Best Time to Fly BOS to MIA: On-Time Stats by Hour & Airline
Logan International → Miami International
Data through July 2026 · Last updated October 18, 2026
3,384 flights were scheduled from Boston (BOS) to Miami (MIA) in the last 12 months, and 78.5% of those that flew arrived on time, 0.8 points above the US average of 77.6%.
American Airlines was the most punctual of the 4 airlines on the route at 82.8%, while Spirit Airlines trailed at 54.6%.
November has been the best month (86% on time) and Sunday the weakest day of the week (72%).
2.1% of flights were cancelled, versus 1.8% nationally.
BOS 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 |
|---|---|---|---|---|
| American Airlines | 82.8% | 73 min | 1.7% | 2,252 |
| JetBlue | 80.0% | 24 min | 0.0% | 35 |
| Delta Air Lines | 72.9% | 78 min | 2.6% | 891 |
| Spirit Airlines | 54.6% | 82 min | 6.0% | 185 |
| Republic Airways | Limited data | 21 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly BOS to MIA
On-time arrival % by scheduled departure hour (local time), 7,363 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.3% | 1.8% | 730 |
| 6am–7am | 90.5% | 1.5% | 727 |
| 7am–8am | 87.3% | 1.8% | 1,376 |
| 8am–9am | 82.8% | 1.3% | 537 |
| 9am–10am | 84.2% | 1.5% | 196 |
| 10am–11am | 75.2% | 1.6% | 384 |
| 11am–12pm | 73.5% | 0.7% | 138 |
| 12pm–1pm | 78.2% | 0.7% | 441 |
| 1pm–2pm | 74.8% | 0.7% | 305 |
| 2pm–3pm | 64.9% | 0.0% | 134 |
| 3pm–4pm | 65.2% | 1.8% | 827 |
| 4pm–5pm | 58.8% | 1.1% | 368 |
| 5pm–6pm | 72.5% | 3.0% | 303 |
| 6pm–7pm | 68.3% | 2.3% | 643 |
| 7pm–8pm | 63.2% | 3.4% | 177 |
| 8pm–9pm | 57.8% | 5.3% | 75 |
| 9pm–10pm | Limited data | 1 | |
| 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 BOS 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) | 79.1% | -0.3 pts | 0.0% | 134 |
| Christmas & New Year (Dec 20 - Jan 3) | 68.0% | -11.4 pts | 3.5% | 340 |
| Summer peak (Jun 15 - Aug 15) | 76.7% | -2.7 pts | 2.5% | 1,142 |
| All other days | 79.4% | — | 1.4% | 5,747 |
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).