Best Time to Fly IAH to STT: On-Time Stats by Hour & Airline
George Bush Intercontinental/Houston → Cyril E King
Data through July 2026 · Last updated October 18, 2026
173 flights were scheduled from Houston (IAH) to Charlotte Amalie (STT) in the last 12 months, and 83.5% of those that flew arrived on time, 5.9 points above the US average of 77.6%.
United Airlines was the only reporting airline with regular flights on this route.
May has been the best month (93% on time) and Thursday the weakest day of the week (76%).
1.7% of flights were cancelled, versus 1.8% nationally.
IAH to STT on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| United Airlines | 83.5% | 42 min | 1.7% | 173 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAH to STT
On-time arrival % by scheduled departure hour (local time), 315 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 7am–8am | 65.4% | 1.9% | 53 |
| 9am–10am | 86.5% | 0.8% | 262 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on IAH to STT
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | Limited data | 4 | ||
| Christmas & New Year (Dec 20 - Jan 3) | Limited data | 9 | ||
| Summer peak (Jun 15 - Aug 15) | 84.7% | +3.5 pts | 0.0% | 124 |
| All other days | 81.1% | — | 1.1% | 178 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).