Best Time to Fly PHX to MDW: On-Time Stats by Hour & Airline
Phoenix Sky Harbor International → Chicago Midway International
Data through July 2026 · Last updated October 18, 2026
2,757 flights were scheduled from Phoenix (PHX) to Chicago (MDW) in the last 12 months, and 71.7% of those that flew arrived on time, 5.9 points below the US average of 77.6%.
Among 2 airlines, Southwest Airlines led with 71.9% on time and Frontier Airlines was last with 67.2%.
Over 24 months, Wednesday was the most reliable day (81% on time) and July the worst month (66%).
The cancellation rate was 1.1% (US average 1.8%).
PHX 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 |
|---|---|---|---|---|
| Southwest Airlines | 71.9% | 48 min | 1.1% | 2,639 |
| Frontier Airlines | 67.2% | 84 min | 1.7% | 118 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PHX to MDW
On-time arrival % by scheduled departure hour (local time), 5,709 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.1% | 0.0% | 510 |
| 6am–7am | 93.3% | 1.2% | 335 |
| 7am–8am | 90.0% | 0.5% | 385 |
| 8am–9am | 88.2% | 0.7% | 443 |
| 9am–10am | 84.6% | 1.1% | 264 |
| 10am–11am | 78.7% | 0.3% | 316 |
| 11am–12pm | 81.1% | 0.3% | 283 |
| 12pm–1pm | 74.0% | 1.5% | 392 |
| 1pm–2pm | 77.0% | 0.0% | 209 |
| 2pm–3pm | 72.9% | 1.0% | 409 |
| 3pm–4pm | 65.3% | 0.6% | 472 |
| 4pm–5pm | 62.9% | 0.7% | 270 |
| 5pm–6pm | 63.4% | 1.0% | 398 |
| 6pm–7pm | 64.1% | 0.4% | 478 |
| 7pm–8pm | 61.7% | 1.7% | 296 |
| 8pm–9pm | 61.5% | 1.7% | 119 |
| 9pm–10pm | Limited data | 16 | |
| 11pm–12am | 77.2% | 0.0% | 114 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PHX 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) | 84.7% | +6.7 pts | 4.3% | 117 |
| Christmas & New Year (Dec 20 - Jan 3) | 74.5% | -3.5 pts | 0.0% | 252 |
| Summer peak (Jun 15 - Aug 15) | 69.3% | -8.7 pts | 0.6% | 936 |
| All other days | 78.0% | — | 0.7% | 4,404 |
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).