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

How far is Marion, Illinois from O'Fallon, Missouri?

The distance from Marion, Illinois to O'Fallon, Missouri is 121.5 miles (195.5 km) as the crow flies. O'Fallon, Missouri is located NW of Marion, Illinois. By car, the driving distance is approximately 151.9 miles, taking about 3h 3min. A direct flight would take roughly 45min. Both are located in United States — Marion, Illinois in Illinois and O'Fallon, Missouri in Missouri.

For a drive of this length, it's recommended to plan at least one quick rest stop to stretch your legs and grab a coffee. 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 Marion, Illinois and O'Fallon, Missouri. 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.