Your total trip with all stops is around 770 miles / 1240 km, taking roughly 12 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 Helena, MT and Eugene, OR.
Start from Helena, Montana.
Spokane, Washington is stopping point #1 after driving about 310 miles (500 km) or 5 hours.
Portland, Oregon is stopping point #2 after driving about 350 miles (560 km) or 5.5 hours. Your total trip so far is about 660 miles or 1060 km over roughly 10.5 hours of driving.
Finally, Eugene, Oregon is your destination after driving about 110 miles (180 km) or 2 hours. Your total trip with all stops is around 770 miles or 1240 km, taking roughly 12 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.