There are
1,216 mi
from Missoula, MT to Temecula, CA
That's the driving distance. It would take 20 hours 25 mins to go from Missoula, Montana to Temecula, California.
The flight distance (direct flight from Missoula, MT to Temecula, CA) is 938 mi.
1,216 mi = 1.61 kms