There are
3,091 mi
from Walnut Creek, CA to Somerville, MA
That's the driving distance. It would take 2 days 6 hours to go from Walnut Creek, California to Somerville, Massachusetts.
The flight distance (direct flight from Walnut Creek, CA to Somerville, MA) is 2,669.07 mi.
3,091 mi = 4,973.87 kms