How far is it from St. Peters, MO to O'Fallon, MO?

The distance between St. Peters, MO and O'Fallon, MO is 8 mi by road.

How long does it take to drive from St. Peters, MO to O'Fallon, MO?

The drive from St. Peters, MO to O'Fallon, MO takes approximately 20 min by car.

The fastest route from St. Peters, MO to O'Fallon, MO covers 8 mi with a driving time of approximately 20 min.

O'Fallon, MO lies roughly to the west of St. Peters, MO.

Distance: 8 miDuration: 20 min

Driving from St. Peters, MO to O'Fallon, MO takes about 20 min via Mexico Road. The distance is 8 mi. The straight-line distance is 7 mi. Driving directions

Driving directions6 · 8 mi

The return trip from O'Fallon, MO to St. Peters, MO covers roughly the same distance, 8 mi.

No notable attractions were found along this route.

Distance and drive time are computed from OpenStreetMap road data with the OSRM routing engine. Updated 4 September 2026.

How far is it from St. Peters, MO to O'Fallon, MO?: The distance between St. Peters, MO and O'Fallon, MO is 8 mi by road.
How long does it take to drive from St. Peters, MO to O'Fallon, MO?: The drive from St. Peters, MO to O'Fallon, MO takes approximately 20 min by car.
What is the best route from St. Peters, MO to O'Fallon, MO?: The fastest route from St. Peters, MO to O'Fallon, MO covers 8 mi with a driving time of approximately 20 min.
Which direction is O'Fallon, MO from St. Peters, MO?: O'Fallon, MO lies roughly to the west of St. Peters, MO.