There are
2,852 mi
from Walnut Creek, CA to Middletown, DE
That's the driving distance. It would take 2 days 2 hours to go from Walnut Creek, California to Middletown, Delaware.
The flight distance (direct flight from Walnut Creek, CA to Middletown, DE) is 2,474.46 mi.
2,852 mi = 4,589.23 kms