There are
940 mi
from San Mateo, CA to Gallup, NM
That's the driving distance. It would take 17 hours 6 mins to go from San Mateo, California to Gallup, New Mexico.
The flight distance (direct flight from San Mateo, CA to Gallup, NM) is 766.25 mi.
940 mi = 1,512.99 kms