There are
3,044 mi
from San Mateo, CA to Keene, NH
That's the driving distance. It would take 2 days 6 hours to go from San Mateo, California to Keene, New Hampshire.
The flight distance (direct flight from San Mateo, CA to Keene, NH) is 2,626.08 mi.
3,044 mi = 4.83 kms