Flight OddsUnited Airlines · West Palm Beach/Palm Beach, FL to Chicago, IL · 20 flights observed, 2026-05-01 to 2026-05-20 · 1,144 mi
UA1521 covers more than one route in the data window — the stats below are for PBI → ORD, the one it has flown most recently. The others are linked under “Other routes”.
How often is UA1521 on time?
Across 20 flights on PBI → ORD from 2026-05-01 to 2026-05-20, UA1521 arrived within 15 minutes of schedule 75% of the time. The median arrival delay was +2 min, and the worst 10% of flights arrived +81 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 15 | 75% |
| 16-30 min | 1 | 5% |
| 31-60 min | 1 | 5% |
| 61-120 min | 1 | 5% |
| 2+ hrs | 2 | 10% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-05 | 20 | 75% | +21 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 33% |
| Tue | 3 | 67% |
| Wed | 3 | 67% |
| Thu | 2 | 50% |
| Fri | 3 | 100% |
| Sat | 3 | 100% |
| Sun | 3 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…