Miami (MIA) to Chicago (ORD): On-Time Performance
Data through July 2026
Miami (MIA) to Chicago (ORD) effectively runs on two schedules. In October 2024, 91% of arrivals were on time; in July 2025 that fell to 56% — a 35-point seasonal swing. Across the full period the route averages 73% on-time against a national 78%. Morning departures also hold up better than evening ones (87% vs 65%), which matters most in the rough months.
- On-time
- 73%
- arrived <15 min late
- Avg delay
- 20 min
- completed flights
- Cancelled
- 1.4%
- Flights/day
- 12
- last 12 months
- Duration
- 3h 31m
- scheduled
- Distance
- 1,197 mi
Best airline from MIA to ORD
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| American Airlinesmost reliable | 74% | 19 min | 1.4% | 6,262 |
| United Airlines | 72% | 22 min | 0.6% | 2,044 |
| Spirit Airlines | 72% | 20 min | 3.2% | 772 |
Monthly on-time trend
Best time to fly from MIA to ORD
Aim for departures around 6 a.m. (89% on-time); avoid 6 p.m. departures (55%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 71% | 25 min |
| Tuesdaybest | 80% | 14 min |
| Wednesday | 76% | 17 min |
| Thursday | 74% | 20 min |
| Friday | 72% | 20 min |
| Saturday | 76% | 18 min |
| Sunday | 67% | 27 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft34%
- Airline operations27%
- National airspace system32%
- Weather7%
Frequently asked questions
- How often are flights from MIA to ORD delayed?
- 27% of MIA–ORD 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 20 minutes.
- Which airline is most reliable from MIA to ORD?
- American Airlines has the best on-time record on this route at 74%, based on 6,262 flights. 3 airlines flew MIA–ORD frequently enough to compare in this period.
- What is the best time of day to fly from MIA to ORD?
- Departures around 6 a.m. have the best record (89% on-time), while departures around 6 p.m. have the worst (55%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from MIA to ORD?
- The scheduled MIA–ORD flight time averages 3h 31m over 1,197 miles. Actual arrival times vary — flights on this route land 15+ minutes late 27% of the time.
- How often are MIA to ORD flights cancelled?
- 1.4% 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 MIA to ORD?
- July 2025 was the roughest month in this dataset, with only 56% of arrivals on time. The best was October 2024 at 91%. If your dates are flexible, that 35-point gap is worth planning around.
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Based on 9,124 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.