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

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

The distance from Marion, Iowa to O'Fallon, Illinois is 253.8 miles (408.5 km) as the crow flies. O'Fallon, Illinois is located SSE of Marion, Iowa. By car, the driving distance is approximately 317.3 miles, taking about 6h 23min. A direct flight would take roughly 1h 1min. Both are located in United States — Marion, Iowa in Iowa and O'Fallon, Illinois in Illinois.

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. 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 Marion, Iowa 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.