UA277
United Airlines flight 277 — Ontario (ONT) to San Francisco (SFO)
On time
84%
Avg delay
~58 min
Cancelled
1.1%
UA277 is a reliable flight. About 84% 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 | 77% | 0.0% | 60 min |
| 2026-07 | 87% | 0.0% | 27 min |
| 2026-06 | 69% | 0.0% | 68 min |
| 2026-06 | 90% | 0.0% | 30 min |
| 2026-05 | 90% | 0.0% | 45 min |
| 2026-05 | 90% | 0.0% | 78 min |
| 2026-04 | 88% | 0.0% | 40 min |
| 2026-04 | 97% | 0.0% | 141 min |
| 2026-03 | 73% | 3.7% | 87 min |
| 2026-03 | 78% | 0.0% | 146 min |
| 2026-02 | 82% | 0.0% | 35 min |
| 2026-01 | 100% | 0.0% | 0 min |
Top delay cause
airline operations
Based on 2,123 tracked departures
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Get a free briefingData last updated October 2026. Source: Bureau of Transportation Statistics.