UA1878
United Airlines flight 1878 — Chicago (ORD) to San Francisco (SFO)
On time
85%
Avg delay
~64 min
Cancelled
0.9%
UA1878 is a reliable flight. About 85% 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 | 100% | 0.0% | 0 min |
| 2026-06 | 97% | 3.3% | 64 min |
| 2026-05 | 88% | 0.0% | 43 min |
| 2026-05 | 80% | 0.0% | 55 min |
| 2026-05 | 65% | 0.0% | 52 min |
| 2026-04 | 81% | 5.9% | 202 min |
| 2026-04 | 77% | 0.0% | 56 min |
| 2026-03 | 86% | 3.3% | 32 min |
| 2026-03 | 100% | 0.0% | 0 min |
| 2026-02 | 89% | 0.0% | 23 min |
| 2026-02 | 83% | 0.0% | 31 min |
| 2026-02 | 88% | 0.0% | 45 min |
Top delay cause
late-arriving aircraft
Based on 2,231 tracked departures
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Get a free briefingData last updated October 2026. Source: Bureau of Transportation Statistics.