City comparison
Cupertino, CA is about 325 miles (550 km) from Diamond Bar, CA in a straight line. By road, the drive is roughly 400 miles, or about 6 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 Cupertino, CA to Diamond Bar, CA takes about 40 min, covering roughly 325 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.
Cupertino has a population of 59,763, vs 54,534 in Diamond Bar — about the same size. By land area, Diamond Bar covers about 15 sq mi vs 11 sq mi for Cupertino.
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 | Cupertino | Diamond Bar | Difference |
|---|---|---|---|
| Median rent | $3,501/mo | $2,332/mo | 50.1% higher in Cupertino |
| Median home value | $2,000,001 | $829,000 | 141.3% higher in Cupertino |
| Median household income | $223,667 | $106,881 | 109.3% higher in Cupertino |
| Groceries index | 105.1 | 106.4 | 1.3% higher in Diamond Bar |
| Utilities index | 153.8 | 155.6 | 1.1% higher in Diamond Bar |
| Transportation index | 100.7 | 104.4 | 3.7% higher in Diamond Bar |
| Healthcare index | 100.6 | 104.3 | 3.7% higher in Diamond Bar |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in Cupertino, you'd need $88,501 in Diamond Bar to maintain your standard of living.
Climate, safety, and demographics side by side.
Diamond Bar, CA is about 11.5% cheaper overall than Cupertino, CA, based on our cost-of-living index. Housing costs are roughly 27% higher in Cupertino than in Diamond Bar. If you earn $80,000 in Cupertino, you'd need about $70,801 in Diamond Bar to keep the same standard of living.