Chicago (MDW) to Miami (MIA): On-Time Performance
Data through July 2026
When you fly MDW to MIA matters as much as anything else about the booking: the route swung from 96% on-time in October 2025 to just 61% in July 2026. Across the full period the route averages 74% on-time against a national 78%.
- On-time
- 74%
- arrived <15 min late
- Avg delay
- 18 min
- completed flights
- Cancelled
- 1.2%
- Flights/day
- 1.4
- last 12 months
- Duration
- 3h 3m
- scheduled
- Distance
- 1,182 mi
Best airline from MDW to MIA
2 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Southwest Airlinesmost reliable | 75% | 15 min | 0.5% | 956 |
| Frontier Airlines | 71% | 26 min | 3.9% | 254 |
Monthly on-time trend
Best time to fly from MDW to MIA
Aim for departures around 9 a.m. (86% on-time); avoid 3 p.m. departures (44%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 77% | 20 min |
| Tuesdaybest | 87% | 16 min |
| Wednesday | 77% | 21 min |
| Thursday | 70% | 15 min |
| Friday | 71% | 21 min |
| Saturday | 74% | 13 min |
| Sunday | 68% | 19 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft38%
- Airline operations35%
- National airspace system25%
- Weather1%
Frequently asked questions
- How often are flights from MDW to MIA delayed?
- 26% of MDW–MIA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 18 minutes.
- Which airline is most reliable from MDW to MIA?
- Southwest Airlines has the best on-time record on this route at 75%, based on 956 flights. 2 airlines flew MDW–MIA frequently enough to compare in this period.
- What is the best time of day to fly from MDW to MIA?
- Departures around 9 a.m. have the best record (86% on-time), while departures around 3 p.m. have the worst (44%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MDW to MIA?
- The scheduled MDW–MIA flight time averages 3h 3m over 1,182 miles. Actual arrival times vary — flights on this route land 15+ minutes late 26% of the time.
- How often are MDW to MIA flights cancelled?
- 1.2% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from MDW to MIA?
- July 2026 was the roughest month in this dataset, with only 61% of arrivals on time. The best was October 2025 at 96%. If your dates are flexible, that 35-point gap is worth planning around.
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Based on 1,210 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.