Best Time to Fly PHL to DEN: On-Time Stats by Hour & Airline
Philadelphia International → Denver International
Data through July 2026 · Last updated October 18, 2026
3,033 flights were scheduled from Philadelphia (PHL) to Denver (DEN) in the last 12 months, and 74.6% of those that flew arrived on time, 3.0 points below the US average of 77.6%.
Among 4 airlines, United Airlines led with 83.5% on time and Frontier Airlines was last with 67.4%.
Over 24 months, Wednesday was the most reliable day (79% on time) and July the worst month (67%).
The cancellation rate was 1.2% (US average 1.8%).
PHL to DEN 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% | 80 min | 0.7% | 953 |
| American Airlines | 73.2% | 63 min | 1.4% | 904 |
| Southwest Airlines | 68.7% | 54 min | 1.1% | 879 |
| Frontier Airlines | 67.4% | 114 min | 2.7% | 297 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PHL to DEN
On-time arrival % by scheduled departure hour (local time), 6,022 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 89.8% | 0.6% | 324 |
| 6am–7am | 80.5% | 0.9% | 346 |
| 7am–8am | 88.8% | 0.5% | 189 |
| 8am–9am | 87.7% | 0.6% | 990 |
| 9am–10am | 83.9% | 0.5% | 406 |
| 10am–11am | 84.7% | 0.8% | 495 |
| 11am–12pm | 79.5% | 0.3% | 291 |
| 12pm–1pm | 71.3% | 1.1% | 184 |
| 1pm–2pm | 65.1% | 0.0% | 230 |
| 2pm–3pm | 79.5% | 2.2% | 92 |
| 3pm–4pm | 78.3% | 1.0% | 732 |
| 4pm–5pm | 59.4% | 0.4% | 241 |
| 5pm–6pm | 50.6% | 2.1% | 326 |
| 6pm–7pm | 51.2% | 3.8% | 133 |
| 7pm–8pm | 64.0% | 3.4% | 581 |
| 8pm–9pm | 65.3% | 3.3% | 399 |
| 9pm–10pm | 78.7% | 3.2% | 63 |
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 DEN
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) | 80.7% | +1.4 pts | 0.0% | 109 |
| Christmas & New Year (Dec 20 - Jan 3) | 66.4% | -12.9 pts | 1.2% | 256 |
| Summer peak (Jun 15 - Aug 15) | 66.9% | -12.5 pts | 2.4% | 1,301 |
| All other days | 79.3% | — | 1.0% | 4,356 |
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).