ORD to MIA flight delays & on-time performance
Nonstop flights from Chicago O'Hare International Airport to Miami International Airport · 1,197 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ORD or MIA right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Chicago (ORD) to Miami (MIA) arrived on time 74% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2% were cancelled, and 9% arrived an hour or more late.
- American Airlines was the most punctual airline here (76% on time); Spirit Airlines was the least (60%).
- Departures scheduled around 5am did best (93% on time); around 4pm did worst (53%).
- Wednesday was the most reliable day to fly (80% on time) and Sunday the least (65%).
- The largest source of delay minutes was late-arriving aircraft (40%).
Which airline is most on time from ORD to MIA?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| American Airlines | 76% | 1.9% | 19 min | 9.0% | 3,017 |
| United Airlines | 74% | 0.7% | 17 min | 8.1% | 1,071 |
| Frontier Airlines | 64% | 2.2% | 43 min | 13.3% | 46 |
| Spirit Airlines | 60% | 6.6% | 29 min | 15.5% | 318 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am93%364 flights
- 6am89%347 flights
- 7am83%602 flights
- 8am76%427 flights
- 9am71%231 flights
- 10am74%659 flights
- 12pm75%254 flights
- 1pm72%69 flights
- 2pm66%267 flights
- 3pm74%149 flights
- 4pm53%257 flights
- 5pm62%219 flights
- 6pm54%307 flights
- 7pm66%260 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday74%3.4% cancelled
- Tuesday80%1.8% cancelled
- Wednesday80%1.5% cancelled
- Thursday76%1.1% cancelled
- Friday72%1.8% cancelled
- Saturday71%1.1% cancelled
- Sunday65%2.9% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft40%
- Airline (crew, maintenance, cleaning, fueling)30%
- Air traffic control & airport congestion25%
- Extreme weather5%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather82%
- Air traffic control & airport congestion10%
- Airline (crew, maintenance, cleaning, fueling)8%
- Security0%
ORD to MIA: common questions
- How often are ORD to MIA flights on time?
- 74% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Chicago to Miami cancelled?
- 2.0% of scheduled flights were cancelled (87 of 4,452).
- How long are typical delays?
- Across all flights the average arrival delay was 20 min (early arrivals count as zero). Flights that were late arrived 72 min behind schedule on average, and 9.3% of flights were an hour or more late.
- How long is taxi time at ORD?
- Flights on this route spent 23 min taxiing from the gate to takeoff on average.
Related routes
Return trip: MIA to ORD — 71% on time
More flights from Chicago
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: ORD → MIA, nonstop flights by US airlines that report to the DOT. How we calculate this.