Flight OddsUA4556 IAD → PWM
United Airlines · Washington, DC to Portland, ME · 15 flights observed, 2025-12-18 to 2026-01-04 · 493 mi
UA4556 covers more than one route in the data window — the stats below are for IAD → PWM, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
33%
Median delay
+26 min
90th percentile
+153 min
Cancellation rate
0%
How often is UA4556 on time?
Across 15 flights on IAD → PWM from 2025-12-18 to 2026-01-04, UA4556 arrived within 15 minutes of schedule 33% of the time. The median arrival delay was +26 min, and the worst 10% of flights arrived +153 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 | 5 | 33% |
| 16-30 min | 3 | 20% |
| 31-60 min | 3 | 20% |
| 61-120 min | 1 | 7% |
| 2+ hrs | 3 | 20% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-12 | 12 | 33% | +44 min |
| 2026-01 | 3 | 33% | +66 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 2 | 0% |
| Tue | 2 | 50% |
| Wed | 2 | 0% |
| Thu | 3 | 33% |
| Fri | 3 | 33% |
| Sat | No data | — |
| 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…