There are
3,127 mi
from Waltham, MA to Menlo Park, CA
That's the driving distance. It would take 2 days 7 hours to go from Waltham, Massachusetts to Menlo Park, California.
The flight distance (direct flight from Waltham, MA to Menlo Park, CA) is 2,680.70 mi.
3,127 mi = 5,031.97 kms