City comparison
San Diego, CA is about 450 miles (700 km) from San Mateo, CA in a straight line. By road, the drive is roughly 550 miles, or about 9 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 San Diego, CA to San Mateo, CA takes about 53 min, covering roughly 450 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 Diego has a population of 1,383,987, vs 104,165 in San Mateo — about 13.3× larger by population. By land area, San Diego covers about 325 sq mi vs 12 sq mi for San Mateo.
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 | San Diego | San Mateo | Difference |
|---|---|---|---|
| Median rent | $2,080/mo | $2,971/mo | 42.8% higher in San Mateo |
| Median home value | $783,300 | $1,508,900 | 92.6% higher in San Mateo |
| Median household income | $98,657 | $149,152 | 51.2% higher in San Mateo |
| Groceries index | 107.6 | 108.1 | ≈ equal (San Mateo slightly higher) |
| Utilities index | 169.8 | 168.3 | 0.9% higher in San Diego |
| Transportation index | 100.0 | 106.1 | 6.0% higher in San Mateo |
| Healthcare index | 100.0 | 106.0 | 6.0% higher in San Mateo |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in San Diego, you'd need $107,466 in San Mateo to maintain your standard of living.
Climate, safety, and demographics side by side.
San Diego, CA is about 6.9% cheaper overall than San Mateo, CA, based on our cost-of-living index. Housing costs are roughly 11% higher in San Mateo than in San Diego. If you earn $80,000 in San Diego, you'd need about $85,973 in San Mateo to keep the same standard of living.