There are
2,487 mi
from Irvine, CA to Johnstown, PA
That's the driving distance. It would take 1 day 20 hours to go from Irvine, California to Johnstown, Pennsylvania.
The flight distance (direct flight from Irvine, CA to Johnstown, PA) is 2,175.25 mi.
2,487 mi = 3.22 kms