There are
1,547 mi
from Pasadena, TX to Monrovia, CA
That's the driving distance. It would take 1 day 2 hours to go from Pasadena, Texas to Monrovia, California.
The flight distance (direct flight from Pasadena, TX to Monrovia, CA) is 1,368.55 mi.
1,547 mi = 1.61 kms