There are
2,733 mi
from Summerville, SC to Walnut Creek, CA
That's the driving distance. It would take 2 days to go from Summerville, South Carolina to Walnut Creek, California.
The flight distance (direct flight from Summerville, SC to Walnut Creek, CA) is 2,361.54 mi.
2,733 mi = 4,398.54 kms