There are
1,232 mi
from Great Falls, MT to Yucaipa, CA
That's the driving distance. It would take 20 hours 42 mins to go from Great Falls, Montana to Yucaipa, California.
The flight distance (direct flight from Great Falls, MT to Yucaipa, CA) is 977.06 mi.
1,232 mi = 1,982.76 kms