There are
1,813 mi
from Clayton, MO to Pasadena, CA
That's the driving distance. It would take 1 day 7 hours to go from Clayton, Missouri to Pasadena, California.
The flight distance (direct flight from Clayton, MO to Pasadena, CA) is 1,571.82 mi.
1,813 mi = 2,918.06 kms