There are
856 mi
from Thornton, CO to Otsego, MN
That's the driving distance. It would take 16 hours 20 mins to go from Thornton, Colorado to Otsego, Minnesota.
The flight distance (direct flight from Thornton, CO to Otsego, MN) is 688.10 mi.
856 mi = 1,377.82 kms