Flight OddsUA4540 IAD → PHL
United Airlines · Washington, DC to Philadelphia, PA · 18 flights observed, 2025-12-18 to 2026-01-04 · 135 mi
UA4540 covers more than one route in the data window — the stats below are for IAD → PHL, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
78%
Median delay
-4 min
90th percentile
+160 min
Cancellation rate
0%
How often is UA4540 on time?
Across 18 flights on IAD → PHL from 2025-12-18 to 2026-01-04, UA4540 arrived within 15 minutes of schedule 78% of the time. The median arrival delay was -4 min, and the worst 10% of flights arrived +160 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 | 14 | 78% |
| 16-30 min | 2 | 11% |
| 31-60 min | 0 | 0% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 2 | 11% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-12 | 14 | 79% | +32 min |
| 2026-01 | 4 | 75% | +157 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 2 | 100% |
| Tue | 2 | 50% |
| Wed | 2 | 100% |
| Thu | 3 | 100% |
| Fri | 3 | 67% |
| Sat | 3 | 67% |
| Sun | 3 | 67% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…