Flight International Airport departs from San Francisco International Airport at 21:30 and arrives at Missoula Missoula Montana Airport at 15:19.The flight has a short stop at Seattle.
The flighttime is about 14h 49m. The distance travelled ("as the bird flies"): 1040 Km. So the average speed is roughly 70 Km.
There is an 3 hour time difference between San Francisco and Missoula