Best Time to Fly PHL to MDW: On-Time Stats by Hour & Airline
Philadelphia International → Chicago Midway International
Data through July 2026 · Last updated October 18, 2026
1,524 flights were scheduled from Philadelphia (PHL) to Chicago (MDW) in the last 12 months, and 74.8% of those that flew arrived on time, 2.9 points below the US average of 77.6%.
Frontier Airlines was the most punctual of the 2 airlines on the route at 83.8%, while Southwest Airlines trailed at 74.3%.
September has been the best month (85% on time) and Sunday the weakest day of the week (70%).
1.7% of flights were cancelled, versus 1.8% nationally.
PHL to MDW 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 |
|---|---|---|---|---|
| Frontier Airlines | 83.8% | 71 min | 1.4% | 69 |
| Southwest Airlines | 74.3% | 71 min | 1.7% | 1,455 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PHL to MDW
On-time arrival % by scheduled departure hour (local time), 3,193 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 87.8% | 1.7% | 235 |
| 6am–7am | 85.9% | 0.4% | 264 |
| 7am–8am | 90.7% | 0.9% | 229 |
| 8am–9am | 88.9% | 0.0% | 54 |
| 9am–10am | 84.8% | 2.9% | 35 |
| 10am–11am | 83.6% | 0.0% | 110 |
| 11am–12pm | 86.9% | 2.1% | 242 |
| 12pm–1pm | 82.9% | 1.0% | 409 |
| 1pm–2pm | 79.6% | 1.5% | 204 |
| 2pm–3pm | 75.0% | 2.0% | 152 |
| 3pm–4pm | 77.6% | 1.8% | 109 |
| 4pm–5pm | 68.0% | 0.6% | 182 |
| 5pm–6pm | 55.0% | 0.4% | 225 |
| 6pm–7pm | 58.3% | 2.0% | 345 |
| 7pm–8pm | 47.1% | 2.0% | 197 |
| 8pm–9pm | 55.9% | 2.9% | 105 |
| 9pm–10pm | 70.6% | 0.0% | 51 |
| 10pm–11pm | 69.8% | 4.4% | 45 |
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 MDW
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) | 76.1% | -1.8 pts | 2.8% | 71 |
| Christmas & New Year (Dec 20 - Jan 3) | 64.6% | -13.4 pts | 0.0% | 127 |
| Summer peak (Jun 15 - Aug 15) | 64.8% | -13.1 pts | 2.4% | 622 |
| All other days | 77.9% | — | 1.1% | 2,373 |
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).