Flight OddsUnited Airlines · Houston, TX to Raleigh/Durham, NC · 268 flights observed, 2025-08-01 to 2026-04-29 · 1,042 mi
UA1821 covers more than one route in the data window — the stats below are for IAH → RDU, the one it has flown most recently. The others are linked under “Other routes”.
How often is UA1821 on time?
Across 268 flights on IAH → RDU from 2025-08-01 to 2026-04-29, UA1821 arrived within 15 minutes of schedule 94% of the time. The median arrival delay was -10 min, and the worst 10% of flights arrived +7 min or later. 1% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 249 | 94% |
| 16-30 min | 4 | 2% |
| 31-60 min | 7 | 3% |
| 61-120 min | 4 | 2% |
| 2+ hrs | 1 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-08 | 28 | 93% | +0 min |
| 2025-09 | 30 | 97% | -10 min |
| 2025-10 | 31 | 97% | -7 min |
| 2025-11 | 29 | 93% | -5 min |
| 2025-12 | 31 | 90% | -2 min |
| 2026-01 | 28 | 100% | -15 min |
| 2026-02 | 28 | 93% | -8 min |
| 2026-03 | 31 | 90% | +2 min |
| 2026-04 | 29 | 93% | -6 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 39 | 87% |
| Tue | 39 | 95% |
| Wed | 39 | 100% |
| Thu | 37 | 95% |
| Fri | 39 | 95% |
| Sat | 34 | 97% |
| Sun | 38 | 89% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…