters where the geomagnetic pole is, and they are very different things. The auroras are ovals centered around the geomagnetic poles.

Currently the north magnetic pole is at 85.0N 132.6W while the north geomagnetic pole is at 80.0N 72.2W, which is about 500 miles, 800 km, take your pick. For those who are curious, the north magnetic pole has shifted about 15 degrees north in the last century, whereas the geomagnetic pole only moved about a tenth of that. They are often a thousand or more miles apart.

How far away you can see them depends on a number of factors, not least of which is your own altitude. Loosely speaking, you can see double the distance at quadruple the height. 1000 feet, 40 miles, 4000 feet, 80 miles, 9000 feet, 120 miles, 30000 feet (jet), 200 miles, etc. The aurora takes place about 50 miles up. So basically 600 miles away from the edge of the oval, depending on lighting. The size of the oval, it's intensity, etc depend on numerous factors, but it can be seen, on rare occassions (decades) in both the souther US and southern Europe. THe oval in the animation is visible as a green band, this is the southern version, so you will see australia rotate up if the aids perspective.


The link below shows this more clearly