There are
2,958 mi
from Hempstead, NY to Lompoc, CA
That's the driving distance. It would take 2 days 5 hours to go from Hempstead, New York to Lompoc, California.
The flight distance (direct flight from Hempstead, NY to Lompoc, CA) is 2,564.96 mi.
2,958 mi = 4,760.27 kms