There are
1,390 mi
from Passaic, NJ to Watertown, SD
That's the driving distance. It would take 1 day 2 hours to go from Passaic, New Jersey to Watertown, South Dakota.
The flight distance (direct flight from Passaic, NJ to Watertown, SD) is 1,192.52 mi.
1,390 mi = 2,236.42 kms