Flight OddsUA3991 BHM → IAH
United Airlines · Birmingham, AL to Houston, TX · 35 flights observed, 2025-12-02 to 2026-05-20 · 562 mi
UA3991 covers more than one route in the data window — the stats below are for BHM → IAH, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
74%
Median delay
-9 min
90th percentile
+50 min
Cancellation rate
0%
How often is UA3991 on time?
Across 35 flights on BHM → IAH from 2025-12-02 to 2026-05-20, UA3991 arrived within 15 minutes of schedule 74% of the time. The median arrival delay was -9 min, and the worst 10% of flights arrived +50 min or later. 0% of flights were cancelled.
Delay distribution
Arrival delay for completed flights (excludes cancellations and diversions).
| Arrival | Flights | Share |
|---|---|---|
| Early / on-time | 26 | 74% |
| 16-30 min | 3 | 9% |
| 31-60 min | 5 | 14% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 1 | 3% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-12 | 14 | 71% | +0 min |
| 2026-04 | 1 | 0% | +52 min |
| 2026-05 | 20 | 80% | +6 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 5 | 100% |
| Tue | 6 | 83% |
| Wed | 6 | 67% |
| Thu | 5 | 80% |
| Fri | 5 | 40% |
| Sat | 3 | 100% |
| Sun | 5 | 60% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…