UA1240
United Airlines flight 1240 — Dallas (DFW) to Washington (IAD)
On time
77%
Avg delay
~75 min
Cancelled
1.2%
UA1240 is fairly reliable, though delays happen. About 77% 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 | 55% | 0.0% | 74 min |
| 2026-06 | 70% | 0.0% | 90 min |
| 2026-05 | 73% | 3.2% | 99 min |
| 2026-04 | 87% | 0.0% | 74 min |
| 2026-03 | 74% | 0.0% | 63 min |
| 2026-02 | 96% | 0.0% | 21 min |
| 2026-01 | 94% | 10.5% | 68 min |
| 2025-12 | 80% | 0.0% | 43 min |
| 2025-11 | 73% | 0.0% | 88 min |
| 2025-10 | 77% | 0.0% | 69 min |
| 2025-09 | 93% | 0.0% | 92 min |
| 2025-08 | 87% | 3.2% | 40 min |
Top delay cause
late-arriving aircraft
Based on 1,786 tracked departures
Flying UA1240? Get a free briefing.
Weather, delays, and what to expect — sent to your inbox before your flight.
Get a free briefingData last updated October 2026. Source: Bureau of Transportation Statistics.