There are
1,492 mi
from Boynton Beach, FL to Portsmouth, NH
That's the driving distance. It would take 1 day 4 hours to go from Boynton Beach, Florida to Portsmouth, New Hampshire.
The flight distance (direct flight from Boynton Beach, FL to Portsmouth, NH) is 1,257.26 mi.
1,492 mi = 1.61 kms