There are
2,441 mi
from San Marcos, CA to Bethel Park, PA
That's the driving distance. It would take 1 day 19 hours to go from San Marcos, California to Bethel Park, Pennsylvania.
The flight distance (direct flight from San Marcos, CA to Bethel Park, PA) is 2,098.48 mi.
2,441 mi = 3.22 kms