There are
3,086 mi
from Walnut Creek, CA to Watertown, MA
That's the driving distance. It would take 2 days 6 hours to go from Walnut Creek, California to Watertown, Massachusetts.
The flight distance (direct flight from Walnut Creek, CA to Watertown, MA) is 2,665.11 mi.
3,086 mi = 4,966.12 kms