The drive from McCall to Billings is a 1,000-kilometer journey heading east. The most practical route is ID-55 to Boise, then I-84 East to I-90 East through Missoula and Bozeman. Expect a driving time of 11 to 12 hours. This route takes you through the heart of the Rocky Mountains.
Total Distance: 1,000 km driving distance, 750 km straight-line air distance.
Be prepared for mountain driving conditions.
Summer and early autumn for the best road conditions in the mountains.