Flight OddsUA3999 ATL → IAH
United Airlines · Atlanta, GA to Houston, TX · 19 flights observed, 2025-12-18 to 2026-01-05 · 689 mi
UA3999 covers more than one route in the data window — the stats below are for ATL → IAH, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
89%
Median delay
-19 min
90th percentile
+8 min
Cancellation rate
0%
How often is UA3999 on time?
Across 19 flights on ATL → IAH from 2025-12-18 to 2026-01-05, UA3999 arrived within 15 minutes of schedule 89% of the time. The median arrival delay was -19 min, and the worst 10% of flights arrived +8 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 | 17 | 89% |
| 16-30 min | 1 | 5% |
| 31-60 min | 1 | 5% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 0 | 0% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-12 | 14 | 93% | -18 min |
| 2026-01 | 5 | 80% | -13 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 3 | 67% |
| Tue | 2 | 100% |
| Wed | 2 | 100% |
| Thu | 3 | 100% |
| Fri | 3 | 100% |
| Sat | 3 | 67% |
| Sun | 3 | 100% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…