There are
1,333 mi
from Thornton, CO to Warrensville Heights, OH
That's the driving distance. It would take 23 hours 51 mins to go from Thornton, Colorado to Warrensville Heights, Ohio.
The flight distance (direct flight from Thornton, CO to Warrensville Heights, OH) is 1,230.15 mi.
1,333 mi = 1.61 kms