There are
1,733 mi
from Redwood City, CA to San Marcos, TX
That's the driving distance. It would take 1 day 6 hours to go from Redwood City, California to San Marcos, Texas.
The flight distance (direct flight from Redwood City, CA to San Marcos, TX) is 1,486.96 mi.
1,733 mi = 2,789.40 kms