There are
2,935 mi
from Walnut Creek, CA to Danbury, CT
That's the driving distance. It would take 2 days 3 hours to go from Walnut Creek, California to Danbury, Connecticut.
The flight distance (direct flight from Walnut Creek, CA to Danbury, CT) is 2,563.30 mi.
2,935 mi = 4,723.70 kms