Best Time to Fly PHL to IAH: On-Time Stats by Hour & Airline
Philadelphia International → George Bush Intercontinental/Houston
Data through July 2026 · Last updated October 18, 2026
1,847 flights were scheduled from Philadelphia (PHL) to Houston (IAH) in the last 12 months, and 80.9% of those that flew arrived on time, 3.3 points above the US average of 77.6%.
United Airlines was the most punctual of the 4 airlines on the route at 86.0%, while Frontier Airlines trailed at 67.6%.
November has been the best month (88% on time) and Monday the weakest day of the week (77%).
1.9% of flights were cancelled, versus 1.8% nationally.
PHL 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 | 86.0% | 84 min | 1.1% | 923 |
| PSA Airlines | 77.3% | 77 min | 2.2% | 92 |
| American Airlines | 76.5% | 82 min | 3.0% | 728 |
| Frontier Airlines | 67.6% | 64 min | 1.4% | 72 |
| Republic Airways | Limited data | 20 | ||
| Spirit Airlines | Limited data | 12 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PHL to IAH
On-time arrival % by scheduled departure hour (local time), 3,653 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 95.2% | 4.5% | 44 |
| 6am–7am | 93.9% | 0.3% | 297 |
| 7am–8am | 65.9% | 0.0% | 85 |
| 8am–9am | 85.8% | 1.2% | 667 |
| 9am–10am | 80.9% | 1.3% | 229 |
| 10am–11am | 84.0% | 2.4% | 126 |
| 11am–12pm | 63.5% | 2.8% | 109 |
| 12pm–1pm | 87.9% | 0.8% | 521 |
| 1pm–2pm | 82.1% | 1.5% | 205 |
| 2pm–3pm | Limited data | 13 | |
| 3pm–4pm | 60.9% | 4.5% | 67 |
| 4pm–5pm | Limited data | 5 | |
| 5pm–6pm | 79.2% | 0.8% | 252 |
| 6pm–7pm | 71.8% | 3.1% | 652 |
| 7pm–8pm | 66.7% | 4.4% | 251 |
| 8pm–9pm | Limited data | 24 | |
| 9pm–10pm | 70.8% | 4.0% | 100 |
| 10pm–11pm | Limited data | 6 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PHL 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) | 81.4% | -0.8 pts | 0.0% | 70 |
| Christmas & New Year (Dec 20 - Jan 3) | 73.7% | -8.6 pts | 1.9% | 155 |
| Summer peak (Jun 15 - Aug 15) | 71.2% | -11.0 pts | 3.3% | 691 |
| All other days | 82.2% | — | 1.6% | 2,737 |
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).