There are
2,838 mi
from Simi Valley, CA to Westbury, NY
That's the driving distance. It would take 2 days 2 hours to go from Simi Valley, California to Westbury, New York.
The flight distance (direct flight from Simi Valley, CA to Westbury, NY) is 2,489.14 mi.
2,838 mi = 3.22 kms