There are
1,498 mi
from St Joseph, MO to Somersworth, NH
That's the driving distance. It would take 1 day 4 hours to go from St Joseph, Missouri to Somersworth, New Hampshire.
The flight distance (direct flight from St Joseph, MO to Somersworth, NH) is 1,259.10 mi.
1,498 mi = 1.61 kms