City comparison
O'Fallon, MO is about 800 miles (1,300 km) from San Antonio, TX in a straight line. By road, the drive is roughly 1,000 miles, or about 16 hours 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 San Antonio, TX takes about 1 h 34 min, covering roughly 800 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.
San Antonio has a population of 1,445,662, vs 91,825 in O'Fallon — about 15.7× larger by population. By land area, San Antonio covers about 500 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 | San Antonio | Difference |
|---|---|---|---|
| Median rent | $1,311/mo | $1,189/mo | 10.3% higher in O'Fallon |
| Median home value | $283,600 | $198,000 | 43.2% higher in O'Fallon |
| Median household income | $104,863 | $59,593 | 76.0% higher in O'Fallon |
| Groceries index | 99.7 | 94.2 | 5.8% higher in O'Fallon |
| Utilities index | 71.9 | 83.3 | 15.9% higher in San Antonio |
| Transportation index | 98.5 | 96.6 | 1.9% higher in O'Fallon |
| Healthcare index | 98.7 | 96.1 | 2.7% 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 $105,696 in San Antonio to maintain your standard of living.
Climate, safety, and demographics side by side.
O'Fallon, MO is about 5.4% cheaper overall than San Antonio, TX, based on our cost-of-living index. Housing costs are roughly 16% higher in San Antonio than in O'Fallon. If you earn $80,000 in O'Fallon, you'd need about $84,557 in San Antonio to keep the same standard of living.