City comparison
Boulder, CO 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 17 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 Boulder, CO to San Antonio, TX takes about 1 h 39 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.
Boulder, CO is on Mountain Time and San Antonio, TX is on Central Time — a 1-hour difference. When it's noon in Boulder, it's 1 p.m. in San Antonio, which puts Boulder 1 hours behind.
Standard-time offsets. Daylight saving applies in both cities for most of the year (exceptions: Hawaii and most of Arizona), and the gap between the two stays the same.
San Antonio has a population of 1,445,662, vs 106,598 in Boulder — about 13.6× larger by population. By land area, San Antonio covers about 500 sq mi vs 27 sq mi for Boulder.
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 | Boulder | San Antonio | Difference |
|---|---|---|---|
| Median rent | $1,853/mo | $1,189/mo | 55.8% higher in Boulder |
| Median home value | $919,700 | $198,000 | 364.5% higher in Boulder |
| Median household income | $80,243 | $59,593 | 34.7% higher in Boulder |
| Groceries index | 96.8 | 94.2 | 2.7% higher in Boulder |
| Utilities index | 86.5 | 83.3 | 3.9% higher in Boulder |
| Transportation index | 100.3 | 96.6 | 3.7% higher in Boulder |
| Healthcare index | 100.2 | 96.1 | 4.3% higher in Boulder |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in Boulder, you'd need $77,089 in San Antonio to maintain your standard of living.
Climate, safety, and demographics side by side.
San Antonio, TX is about 22.9% cheaper overall than Boulder, CO, based on our cost-of-living index. Housing costs are roughly 65% higher in Boulder than in San Antonio. If you earn $80,000 in Boulder, you'd need about $61,672 in San Antonio to keep the same standard of living.