Best Time to Fly IAH to PHL: On-Time Stats by Hour & Airline
George Bush Intercontinental/Houston → Philadelphia International
Data through July 2026 · Last updated October 18, 2026
1,848 flights were scheduled from Houston (IAH) to Philadelphia (PHL) in the last 12 months, and 78.7% of those that flew arrived on time, 1.1 points above the US average of 77.6%.
Among 4 airlines, United Airlines led with 81.5% on time and PSA Airlines was last with 70.8%.
Over 24 months, Tuesday was the most reliable day (83% on time) and July the worst month (59%).
The cancellation rate was 2.0% (US average 1.8%).
IAH to PHL 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 | 81.5% | 69 min | 1.1% | 922 |
| American Airlines | 77.2% | 135 min | 3.1% | 730 |
| Frontier Airlines | 71.8% | 85 min | 1.4% | 72 |
| PSA Airlines | 70.8% | 162 min | 2.2% | 92 |
| Spirit Airlines | Limited data | 12 | ||
| Republic Airways | Limited data | 20 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly IAH to PHL
On-time arrival % by scheduled departure hour (local time), 3,652 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 91.9% | 1.0% | 101 |
| 6am–7am | 87.7% | 2.7% | 225 |
| 7am–8am | 89.5% | 1.9% | 802 |
| 8am–9am | 90.3% | 2.4% | 328 |
| 10am–11am | 71.1% | 0.0% | 45 |
| 11am–12pm | 70.2% | 2.3% | 86 |
| 12pm–1pm | 75.0% | 1.1% | 622 |
| 1pm–2pm | 73.4% | 3.3% | 301 |
| 2pm–3pm | 66.4% | 4.0% | 227 |
| 3pm–4pm | 61.1% | 0.0% | 54 |
| 4pm–5pm | 65.2% | 2.1% | 94 |
| 6pm–7pm | 74.5% | 1.2% | 687 |
| 7pm–8pm | 57.6% | 4.3% | 69 |
| 8pm–9pm | Limited data | 11 | |
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 PHL
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) | 82.6% | +0.3 pts | 0.0% | 70 |
| Christmas & New Year (Dec 20 - Jan 3) | 78.8% | -3.5 pts | 2.6% | 155 |
| Summer peak (Jun 15 - Aug 15) | 65.2% | -17.1 pts | 3.6% | 692 |
| All other days | 82.3% | — | 1.5% | 2,735 |
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).