Best Time to Fly MDW to PHX: On-Time Stats by Hour & Airline
Chicago Midway International → Phoenix Sky Harbor International
Data through July 2026 · Last updated October 18, 2026
2,738 flights were scheduled from Chicago (MDW) to Phoenix (PHX) in the last 12 months, and 75.7% of those that flew arrived on time, 1.9 points below the US average of 77.6%.
Among 2 airlines, Frontier Airlines led with 77.6% on time and Southwest Airlines was last with 75.6%.
Over 24 months, Saturday was the most reliable day (82% on time) and June the worst month (67%).
The cancellation rate was 1.6% (US average 1.8%).
MDW to PHX 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 | 77.6% | 153 min | 1.7% | 118 |
| Southwest Airlines | 75.6% | 52 min | 1.6% | 2,620 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MDW to PHX
On-time arrival % by scheduled departure hour (local time), 5,694 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 95.4% | 0.8% | 524 |
| 6am–7am | 89.9% | 0.5% | 189 |
| 7am–8am | 86.3% | 0.6% | 493 |
| 8am–9am | 89.9% | 0.9% | 439 |
| 9am–10am | 85.3% | 1.0% | 296 |
| 10am–11am | 87.6% | 2.1% | 281 |
| 11am–12pm | 77.5% | 1.1% | 348 |
| 12pm–1pm | 82.9% | 1.6% | 257 |
| 1pm–2pm | 78.8% | 0.7% | 281 |
| 2pm–3pm | 74.5% | 1.8% | 285 |
| 3pm–4pm | 73.8% | 0.0% | 286 |
| 4pm–5pm | 69.7% | 1.5% | 337 |
| 5pm–6pm | 72.5% | 1.9% | 373 |
| 6pm–7pm | 61.8% | 1.6% | 308 |
| 7pm–8pm | 65.4% | 0.8% | 262 |
| 8pm–9pm | 68.5% | 1.1% | 347 |
| 9pm–10pm | 60.1% | 1.8% | 227 |
| 10pm–11pm | 62.3% | 1.2% | 161 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MDW to PHX
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) | 75.5% | -4.7 pts | 6.0% | 117 |
| Christmas & New Year (Dec 20 - Jan 3) | 70.1% | -10.0 pts | 0.4% | 253 |
| Summer peak (Jun 15 - Aug 15) | 72.0% | -8.2 pts | 1.9% | 917 |
| All other days | 80.2% | — | 0.9% | 4,407 |
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).