Flight profile · United Airlines
UA1644
San Juan (SJU) to Houston (IAH) · scheduled 7:00 AM – 10:51 AM
How UA1644 performs
954 operations, 2023-07-01 to 2026-06-30.
UA1644 arrived on time 93.8% of the time, against 84.0% for all SJU → IAH flights — this specific departure is 9.8 percentage points better than the route as a whole. Against United Airlines’s own flights on this route it is 8.5 points better.
Source: US DOT Bureau of Transportation Statistics · 954 operations between 2023-07-01 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| UA1644 | 93.8% | 0.94% | -14 min | 1.9% | 954 |
| United Airlines on SJU → IAH | 85.3% | 0.90% | -10 min | 4.4% | 2,450 |
| All SJU → IAH flights | 84.0% | 1.11% | -9 min | 5.0% | 2,784 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30
By day of week
Does UA1644 run worse on particular days?
Wednesday is historically the most reliable day and Friday the least, a gap of 5.2 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-07-01 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes UA1644 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
Because the same number has served different journeys, the statistics above describe only the route UA1644 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 954 records of UA1644 operating SJU → IAH, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.