There are
843 mi
from Waterloo, IA to Kilgore, TX
That's the driving distance. It would take 15 hours 59 mins to go from Waterloo, Iowa to Kilgore, Texas.
The flight distance (direct flight from Waterloo, IA to Kilgore, TX) is 711.88 mi.
843 mi = 1,356.14 kms