There are
2,681 mi
from Redwood City, CA to St Marys, PA
That's the driving distance. It would take 1 day 23 hours to go from Redwood City, California to St Marys, Pennsylvania.
The flight distance (direct flight from Redwood City, CA to St Marys, PA) is 2,321.90 mi.
2,681 mi = 4,314.90 kms