Flight OddsUnited Airlines · Philadelphia, PA to Washington, DC · 22 flights observed, 2025-11-24 to 2026-05-20 · 135 mi
UA4540 covers more than one route in the data window — the stats below are for PHL → IAD, the one it has flown most recently. The others are linked under “Other routes”.
How often is UA4540 on time?
Across 22 flights on PHL → IAD from 2025-11-24 to 2026-05-20, UA4540 arrived within 15 minutes of schedule 77% of the time. The median arrival delay was -14 min, and the worst 10% of flights arrived +120 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 | 17 | 77% |
| 16-30 min | 0 | 0% |
| 31-60 min | 1 | 5% |
| 61-120 min | 1 | 5% |
| 2+ hrs | 3 | 14% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-11 | 1 | 100% | -25 min |
| 2026-04 | 1 | 100% | -8 min |
| 2026-05 | 20 | 75% | +34 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 4 | 75% |
| Tue | 3 | 67% |
| Wed | 3 | 67% |
| Thu | 3 | 100% |
| Fri | 3 | 67% |
| Sat | 3 | 67% |
| 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…