Flight OddsUA321 PHL → ORD
United Airlines · Philadelphia, PA to Chicago, IL · 36 flights observed, 2025-12-19 to 2026-03-28 · 678 mi
UA321 covers more than one route in the data window — the stats below are for PHL → ORD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
71%
Median delay
+1 min
90th percentile
+31 min
Cancellation rate
3%
How often is UA321 on time?
Across 36 flights on PHL → ORD from 2025-12-19 to 2026-03-28, UA321 arrived within 15 minutes of schedule 71% of the time. The median arrival delay was +1 min, and the worst 10% of flights arrived +31 min or later. 3% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 24 | 71% |
| 16-30 min | 6 | 18% |
| 31-60 min | 3 | 9% |
| 61-120 min | 1 | 3% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-12 | 13 | 46% | +20 min |
| 2026-01 | 5 | 60% | +6 min |
| 2026-03 | 16 | 94% | -2 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 80% |
| Tue | 2 | 50% |
| Wed | 2 | 100% |
| Thu | 6 | 83% |
| Fri | 6 | 50% |
| Sat | 7 | 71% |
| Sun | 6 | 67% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…