UA644
United Airlines flight 644 — Denver (DEN) to Portland (PDX)
On time
84%
Avg delay
~64 min
Cancelled
0.3%
UA644 is a reliable flight. About 84% of departures arrive on time. When delays happen, the most common cause is late-arriving aircraft.
Monthly breakdown
| Month | On time | Cancelled | Avg delay |
|---|---|---|---|
| 2026-07 | 90% | 0.0% | 49 min |
| 2026-07 | 84% | 0.0% | 59 min |
| 2026-06 | 67% | 0.0% | 38 min |
| 2026-06 | 90% | 0.0% | 66 min |
| 2026-05 | 84% | 0.0% | 42 min |
| 2026-05 | 90% | 0.0% | 25 min |
| 2026-05 | 91% | 0.0% | 24 min |
| 2026-04 | 97% | 0.0% | 23 min |
| 2026-04 | 93% | 0.0% | 30 min |
| 2026-03 | 87% | 0.0% | 38 min |
| 2026-03 | 100% | 0.0% | 0 min |
| 2026-03 | 100% | 0.0% | 0 min |
Top delay cause
late-arriving aircraft
Based on 1,881 tracked departures
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Get a free briefingData last updated October 2026. Source: Bureau of Transportation Statistics.