There are
2,700 mi
from Simi Valley, CA to Hyattsville, MD
That's the driving distance. It would take 2 days to go from Simi Valley, California to Hyattsville, Maryland.
The flight distance (direct flight from Simi Valley, CA to Hyattsville, MD) is 2,322.22 mi.
2,700 mi = 3.22 kms