There are
1,088 mi
from Thornton, CO to Beech Grove, IN
That's the driving distance. It would take 19 hours 26 mins to go from Thornton, Colorado to Beech Grove, Indiana.
The flight distance (direct flight from Thornton, CO to Beech Grove, IN) is 1,000.57 mi.
1,088 mi = 1.61 kms