There are
1,830 mi
from Irvine, CA to Florissant, MO
That's the driving distance. It would take 1 day 7 hours to go from Irvine, California to Florissant, Missouri.
The flight distance (direct flight from Irvine, CA to Florissant, MO) is 1,564.77 mi.
1,830 mi = 2,944.58 kms