There are
2,676 mi
from Sunnyvale, CA to Johnstown, PA
That's the driving distance. It would take 1 day 23 hours to go from Sunnyvale, California to Johnstown, Pennsylvania.
The flight distance (direct flight from Sunnyvale, CA to Johnstown, PA) is 2,306.08 mi.
2,676 mi = 4,306.32 kms