UA1577
United Airlines flight 1577 — Chicago (ORD) to San Francisco (SFO)
On time
78%
Avg delay
~77 min
Cancelled
1.2%
UA1577 is fairly reliable, though delays happen. About 78% 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 | 74% | 0.0% | 134 min |
| 2026-07 | 63% | 0.0% | 43 min |
| 2026-06 | 92% | 0.0% | 31 min |
| 2026-06 | 59% | 0.0% | 174 min |
| 2026-06 | 70% | 0.0% | 80 min |
| 2026-05 | 82% | 0.0% | 82 min |
| 2026-05 | 88% | 0.0% | 23 min |
| 2026-05 | 71% | 0.0% | 82 min |
| 2026-05 | 75% | 0.0% | 32 min |
| 2026-05 | 73% | 0.0% | 78 min |
| 2026-04 | 63% | 0.0% | 45 min |
| 2026-04 | 100% | 0.0% | 0 min |
Top delay cause
airline operations
Based on 1,870 tracked departures
Flying UA1577? Get a free briefing.
Weather, delays, and what to expect — sent to your inbox before your flight.
Get a free briefingData last updated October 2026. Source: Bureau of Transportation Statistics.