There are
2,184 mi
from San Mateo, CA to Danville, IL
That's the driving distance. It would take 1 day 13 hours to go from San Mateo, California to Danville, Illinois.
The flight distance (direct flight from San Mateo, CA to Danville, IL) is 1,863.64 mi.
2,184 mi = 3.22 kms