Chicago (ORD) to Miami (MIA): On-Time Performance
Data through July 2026
Chicago (ORD) to Miami (MIA) effectively runs on two schedules. In October 2024, 91% of arrivals were on time; in March 2026 that fell to 65% — a 27-point seasonal swing. Across the full period the route averages 76% on-time against a national 78%. Morning departures also hold up better than evening ones (83% vs 66%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 17 min
- completed flights
- Cancelled
- 1.4%
- Flights/day
- 12
- last 12 months
- Duration
- 3h 14m
- scheduled
- Distance
- 1,197 mi
Best airline from ORD to MIA
3 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 78% | 14 min | 0.4% | 2,046 |
| American Airlines | 77% | 17 min | 1.4% | 6,265 |
| Spirit Airlines | 70% | 21 min | 3.9% | 775 |
Monthly on-time trend
Best time to fly from ORD to MIA
Aim for departures around 5 a.m. (92% on-time); avoid 9 p.m. departures (53%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 19 min |
| Tuesdaybest | 82% | 12 min |
| Wednesday | 81% | 14 min |
| Thursday | 77% | 15 min |
| Friday | 74% | 17 min |
| Saturday | 75% | 18 min |
| Sunday | 70% | 24 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft39%
- Airline operations29%
- National airspace system27%
- Weather5%
Frequently asked questions
- How often are flights from ORD to MIA delayed?
- 24% of ORD–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 17 minutes.
- Which airline is most reliable from ORD to MIA?
- United Airlines has the best on-time record on this route at 78%, based on 2,046 flights. 3 airlines flew ORD–MIA frequently enough to compare in this period.
- What is the best time of day to fly from ORD to MIA?
- Departures around 5 a.m. have the best record (92% on-time), while departures around 9 p.m. have the worst (53%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ORD to MIA?
- The scheduled ORD–MIA flight time averages 3h 14m over 1,197 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are ORD to MIA 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 ORD to MIA?
- March 2026 was the roughest month in this dataset, with only 65% of arrivals on time. The best was October 2024 at 91%. If your dates are flexible, that 27-point gap is worth planning around.
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Based on 9,132 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.