There are
3,103 mi
from Waltham, MA to San Leandro, CA
That's the driving distance. It would take 2 days 6 hours to go from Waltham, Massachusetts to San Leandro, California.
The flight distance (direct flight from Waltham, MA to San Leandro, CA) is 2,671.91 mi.
3,103 mi = 4,993.86 kms