There are
1,412 mi
from Brownsville, TX to Dekalb, IL
That's the driving distance. It would take 1 day 2 hours to go from Brownsville, Texas to Dekalb, Illinois.
The flight distance (direct flight from Brownsville, TX to Dekalb, IL) is 1,214.03 mi.
1,412 mi = 1.61 kms