UA1840
United Airlines flight 1840 — Denver (DEN) to Salt Lake City (SLC)
On time
79%
Avg delay
~68 min
Cancelled
1.5%
UA1840 is fairly reliable, though delays happen. About 79% 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% | 55 min |
| 2026-06 | 83% | 0.0% | 95 min |
| 2026-05 | 90% | 0.0% | 165 min |
| 2026-04 | 87% | 0.0% | 46 min |
| 2026-04 | 72% | 0.0% | 97 min |
| 2026-03 | 100% | 0.0% | 0 min |
| 2026-03 | 88% | 0.0% | 88 min |
| 2026-03 | 100% | 0.0% | 0 min |
| 2026-03 | 33% | 0.0% | 148 min |
| 2026-02 | 89% | 0.0% | 73 min |
| 2026-01 | 100% | 0.0% | 0 min |
| 2026-01 | 92% | 3.8% | 131 min |
Top delay cause
late-arriving aircraft
Based on 1,792 tracked departures
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Get a free briefingData last updated October 2026. Source: Bureau of Transportation Statistics.