There are
1,904 mi
from Irvine, CA to Picayune, MS
That's the driving distance. It would take 1 day 9 hours to go from Irvine, California to Picayune, Mississippi.
The flight distance (direct flight from Irvine, CA to Picayune, MS) is 1,654.78 mi.
1,904 mi = 3,064.30 kms