There are
1,211 mi
from Irvine, CA to Missoula, MT
That's the driving distance. It would take 20 hours 24 mins to go from Irvine, California to Missoula, Montana.
The flight distance (direct flight from Irvine, CA to Missoula, MT) is 931.61 mi.
1,211 mi = 1.61 kms