Best Time to Fly IAH to PHX: On-Time Stats by Hour & Airline
George Bush Intercontinental/Houston → Phoenix Sky Harbor International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 79.0% of Houston (IAH) to Phoenix (PHX) flights arrived on time (2,960 scheduled flights). That is 1.4 points above the national average of 77.6%.
Envoy Air was the most punctual of the 5 airlines on the route at 89.2%, while Frontier Airlines trailed at 66.7%.
February has been the best month (89% on time) and Sunday the weakest day of the week (75%).
0.7% of flights were cancelled, versus 1.8% nationally.
IAH to PHX 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 |
|---|---|---|---|---|
| Envoy Air | 89.2% | 81 min | 0.0% | 37 |
| United Airlines | 81.2% | 61 min | 0.3% | 1,779 |
| American Airlines | 80.6% | 154 min | 1.5% | 672 |
| SkyWest Airlines | 69.3% | 75 min | 2.8% | 181 |
| Frontier Airlines | 66.7% | 75 min | 0.7% | 291 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAH to PHX
On-time arrival % by scheduled departure hour (local time), 5,932 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 2 | |
| 7am–8am | 94.7% | 0.2% | 397 |
| 8am–9am | 83.3% | 1.7% | 695 |
| 9am–10am | 80.6% | 0.0% | 129 |
| 10am–11am | 85.8% | 0.9% | 647 |
| 11am–12pm | 57.4% | 0.0% | 68 |
| 12pm–1pm | 82.8% | 0.3% | 340 |
| 1pm–2pm | 75.0% | 2.0% | 99 |
| 2pm–3pm | 82.8% | 1.0% | 1,359 |
| 3pm–4pm | Limited data | 24 | |
| 4pm–5pm | 76.9% | 0.5% | 418 |
| 5pm–6pm | 84.5% | 0.0% | 130 |
| 6pm–7pm | 71.4% | 0.8% | 511 |
| 7pm–8pm | 63.4% | 1.4% | 289 |
| 8pm–9pm | 75.2% | 0.8% | 507 |
| 9pm–10pm | 70.6% | 0.5% | 205 |
| 10pm–11pm | 49.0% | 1.9% | 104 |
| 11pm–12am | Limited data | 8 | |
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 PHX
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) | 79.5% | -1.5 pts | 0.0% | 122 |
| Christmas & New Year (Dec 20 - Jan 3) | 81.5% | +0.5 pts | 0.8% | 240 |
| Summer peak (Jun 15 - Aug 15) | 70.7% | -10.4 pts | 1.4% | 895 |
| All other days | 81.1% | — | 0.8% | 4,675 |
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).