UA1535
United Airlines flight 1535 — Washington (IAD) to Houston (IAH)
On time
74%
Avg delay
~64 min
Cancelled
1.5%
UA1535 is fairly reliable, though delays happen. About 74% 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 | 77% | 0.0% | 99 min |
| 2026-07 | 58% | 0.0% | 107 min |
| 2026-07 | 70% | 3.2% | 51 min |
| 2026-06 | 77% | 0.0% | 95 min |
| 2026-06 | 50% | 0.0% | 90 min |
| 2026-06 | 90% | 0.0% | 137 min |
| 2026-05 | 87% | 0.0% | 45 min |
| 2026-05 | 67% | 3.2% | 94 min |
| 2026-05 | 100% | 0.0% | 0 min |
| 2026-04 | 100% | 0.0% | 0 min |
| 2026-04 | 80% | 0.0% | 55 min |
| 2026-04 | 97% | 0.0% | 111 min |
Top delay cause
late-arriving aircraft
Based on 1,912 tracked departures
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Get a free briefingData last updated October 2026. Source: Bureau of Transportation Statistics.