There are
2,957 mi
from Pleasanton, CA to Danbury, CT
That's the driving distance. It would take 2 days 4 hours to go from Pleasanton, California to Danbury, Connecticut.
The flight distance (direct flight from Pleasanton, CA to Danbury, CT) is 2,559.73 mi.
2,957 mi = 4,758.59 kms