There are
2,976 mi
from Waltham, MA to San Gabriel, CA
That's the driving distance. It would take 2 days 5 hours to go from Waltham, Massachusetts to San Gabriel, California.
The flight distance (direct flight from Waltham, MA to San Gabriel, CA) is 2,573.41 mi.
2,976 mi = 4,790.18 kms