Flight OddsUnited Airlines · Chicago, IL to San Francisco, CA · 363 flights observed, 2025-07-01 to 2026-06-30 · 1,846 mi
UA1577 covers more than one route in the data window — the stats below are for ORD → SFO, the one it has flown most recently. The others are linked under “Other routes”.
How often is UA1577 on time?
Across 363 flights on ORD → SFO from 2025-07-01 to 2026-06-30, UA1577 arrived within 15 minutes of schedule 74% of the time. The median arrival delay was -2 min, and the worst 10% of flights arrived +97 min or later. 2% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 264 | 74% |
| 16-30 min | 30 | 8% |
| 31-60 min | 16 | 4% |
| 61-120 min | 18 | 5% |
| 2+ hrs | 29 | 8% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-07 | 29 | 76% | +17 min |
| 2025-08 | 27 | 74% | +20 min |
| 2025-09 | 30 | 70% | +44 min |
| 2025-10 | 31 | 81% | +8 min |
| 2025-11 | 29 | 72% | +33 min |
| 2025-12 | 31 | 71% | +21 min |
| 2026-01 | 31 | 77% | +15 min |
| 2026-02 | 28 | 86% | -2 min |
| 2026-03 | 31 | 87% | -7 min |
| 2026-04 | 30 | 63% | +14 min |
| 2026-05 | 31 | 71% | +18 min |
| 2026-06 | 29 | 59% | +72 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 50 | 78% |
| Tue | 53 | 79% |
| Wed | 51 | 71% |
| Thu | 51 | 80% |
| Fri | 51 | 67% |
| Sat | 51 | 78% |
| Sun | 50 | 64% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…