Miles between Thornton, CO and Duluth, MN

There are
1,059 mi
from Thornton, CO to Duluth, MN

That's the driving distance. It would take 18 hours 39 mins to go from Thornton, Colorado to Duluth, Minnesota.

The flight distance (direct flight from Thornton, CO to Duluth, MN) is 802.72 mi.

1,059 mi = 1.61 kms