Best Time to Fly PHL to ORD: On-Time Stats by Hour & Airline
Philadelphia International → Chicago O'Hare International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 73.3% of Philadelphia (PHL) to Chicago (ORD) flights arrived on time (5,002 scheduled flights). That is 4.3 points below the national average of 77.6%.
Among 3 airlines, American Airlines led with 73.9% on time and Frontier Airlines was last with 57.4%.
Over 24 months, Tuesday was the most reliable day (82% on time) and July the worst month (63%).
The cancellation rate was 3.4% (US average 1.8%).
PHL to ORD 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 |
|---|---|---|---|---|
| American Airlines | 73.9% | 98 min | 4.0% | 2,973 |
| United Airlines | 73.7% | 102 min | 2.2% | 1,810 |
| Frontier Airlines | 57.4% | 127 min | 5.2% | 193 |
| Republic Airways | Limited data | 26 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PHL to ORD
On-time arrival % by scheduled departure hour (local time), 9,482 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 91.2% | 3.0% | 165 |
| 6am–7am | 89.7% | 2.7% | 901 |
| 7am–8am | 85.1% | 3.6% | 690 |
| 8am–9am | 79.3% | 3.0% | 435 |
| 9am–10am | 83.6% | 1.6% | 577 |
| 10am–11am | 84.1% | 1.6% | 1,205 |
| 11am–12pm | 82.0% | 1.2% | 242 |
| 12pm–1pm | 79.1% | 1.7% | 842 |
| 1pm–2pm | 78.7% | 1.6% | 571 |
| 2pm–3pm | 77.9% | 1.9% | 259 |
| 3pm–4pm | 63.7% | 2.4% | 422 |
| 4pm–5pm | 67.8% | 1.7% | 591 |
| 5pm–6pm | 60.5% | 2.0% | 791 |
| 6pm–7pm | 56.2% | 3.6% | 858 |
| 7pm–8pm | 59.0% | 4.8% | 334 |
| 8pm–9pm | 51.2% | 2.4% | 42 |
| 9pm–10pm | 69.1% | 5.7% | 442 |
| 10pm–11pm | 81.8% | 10.2% | 49 |
| 11pm–12am | 63.8% | 12.1% | 66 |
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 ORD
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) | 66.5% | -12.0 pts | 5.8% | 171 |
| Christmas & New Year (Dec 20 - Jan 3) | 70.7% | -7.8 pts | 1.3% | 311 |
| Summer peak (Jun 15 - Aug 15) | 64.2% | -14.3 pts | 5.5% | 1,795 |
| All other days | 78.4% | — | 1.9% | 7,205 |
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).