There are
2,570 mi
from Walnut Creek, CA to Plum, PA
That's the driving distance. It would take 1 day 20 hours to go from Walnut Creek, California to Plum, Pennsylvania.
The flight distance (direct flight from Walnut Creek, CA to Plum, PA) is 2,250.97 mi.
2,570 mi = 4,136.16 kms