There are
2,717 mi
from Walnut Creek, CA to Williamsport, PA
That's the driving distance. It would take 1 day 23 hours to go from Walnut Creek, California to Williamsport, Pennsylvania.
The flight distance (direct flight from Walnut Creek, CA to Williamsport, PA) is 2,384.14 mi.
2,717 mi = 4,372.17 kms