There are
2,629 mi
from Antioch, CA to St Marys, PA
That's the driving distance. It would take 1 day 22 hours to go from Antioch, California to St Marys, Pennsylvania.
The flight distance (direct flight from Antioch, CA to St Marys, PA) is 2,287.43 mi.
2,629 mi = 4,230.54 kms