Best Time to Fly PHX to IAH: On-Time Stats by Hour & Airline
Phoenix Sky Harbor International → George Bush Intercontinental/Houston
Data through July 2026 · Last updated October 18, 2026
2,957 flights were scheduled from Phoenix (PHX) to Houston (IAH) in the last 12 months, and 81.2% of those that flew arrived on time, 3.5 points above the US average of 77.6%.
Among 5 airlines, United Airlines led with 84.9% on time and SkyWest Airlines was last with 72.2%.
Over 24 months, Wednesday was the most reliable day (86% on time) and June the worst month (73%).
The cancellation rate was 0.8% (US average 1.8%).
PHX to IAH 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 | 84.9% | 78 min | 0.4% | 1,775 |
| Envoy Air | 81.6% | 30 min | 0.0% | 38 |
| Frontier Airlines | 78.9% | 60 min | 0.7% | 291 |
| American Airlines | 74.7% | 70 min | 1.5% | 672 |
| SkyWest Airlines | 72.2% | 80 min | 2.8% | 181 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PHX to IAH
On-time arrival % by scheduled departure hour (local time), 5,930 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 2 | |
| 5am–6am | 87.5% | 1.4% | 73 |
| 6am–7am | 91.4% | 0.9% | 425 |
| 7am–8am | 89.3% | 1.1% | 276 |
| 8am–9am | 84.8% | 0.6% | 826 |
| 9am–10am | 88.0% | 1.1% | 660 |
| 10am–11am | 87.6% | 0.6% | 356 |
| 11am–12pm | 94.0% | 0.8% | 253 |
| 12pm–1pm | 77.7% | 0.0% | 617 |
| 1pm–2pm | 83.5% | 1.1% | 442 |
| 2pm–3pm | 83.7% | 2.0% | 152 |
| 3pm–4pm | 80.5% | 0.4% | 259 |
| 4pm–5pm | 74.9% | 1.4% | 498 |
| 5pm–6pm | 78.8% | 1.0% | 295 |
| 6pm–7pm | 70.6% | 1.5% | 408 |
| 7pm–8pm | 76.2% | 0.9% | 225 |
| 8pm–9pm | 79.7% | 2.0% | 147 |
| 11pm–12am | Limited data | 16 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PHX to IAH
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) | 83.5% | -0.8 pts | 0.0% | 121 |
| Christmas & New Year (Dec 20 - Jan 3) | 83.9% | -0.3 pts | 1.2% | 240 |
| Summer peak (Jun 15 - Aug 15) | 75.1% | -9.2 pts | 1.4% | 895 |
| All other days | 84.2% | — | 0.8% | 4,674 |
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).