City comparison
Kansas City, MO is about 200 miles (325 km) from O'Fallon, MO in a straight line. By road, the drive is roughly 250 miles, or about 4 h 15 min behind the wheel at highway speeds.
Driving distance is a rough estimate (great-circle × 1.25); driving time assumes a 60 mph blended average. Real trips run 10–20% longer with stops.
A direct flight from Kansas City, MO to O'Fallon, MO takes about 25 min, covering roughly 200 miles in a straight line. Connecting itineraries with a layover typically add 1–3 hours.
Block-to-block estimate at ~500 mph cruise, including taxi, climb, and descent — what an airline would publish, not pure airborne time.
Kansas City has a population of 505,958, vs 91,825 in O'Fallon — about 5.5× larger by population. By land area, Kansas City covers about 315 sq mi vs 31 sq mi for O'Fallon.
Population from US Census ACS. Land area from the Census Gazetteer (city proper, excluding inland water).
Cost indices by category, with the US city average (100) marked.
Index: 100 = US city average. Lower is more affordable.
Side-by-side costs, salaries, and sub-category indices.
| Metric | Kansas City | O'Fallon | Difference |
|---|---|---|---|
| Median rent | $1,131/mo | $1,311/mo | 15.9% higher in O'Fallon |
| Median home value | $208,900 | $283,600 | 35.8% higher in O'Fallon |
| Median household income | $65,256 | $104,863 | 60.7% higher in O'Fallon |
| Groceries index | 94.3 | 99.7 | 5.7% higher in O'Fallon |
| Utilities index | 89.3 | 71.9 | 24.2% higher in Kansas City |
| Transportation index | 93.7 | 98.5 | 5.1% higher in O'Fallon |
| Healthcare index | 93.9 | 98.7 | 5.1% higher in O'Fallon |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in Kansas City, you'd need $98,321 in O'Fallon to maintain your standard of living.
Climate, safety, and demographics side by side.
O'Fallon, MO is about 1.7% cheaper overall than Kansas City, MO, based on our cost-of-living index. Housing costs are roughly 7% higher in Kansas City than in O'Fallon. If you earn $80,000 in Kansas City, you'd need about $78,657 in O'Fallon to keep the same standard of living.