The road distance between Craters of the Moon National Monument & Preserve (Idaho) and Yellowstone National Park (Wyoming/Montana/Idaho) is approximately 1,295 miles (2,084 km).
Fly from Idaho Falls (IDA) to Jackson Hole (JAC) or West Yellowstone (WYS) — ~1 hr flight + rental car. Saves 15+ hours driving.
US-20 across Idaho (via Island Park) enters Yellowstone at West Entrance — shorter mileage (~450 mi) but slower mountain roads; ~9–10 hrs. Check seasonal closures (Teton Pass, Yellowstone roads).
Always verify current road conditions and park entrance status before departure.