Your total trip with all stops is around 750 miles / 1200 km, taking roughly 11 hours for the whole trip. If you want to see every small town along the way, you can get a full list of cities between SLC and GEG.
Start from Salt Lake City International Airport.
Idaho Falls, Idaho is stopping point #1 after driving about 220 miles (350 km) or 3 hours.
Butte, Montana is stopping point #2 after driving about 210 miles (340 km) or 3 hours. Your total trip so far is about 430 miles or 690 km over roughly 6 hours of driving.
Missoula, Montana is stopping point #3 after driving about 120 miles (190 km) or 2 hours. Your total trip so far is about 540 miles or 880 km over roughly 8 hours of driving.
Finally, Spokane International Airport is your destination after driving about 200 miles (330 km) or 3 hours. Your total trip with all stops is around 750 miles or 1200 km, taking roughly 11 hours for the whole trip.
Travelmath helps you figure out where to stop when planning a long road trip from one location to another. The best stopping point for an overnight hotel stay or a break from driving often depends on how far or how long you want to drive before pausing to rest. You can find the closest city to your stopping point to look for hotels, or explore other cities and towns along the route. Use this as a road trip planner when you're driving cross-country or mapping a route with multiple stops.