Mammoth Cave to O'Fallon, Missouri: Road Trip Guide & Distance

How far is Mammoth Cave from O'Fallon, Missouri?

The distance from Mammoth Cave to O'Fallon, Missouri is 274.4 miles (441.6 km) as the crow flies. O'Fallon, Missouri is located WNW of Mammoth Cave. By car, the driving distance is approximately 343 miles, taking about 6h 54min. A direct flight would take roughly 1h 3min. Both are located in United States — Mammoth Cave in Kentucky 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.

Coordinates come from public place data for Mammoth Cave 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.