72% of flights from Chicago to Miami arrived on time over the past 12 months. That is worse than the typical U.S. route. 9% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for MDW → MIA: when a flight was late, it was under 45 minutes late 62% of the time. About 1 in 14 flights landed an hour or more late, and 1 in 126 three hours or more; 1.2% were cancelled outright.
- On time or early72%
- 15–30 min late11%
- 30–60 min late7.9%
- 1–2 hours late4.8%
- 2–3 hours late1.8%
- 3+ hours late0.8%
- Diverted0.4%
- Cancelled1.2%
Share of all 505 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Southwest Airlines | 441 | 72% | 1.1% | +1 min | 6.3% | +49 min | Southwest Airlines |
| Frontier Airlines | 64 | — | — | — | — | — | Frontier Airlines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at MDW). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Southwest Airlines |
|---|---|
| 8 a.m. | 72% |
By month
Each calendar month pooled over 2023–2026. Best: October (86%). Worst: January (62%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 79 | — | — |
| Tuesday | 44 | — | — |
| Wednesday | 48 | — | — |
| Thursday | 75 | — | — |
| Friday | 75 | — | — |
| Saturday | 104 | 62% | 1.9% |
| Sunday | 80 | — | — |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 5 · air traffic/airport 1
Month by month
Not enough months with data to draw a trend.
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Mar 16, 2026 | 3 | 0% | 1 |
| Nov 29, 2025 | 3 | 0% | 2 |
| Dec 27, 2025 | 3 | 33% | 0 |
| Mar 22, 2026 | 3 | 33% | 0 |
| Jan 3, 2026 | 3 | 33% | 0 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of Chicago or Miami. None has been clearly more reliable than MDW → MIA.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| MDW → MIA (this route) | 505 | 72% | 1.2% |
| MDW → FLL Chicago Midway to Fort Lauderdale | 1,119 | 73% | 1.4% |
| ORD → MIA Chicago O'Hare to Miami | 4,465 | 72% | 1.9% |
| ORD → FLL Chicago O'Hare to Fort Lauderdale | 3,517 | 69% | 2.3% |
Questions
How often are flights from MDW to MIA on time?
72% of 505 scheduled flights from Chicago, IL to Miami, FL arrived within 15 minutes of schedule between September 2025 and August 2026. 1.2% were cancelled.
What month has the most delays from MDW to MIA?
January (62% on time). The best month is October (86%), over 2023–2026.
Related
- MIA → MDW (return)
- Chicago Midway (MDW) delays by hour
- Flights into Miami (MIA)
- Southwest Airlines on-time record
- Frontier Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.