There are
3,215 mi
from Waltham, MA to Arcata, CA
That's the driving distance. It would take 2 days 9 hours to go from Waltham, Massachusetts to Arcata, California.
The flight distance (direct flight from Waltham, MA to Arcata, CA) is 2,686.79 mi.
3,215 mi = 5,174.69 kms