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

How far is Chattanooga from O'Fallon, Illinois?

The distance from Chattanooga to O'Fallon, Illinois is 353.2 miles (568.4 km) as the crow flies. O'Fallon, Illinois is located NW of Chattanooga. By car, the driving distance is approximately 423.8 miles, taking about 8h 32min. A direct flight would take roughly 1h 13min. Both are located in United States — Chattanooga in Tennessee 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. 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.

Coordinates come from public place data for Chattanooga 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.