There are
2,119 mi
from Elgin, IL to San Mateo, CA
That's the driving distance. It would take 1 day 12 hours to go from Elgin, Illinois to San Mateo, California.
The flight distance (direct flight from Elgin, IL to San Mateo, CA) is 1,821.11 mi.
2,119 mi = 3.22 kms