There are
906 mi
from Thornton, CO to Mendota Heights, MN
That's the driving distance. It would take 15 hours 50 mins to go from Thornton, Colorado to Mendota Heights, Minnesota.
The flight distance (direct flight from Thornton, CO to Mendota Heights, MN) is 695.36 mi.
906 mi = 1,457.89 kms