There are
2,963 mi
from Waltham, MA to Walnut, CA
That's the driving distance. It would take 2 days 5 hours to go from Waltham, Massachusetts to Walnut, California.
The flight distance (direct flight from Waltham, MA to Walnut, CA) is 2,563.51 mi.
2,963 mi = 4,768.39 kms