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

How far is O'Fallon, Illinois from Rapid City?

The distance from O'Fallon, Illinois to Rapid City is 786.8 miles (1266.3 km) as the crow flies. Rapid City is located WNW of O'Fallon, Illinois. By car, the driving distance is approximately 944.2 miles, taking about 19h 0min. A direct flight would take roughly 2h 5min. Both are located in United States — O'Fallon, Illinois in Illinois and Rapid City in South Dakota.

This is a serious multi-day road trip! We strongly recommend breaking this journey up with an overnight stay to ensure you arrive safely and refreshed. 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. For a trip of this distance, flying is significantly faster. However, driving offers the flexibility to explore stops along the way.

Coordinates come from public place data for O'Fallon, Illinois and Rapid City. 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.