There are
1,404 mi
from Thornton, CO to Steubenville, OH
That's the driving distance. It would take 1 day 1 hour to go from Thornton, Colorado to Steubenville, Ohio.
The flight distance (direct flight from Thornton, CO to Steubenville, OH) is 1,282.33 mi.
1,404 mi = 1.61 kms