O'Fallon, Illinois to St. Louis: Road Trip Guide & Distance

How far is O'Fallon, Illinois from St. Louis?

The distance from O'Fallon, Illinois to St. Louis is 15.7 miles (25.3 km) as the crow flies. St. Louis is located W of O'Fallon, Illinois. By car, the driving distance is approximately 20.4 miles, taking about 25min. A direct flight would take roughly 32min. Both are located in United States — O'Fallon, Illinois in Illinois and St. Louis in Missouri.

This is a very short trip, perfect for a quick morning drive or an easy commute. 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. Given the short distance, driving or taking a train is often faster and more convenient than dealing with airport security and flight boarding times.

Coordinates come from public place data for O'Fallon, Illinois and St. Louis. 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.