O'Fallon, Missouri to West Yellowstone: Road Trip Guide & Distance

How far is O'Fallon, Missouri from West Yellowstone?

The distance from O'Fallon, Missouri to West Yellowstone is 1123.3 miles (1807.7 km) as the crow flies. West Yellowstone is located WNW of O'Fallon, Missouri. By car, the driving distance is approximately 1347.9 miles, taking about 27h 7min. A direct flight would take roughly 2h 46min. Both are located in United States — O'Fallon, Missouri in Missouri and West Yellowstone in Montana.

This is a serious multi-day road trip! We strongly recommend breaking this journey up with an overnight stay to ensure you arrive safely and refreshed. Since you'll be heading mostly West, pack a good pair of sunglasses if you plan to drive during the late afternoon to avoid the harsh sun glare. For a trip of this distance, flying is significantly faster. However, driving offers the flexibility to explore stops along the way.

Coordinates come from public place data for O'Fallon, Missouri and West Yellowstone. The driving distance is estimated from straight-line distance with a road-factor model, so confirm the route in your navigation app. Fuel, flight, bus, and train values are planning estimates and can change by date, provider, road closures, and border rules.