There are
1,034 mi
from Dekalb, IL to Conroe, TX
That's the driving distance. It would take 19 hours 7 mins to go from Dekalb, Illinois to Conroe, Texas.
The flight distance (direct flight from Dekalb, IL to Conroe, TX) is 884.92 mi.
1,034 mi = 1,663.61 kms