City comparison
O'Fallon, MO is about 175 miles (275 km) from Springfield, MO in a straight line. By road, the drive is roughly 225 miles, or about 3 h 45 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 O'Fallon, MO to Springfield, MO takes about 21 min, covering roughly 175 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.
Springfield has a population of 168,873, vs 91,825 in O'Fallon — about 1.8× larger by population. By land area, Springfield covers about 83 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 | O'Fallon | Springfield | Difference |
|---|---|---|---|
| Median rent | $1,311/mo | $878/mo | 49.3% higher in O'Fallon |
| Median home value | $283,600 | $146,400 | 93.7% higher in O'Fallon |
| Median household income | $104,863 | $43,450 | 141.3% higher in O'Fallon |
| Groceries index | 99.7 | 94.4 | 5.6% higher in O'Fallon |
| Utilities index | 71.9 | 86.4 | 20.1% higher in Springfield |
| Transportation index | 98.5 | 93.4 | 5.5% higher in O'Fallon |
| Healthcare index | 98.7 | 93.6 | 5.5% 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 O'Fallon, you'd need $91,349 in Springfield to maintain your standard of living.
Climate, safety, and demographics side by side.
Springfield, MO is about 8.7% cheaper overall than O'Fallon, MO, based on our cost-of-living index. Housing costs are roughly 23% higher in O'Fallon than in Springfield. If you earn $80,000 in O'Fallon, you'd need about $73,079 in Springfield to keep the same standard of living.