There are
2,815 mi
from Hempstead, NY to Downey, CA
That's the driving distance. It would take 2 days 2 hours to go from Hempstead, New York to Downey, California.
The flight distance (direct flight from Hempstead, NY to Downey, CA) is 2,463.22 mi.
2,815 mi = 4,529.87 kms