Best Time to Fly MDW to MIA: On-Time Stats by Hour & Airline
Chicago Midway International → Miami International
Data through July 2026 · Last updated October 18, 2026
503 flights were scheduled from Chicago (MDW) to Miami (MIA) in the last 12 months, and 72.9% of those that flew arrived on time, 4.8 points below the US average of 77.6%.
Frontier Airlines was the most punctual of the 2 airlines on the route at 74.6%, while Southwest Airlines trailed at 72.6%.
October has been the best month (89% on time) and Sunday the weakest day of the week (69%).
1.2% of flights were cancelled, versus 1.8% nationally.
MDW to MIA 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 | 74.6% | 81 min | 1.6% | 64 |
| Southwest Airlines | 72.6% | 48 min | 1.1% | 439 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MDW to MIA
On-time arrival % by scheduled departure hour (local time), 1,144 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 6am–7am | 78.6% | 0.0% | 56 |
| 7am–8am | 76.5% | 1.4% | 138 |
| 8am–9am | 70.4% | 0.0% | 196 |
| 9am–10am | 86.1% | 1.0% | 204 |
| 10am–11am | Limited data | 8 | |
| 11am–12pm | 71.7% | 0.0% | 60 |
| 12pm–1pm | 77.3% | 0.0% | 44 |
| 1pm–2pm | 78.4% | 0.0% | 38 |
| 2pm–3pm | 66.1% | 1.6% | 63 |
| 3pm–4pm | Limited data | 21 | |
| 4pm–5pm | Limited data | 7 | |
| 5pm–6pm | 75.6% | 1.1% | 87 |
| 6pm–7pm | 71.2% | 0.9% | 105 |
| 7pm–8pm | 74.1% | 3.6% | 56 |
| 8pm–9pm | 67.2% | 1.7% | 59 |
| 9pm–10pm | Limited data | 2 | |
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 MIA
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) | Limited data | 25 | ||
| Christmas & New Year (Dec 20 - Jan 3) | 52.6% | -25.0 pts | 0.0% | 57 |
| Summer peak (Jun 15 - Aug 15) | 66.4% | -11.2 pts | 1.3% | 150 |
| All other days | 77.6% | — | 0.8% | 912 |
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).