There are
2,145 mi
from San Mateo, CA to Kankakee, IL
That's the driving distance. It would take 1 day 13 hours to go from San Mateo, California to Kankakee, Illinois.
The flight distance (direct flight from San Mateo, CA to Kankakee, IL) is 1,845.80 mi.
2,145 mi = 3.22 kms