Flight OddsUA2231 SFO → ORD
United Airlines · San Francisco, CA to Chicago, IL · 53 flights observed, 2025-10-26 to 2025-12-17 · 1,846 mi
UA2231 covers more than one route in the data window — the stats below are for SFO → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
88%
Median delay
-7 min
90th percentile
+17 min
Cancellation rate
2%
How often is UA2231 on time?
Across 53 flights on SFO → ORD from 2025-10-26 to 2025-12-17, UA2231 arrived within 15 minutes of schedule 88% of the time. The median arrival delay was -7 min, and the worst 10% of flights arrived +17 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 | 46 | 88% |
| 16-30 min | 3 | 6% |
| 31-60 min | 0 | 0% |
| 61-120 min | 1 | 2% |
| 2+ hrs | 2 | 4% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-10 | 6 | 100% | -8 min |
| 2025-11 | 29 | 86% | +14 min |
| 2025-12 | 17 | 88% | -5 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 8 | 75% |
| Tue | 8 | 100% |
| Wed | 8 | 100% |
| Thu | 7 | 100% |
| Fri | 7 | 100% |
| Sat | 7 | 71% |
| Sun | 7 | 71% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…