1,855.39 kilometres (1,152.89 miles)
I have been looking in my Rand McNally atlas, and it's about 60 miles to Port Huron and 75 miles to the Detroit airport. Roughly 135 miles in total. Then, I decided to go to MSN maps, and I found it...
It is 1,033.23 miles according to MapQuest.
1,839.19 miles (2,959.88 kilometres)
Changed based on post by Crash Override in Discuss:How far is it from Detroit to. To where? Please finish the question so that we may answer it.