UA660
United Airlines flight 660 — Chicago (ORD) to San Diego (SAN)
On time
87%
Avg delay
~54 min
Cancelled
1.3%
UA660 is a reliable flight. About 87% of departures arrive on time. When delays happen, the most common cause is airline operations.
Monthly breakdown
| Month | On time | Cancelled | Avg delay |
|---|---|---|---|
| 2026-07 | 81% | 0.0% | 31 min |
| 2026-07 | 85% | 12.9% | 30 min |
| 2026-06 | 90% | 0.0% | 34 min |
| 2026-06 | 100% | 3.3% | 0 min |
| 2026-05 | 90% | 0.0% | 34 min |
| 2026-05 | 90% | 0.0% | 21 min |
| 2026-04 | 80% | 0.0% | 46 min |
| 2026-04 | 89% | 5.0% | 67 min |
| 2026-03 | 89% | 0.0% | 27 min |
| 2026-03 | 94% | 0.0% | 143 min |
| 2026-02 | 96% | 0.0% | 123 min |
| 2026-02 | 67% | 10.0% | 24 min |
Top delay cause
airline operations
Based on 1,966 tracked departures
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Get a free briefingData last updated October 2026. Source: Bureau of Transportation Statistics.