UA528
United Airlines flight 528 — Chicago (ORD) to San Francisco (SFO)
On time
83%
Avg delay
~86 min
Cancelled
1.5%
UA528 is a reliable flight. About 83% of departures arrive on time. When delays happen, the most common cause is late-arriving aircraft.
Monthly breakdown
| Month | On time | Cancelled | Avg delay |
|---|---|---|---|
| 2026-07 | 87% | 0.0% | 34 min |
| 2026-06 | 83% | 0.0% | 46 min |
| 2026-05 | 89% | 5.0% | 86 min |
| 2026-05 | 84% | 0.0% | 54 min |
| 2026-04 | 77% | 0.0% | 81 min |
| 2026-03 | 76% | 0.0% | 135 min |
| 2026-03 | 67% | 0.0% | 62 min |
| 2026-02 | 92% | 7.7% | 28 min |
| 2026-02 | 100% | 0.0% | 0 min |
| 2026-02 | 71% | 0.0% | 66 min |
| 2026-01 | 97% | 6.5% | 86 min |
| 2025-12 | 83% | 0.0% | 90 min |
Top delay cause
late-arriving aircraft
Based on 1,786 tracked departures
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Get a free briefingData last updated October 2026. Source: Bureau of Transportation Statistics.