There are
1,335 mi
from Sioux City, IA to Westbury, NY
That's the driving distance. It would take 1 day to go from Sioux City, Iowa to Westbury, New York.
The flight distance (direct flight from Sioux City, IA to Westbury, NY) is 1,180.73 mi.
1,335 mi = 1.61 kms