There are
1,498 mi
from Nashua, NH to Slidell, LA
That's the driving distance. It would take 1 day 4 hours to go from Nashua, New Hampshire to Slidell, Louisiana.
The flight distance (direct flight from Nashua, NH to Slidell, LA) is 1,328.46 mi.
1,498 mi = 1.61 kms