There are
2,118 mi
from San Mateo, CA to South Elgin, IL
That's the driving distance. It would take 1 day 12 hours to go from San Mateo, California to South Elgin, Illinois.
The flight distance (direct flight from San Mateo, CA to South Elgin, IL) is 1,820.63 mi.
2,118 mi = 3.22 kms