MIA to ORD flight delays & on-time performance
Nonstop flights from Miami International Airport to Chicago O'Hare International Airport · 1,197 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at MIA or ORD right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Miami (MIA) to Chicago (ORD) arrived on time 71% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2% were cancelled, and 11% arrived an hour or more late.
- American Airlines was the most punctual airline here (72% on time); Spirit Airlines was the least (63%).
- Departures scheduled around 6am did best (89% on time); around 4pm did worst (54%).
- Tuesday was the most reliable day to fly (77% on time) and Sunday the least (63%).
- The largest source of delay minutes was air traffic control & airport congestion (35%).
Which airline is most on time from MIA to ORD?
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 |
|---|---|---|---|---|---|
| Frontier Airlines | 73% | 2.2% | 49 min | 13.3% | 46 |
| American Airlines | 72% | 1.9% | 22 min | 10.9% | 3,017 |
| United Airlines | 70% | 1.0% | 27 min | 12.1% | 1,070 |
| Spirit Airlines | 63% | 6.6% | 24 min | 12.3% | 317 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am89%350 flights
- 7am82%184 flights
- 8am88%344 flights
- 9am86%360 flights
- 12pm80%432 flights
- 1pm74%184 flights
- 2pm73%240 flights
- 3pm60%345 flights
- 4pm54%449 flights
- 5pm55%444 flights
- 6pm58%173 flights
- 7pm58%148 flights
- 8pm61%292 flights
- 9pm72%203 flights
- 10pm75%198 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday67%4.2% cancelled
- Tuesday77%1.3% cancelled
- Wednesday77%0.8% cancelled
- Thursday73%1.4% cancelled
- Friday69%1.4% cancelled
- Saturday74%1.3% cancelled
- Sunday63%3.5% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Air traffic control & airport congestion35%
- Late-arriving aircraft33%
- Airline (crew, maintenance, cleaning, fueling)25%
- Extreme weather7%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather81%
- Air traffic control & airport congestion10%
- Airline (crew, maintenance, cleaning, fueling)9%
- Security0%
MIA to ORD: common questions
- How often are MIA to ORD flights on time?
- 71% 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 Miami to Chicago cancelled?
- 2.0% of scheduled flights were cancelled (89 of 4,450).
- How long are typical delays?
- Across all flights the average arrival delay was 24 min (early arrivals count as zero). Flights that were late arrived 78 min behind schedule on average, and 11.3% of flights were an hour or more late.
- How long is taxi time at MIA?
- Flights on this route spent 22 min taxiing from the gate to takeoff on average.
Related routes
Return trip: ORD to MIA — 74% on time
More flights from Miami
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: MIA → ORD, nonstop flights by US airlines that report to the DOT. How we calculate this.