Miles between Great Falls, MT and Boise, ID

There are
639 mi
from Great Falls, MT to Boise, ID

That's the driving distance. It would take 10 hours 15 mins to go from Great Falls, Montana to Boise, Idaho.

The flight distance (direct flight from Great Falls, MT to Boise, ID) is 359.23 mi.

639 mi = 1,028.53 kms