What Is the Distance from Chicago to St. Louis in SI Units?

The driving distance from Chicago, IL to St. Louis, MO is approximately 298 miles (479 km) via I-55 S.

In SI units:

• 479,000 meters (4.79 × 10⁵ m)
• 479 kilometers (km)

Calculation: 298 mi × 1,609.344 m/mi = 479,584 m ≈ 479.6 km.

Travel time: ~4.5–5 hours driving (traffic-dependent). Flight: ~1 hr 15 min + airport time. Train (Amtrak): ~5.5 hrs.