City comparison
Longmont, CO is about 850 miles (1,300 km) from San Diego, CA 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 Longmont, CO to San Diego, CA takes about 1 h 41 min, covering roughly 850 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.
Longmont, CO is on Mountain Time and San Diego, CA is on Pacific Time — a 1-hour difference. When it's noon in Longmont, it's 11 a.m. in San Diego, which puts Longmont 1 hours ahead.
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 Diego has a population of 1,383,987, vs 98,282 in Longmont — about 14.1× larger by population. By land area, San Diego covers about 325 sq mi vs 29 sq mi for Longmont.
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 | Longmont | San Diego | Difference |
|---|---|---|---|
| Median rent | $1,689/mo | $2,080/mo | 23.1% higher in San Diego |
| Median home value | $488,100 | $783,300 | 60.5% higher in San Diego |
| Median household income | $89,720 | $98,657 | 10.0% higher in San Diego |
| Groceries index | 96.8 | 107.6 | 11.2% higher in San Diego |
| Utilities index | 86.5 | 169.8 | 96.2% higher in San Diego |
| Transportation index | 100.3 | 100.0 | ≈ equal (Longmont slightly higher) |
| Healthcare index | 100.2 | 100.0 | ≈ equal (Longmont slightly higher) |
How much you'd need to earn in the other city to keep the same standard of living.
If you earn $100,000 in Longmont, you'd need $115,590 in San Diego to maintain your standard of living.
Climate, safety, and demographics side by side.
Longmont, CO is about 13.5% cheaper overall than San Diego, CA, based on our cost-of-living index. Housing costs are roughly 15% higher in San Diego than in Longmont. If you earn $80,000 in Longmont, you'd need about $92,472 in San Diego to keep the same standard of living.