There are
2,534 mi
from Youngstown, OH to San Mateo, CA
That's the driving distance. It would take 1 day 20 hours to go from Youngstown, Ohio to San Mateo, California.
The flight distance (direct flight from Youngstown, OH to San Mateo, CA) is 2,219.43 mi.
2,534 mi = 3.22 kms