66% of flights from Miami to Chicago arrived on time over the past 12 months. That is worse than the typical U.S. route. 13% 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 MIA → MDW: when a flight was late, it was under 45 minutes late 56% of the time. About 1 in 9 flights landed an hour or more late, and 1 in 39 three hours or more; 1.6% were cancelled outright.
- On time or early66%
- 15–30 min late12%
- 30–60 min late8.7%
- 1–2 hours late6.5%
- 2–3 hours late1.6%
- 3+ hours late2.6%
- Diverted1.0%
- Cancelled1.6%
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 | 65% | 1.6% | +2 min | 10.4% | +68 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 MIA). Delays build through the day as late planes knock on, so early flights usually do best.
By airline and hour
| Departs | Southwest Airlines |
|---|---|
| 6 a.m. | 79% |
By month
Each calendar month pooled over 2023–2026. Best: April (78%). Worst: August (51%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 79 | — | — |
| Tuesday | 44 | — | — |
| Wednesday | 48 | — | — |
| Thursday | 75 | — | — |
| Friday | 75 | — | — |
| Saturday | 104 | 56% | 3.9% |
| Sunday | 80 | — | — |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 6 · air traffic/airport 2
Month by month
Not enough months with data to draw a trend.
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Nov 29, 2025 | 3 | 0% | 2 |
| Mar 27, 2026 | 4 | 25% | 0 |
| Mar 14, 2026 | 4 | 25% | 0 |
| Mar 28, 2026 | 4 | 25% | 0 |
| Dec 20, 2025 | 3 | 33% | 0 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of Miami or Chicago. FLL → MDW has been 4 points more reliable.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| MIA → MDW (this route) | 505 | 66% | 1.6% |
| FLL → MDW Fort Lauderdale to Chicago Midway | 1,120 | 70% | 1.3% |
| MIA → ORD Miami to Chicago O'Hare | 4,464 | 69% | 1.9% |
| FLL → ORD Fort Lauderdale to Chicago O'Hare | 3,518 | 67% | 1.8% |
Questions
How often are flights from MIA to MDW on time?
66% of 505 scheduled flights from Miami, FL to Chicago, IL arrived within 15 minutes of schedule between September 2025 and August 2026. 1.6% were cancelled.
What month has the most delays from MIA to MDW?
August (51% on time). The best month is April (78%), over 2023–2026.
Related
- MDW → MIA (return)
- Miami (MIA) delays by hour
- Flights into Chicago Midway (MDW)
- 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.