Best Time to Fly JFK to MIA: On-Time Stats by Hour & Airline
John F. Kennedy International → Miami International
Data through July 2026 · Last updated October 18, 2026
4,529 flights were scheduled from New York (JFK) to Miami (MIA) in the last 12 months, and 77.1% of those that flew arrived on time, 0.5 points below the US average of 77.6%.
Frontier Airlines was the most punctual of the 3 airlines on the route at 81.1%, while Delta Air Lines trailed at 76.2%.
November has been the best month (84% on time) and Sunday the weakest day of the week (69%).
2.9% of flights were cancelled, versus 1.8% nationally.
JFK to MIA on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Frontier Airlines | 81.1% | 96 min | 2.1% | 243 |
| American Airlines | 77.3% | 110 min | 2.7% | 2,665 |
| Delta Air Lines | 76.2% | 74 min | 3.3% | 1,621 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly JFK to MIA
On-time arrival % by scheduled departure hour (local time), 9,825 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 91.0% | 1.8% | 509 |
| 6am–7am | 86.4% | 2.5% | 814 |
| 7am–8am | 86.3% | 2.3% | 1,342 |
| 8am–9am | 78.5% | 2.2% | 229 |
| 9am–10am | 82.9% | 0.8% | 380 |
| 10am–11am | 75.7% | 3.9% | 203 |
| 11am–12pm | 77.2% | 1.4% | 1,269 |
| 12pm–1pm | 74.8% | 0.8% | 356 |
| 1pm–2pm | 70.1% | 1.8% | 546 |
| 2pm–3pm | 73.1% | 2.6% | 389 |
| 3pm–4pm | 68.7% | 1.9% | 861 |
| 4pm–5pm | 62.7% | 1.8% | 164 |
| 5pm–6pm | 69.5% | 2.3% | 833 |
| 6pm–7pm | 69.5% | 3.5% | 747 |
| 7pm–8pm | 64.1% | 3.0% | 744 |
| 8pm–9pm | 65.7% | 3.5% | 366 |
| 9pm–10pm | 59.4% | 11.1% | 72 |
| 10pm–11pm | Limited data | 1 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on JFK to MIA
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 77.2% | -1.1 pts | 1.1% | 191 |
| Christmas & New Year (Dec 20 - Jan 3) | 63.2% | -15.2 pts | 2.7% | 402 |
| Summer peak (Jun 15 - Aug 15) | 65.4% | -12.9 pts | 6.0% | 1,561 |
| All other days | 78.3% | — | 1.5% | 7,671 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).