Fort Smith to O'Fallon, Illinois: Road Trip Guide & Distance

How far is Fort Smith from O'Fallon, Illinois?

The distance from Fort Smith to O'Fallon, Illinois is 332.2 miles (534.6 km) as the crow flies. O'Fallon, Illinois is located NE of Fort Smith. By car, the driving distance is approximately 398.6 miles, taking about 8h 1min. A direct flight would take roughly 1h 10min. Both are located in United States — Fort Smith in Arkansas and O'Fallon, Illinois in Illinois.

This is a solid day of driving. Be sure to take breaks every 2-3 hours to avoid driver fatigue, and plan your meals ahead of time. Heading East means you'll be driving into the sunrise if you start early. Keep your windshield clean for the best visibility.

Coordinates come from public place data for Fort Smith and O'Fallon, Illinois. 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.