Best Time to Fly DEN to PHL: On-Time Stats by Hour & Airline
Denver International → Philadelphia International
Data through July 2026 · Last updated October 18, 2026
3,030 flights were scheduled from Denver (DEN) to Philadelphia (PHL) in the last 12 months, and 73.5% of those that flew arrived on time, 4.1 points below the US average of 77.6%.
United Airlines was the most punctual of the 4 airlines on the route at 80.1%, while Southwest Airlines trailed at 63.0%.
February has been the best month (81% on time) and Monday the weakest day of the week (71%).
1.2% of flights were cancelled, versus 1.8% nationally.
DEN 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 | 80.1% | 66 min | 0.5% | 952 |
| American Airlines | 79.3% | 108 min | 1.6% | 903 |
| Frontier Airlines | 66.2% | 95 min | 3.0% | 296 |
| Southwest Airlines | 63.0% | 56 min | 0.8% | 879 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly DEN to PHL
On-time arrival % by scheduled departure hour (local time), 6,019 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 20 | |
| 6am–7am | 88.5% | 2.1% | 142 |
| 7am–8am | 88.5% | 2.5% | 392 |
| 8am–9am | 85.5% | 2.8% | 284 |
| 9am–10am | 82.3% | 0.6% | 330 |
| 10am–11am | 82.4% | 0.1% | 895 |
| 11am–12pm | 79.3% | 1.1% | 275 |
| 12pm–1pm | 72.2% | 0.7% | 590 |
| 1pm–2pm | 76.0% | 0.7% | 308 |
| 2pm–3pm | 64.8% | 1.0% | 389 |
| 3pm–4pm | 70.2% | 0.0% | 57 |
| 4pm–5pm | 52.2% | 2.1% | 94 |
| 5pm–6pm | 67.7% | 0.7% | 929 |
| 6pm–7pm | 56.9% | 0.9% | 227 |
| 7pm–8pm | 42.7% | 1.3% | 228 |
| 8pm–9pm | Limited data | 13 | |
| 11pm–12am | 72.0% | 1.6% | 846 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on DEN 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) | 73.4% | -2.7 pts | 0.0% | 109 |
| Christmas & New Year (Dec 20 - Jan 3) | 77.0% | +0.9 pts | 1.6% | 256 |
| Summer peak (Jun 15 - Aug 15) | 64.8% | -11.2 pts | 1.8% | 1,300 |
| All other days | 76.0% | — | 0.9% | 4,354 |
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).