There are
2,129 mi
from Janesville, WI to San Mateo, CA
That's the driving distance. It would take 1 day 12 hours to go from Janesville, Wisconsin to San Mateo, California.
The flight distance (direct flight from Janesville, WI to San Mateo, CA) is 1,782.85 mi.
2,129 mi = 3,425.91 kms