There are
1,101 mi
from Irvine, CA to Butte, MT
That's the driving distance. It would take 18 hours 38 mins to go from Irvine, California to Butte, Montana.
The flight distance (direct flight from Irvine, CA to Butte, MT) is 895.26 mi.
1,101 mi = 1.61 kms