Flight Time from Chicago to O'Fallon
The flight from Chicago to O'Fallon covers about 264 mi and takes roughly 59 min nonstop. Flight duration estimate and fare guide.
Chicago and O'Fallon are about 264 mi (425 km) apart in a straight line. By road that works out to roughly 323 mi (519 km), a drive of about 5 hr 46 min. A nonstop flight covers the great-circle distance in approximately 59 min.
| Straight-line distance | 264 mi / 425 km |
| Road distance (est.) | 323 mi / 519 km |
| Driving time (est.) | 5 hr 46 min |
| Nonstop flight (est.) | 59 min |
| Driving fuel (est., 1-way) | $40 |
| Typical flight fare | $80–$250 |
| Geographic midpoint | 40.340, -89.209 |
How these estimates work
Straight-line distance uses the haversine formula on each city's coordinates. Road distance applies a circuity factor (~1.2–1.4×) and driving time a blended average speed. Flight time uses typical jet cruise speed plus ~30 minutes for taxi, climb and descent. Treat all figures as planning estimates.
Frequently asked questions
Chicago to O'Fallon is about 264 mi (425 km) in a straight line, and roughly 323 mi (519 km) by road.