Miles between San Marcos, CA and Portsmouth, NH

There are
3,075 mi
from San Marcos, CA to Portsmouth, NH

That's the driving distance. It would take 2 days 7 hours to go from San Marcos, California to Portsmouth, New Hampshire.

The flight distance (direct flight from San Marcos, CA to Portsmouth, NH) is 2,579.27 mi.

3,075 mi = 4.83 kms