Flight OddsUA4578 PWM → IAD
United Airlines · Portland, ME to Washington, DC · 24 flights observed, 2026-03-29 to 2026-04-29 · 493 mi
UA4578 covers more than one route in the data window — the stats below are for PWM → IAD, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
88%
Median delay
-16 min
90th percentile
+29 min
Cancellation rate
0%
How often is UA4578 on time?
Across 24 flights on PWM → IAD from 2026-03-29 to 2026-04-29, UA4578 arrived within 15 minutes of schedule 88% of the time. The median arrival delay was -16 min, and the worst 10% of flights arrived +29 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 | 21 | 88% |
| 16-30 min | 0 | 0% |
| 31-60 min | 3 | 13% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2026-03 | 3 | 100% | -18 min |
| 2026-04 | 21 | 86% | -9 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 100% |
| Tue | 5 | 100% |
| Wed | 5 | 60% |
| Thu | 3 | 100% |
| Fri | 3 | 67% |
| Sat | 2 | 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…