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

How far is O'Fallon, Illinois from Saint Peters, Missouri?

The distance from O'Fallon, Illinois to Saint Peters, Missouri is 41.1 miles (66.2 km) as the crow flies. Saint Peters, Missouri is located WNW of O'Fallon, Illinois. By car, the driving distance is approximately 53.5 miles, taking about 1h 5min. A direct flight would take roughly 35min. Both are located in United States — O'Fallon, Illinois in Illinois and Saint Peters, Missouri in Missouri.

This is a quick and easy drive, perfect for a day trip or weekend getaway. You can easily make the round trip in a single day. 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 Saint Peters, 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.