There are
1,835 mi
from Flower Mound, TX to Portsmouth, NH
That's the driving distance. It would take 1 day 10 hours to go from Flower Mound, Texas to Portsmouth, New Hampshire.
The flight distance (direct flight from Flower Mound, TX to Portsmouth, NH) is 1,583.47 mi.
1,835 mi = 1.61 kms