Flight OddsUA1231 ORD → IAH
United Airlines · Chicago, IL to Houston, TX · 208 flights observed, 2025-10-26 to 2026-06-30 · 925 mi
UA1231 covers more than one route in the data window — the stats below are for ORD → IAH, the one it has flown most recently. The others are linked under “Other routes”.
On-time arrival
91%
Median delay
-14 min
90th percentile
+13 min
Cancellation rate
1%
How often is UA1231 on time?
Across 208 flights on ORD → IAH from 2025-10-26 to 2026-06-30, UA1231 arrived within 15 minutes of schedule 91% of the time. The median arrival delay was -14 min, and the worst 10% of flights arrived +13 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 | 188 | 91% |
| 16-30 min | 6 | 3% |
| 31-60 min | 8 | 4% |
| 61-120 min | 0 | 0% |
| 2+ hrs | 4 | 2% |
Performance by month
| Month | Flights | On-time | Avg delay |
|---|---|---|---|
| 2025-10 | 6 | 100% | -21 min |
| 2025-11 | 29 | 93% | -14 min |
| 2025-12 | 30 | 93% | -11 min |
| 2026-01 | 4 | 100% | -24 min |
| 2026-02 | 17 | 88% | -20 min |
| 2026-03 | 30 | 83% | +8 min |
| 2026-04 | 29 | 86% | +3 min |
| 2026-05 | 31 | 94% | -7 min |
| 2026-06 | 30 | 97% | -12 min |
Performance by day of week
| Day | Flights | On-time |
|---|---|---|
| Mon | 31 | 94% |
| Tue | 30 | 97% |
| Wed | 28 | 100% |
| Thu | 28 | 96% |
| Fri | 29 | 83% |
| Sat | 29 | 83% |
| Sun | 31 | 87% |
Other routes
Related
Based on US Department of Transportation Bureau of Transportation Statistics on-time data. Loading live conditions and full charts…