Best Time to Fly FLL to BOS: On-Time Stats by Hour & Airline
Fort Lauderdale-Hollywood International → Logan International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 66.9% of Fort Lauderdale (FLL) to Boston (BOS) flights arrived on time (3,347 scheduled flights). That is 10.7 points below the national average of 77.6%.
Delta Air Lines was the most punctual of the 3 airlines on the route at 72.4%, while Spirit Airlines trailed at 61.4%.
November has been the best month (82% on time) and Sunday the weakest day of the week (65%).
3.5% of flights were cancelled, versus 1.8% nationally.
FLL to BOS 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 |
|---|---|---|---|---|
| Delta Air Lines | 72.4% | 79 min | 3.2% | 885 |
| JetBlue | 65.8% | 77 min | 3.1% | 1,953 |
| Spirit Airlines | 61.4% | 75 min | 5.3% | 509 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly FLL to BOS
On-time arrival % by scheduled departure hour (local time), 6,820 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 2 | |
| 6am–7am | 90.8% | 0.7% | 570 |
| 7am–8am | 85.3% | 1.6% | 776 |
| 8am–9am | 90.1% | 1.1% | 378 |
| 9am–10am | 77.9% | 0.8% | 132 |
| 10am–11am | 81.5% | 0.4% | 239 |
| 11am–12pm | 70.0% | 1.5% | 741 |
| 12pm–1pm | 65.1% | 1.8% | 395 |
| 1pm–2pm | 59.2% | 3.6% | 249 |
| 2pm–3pm | 62.7% | 4.7% | 256 |
| 3pm–4pm | 57.6% | 3.8% | 184 |
| 4pm–5pm | 54.6% | 2.3% | 398 |
| 5pm–6pm | 53.2% | 2.5% | 277 |
| 6pm–7pm | 61.1% | 3.8% | 238 |
| 7pm–8pm | 60.2% | 2.0% | 455 |
| 8pm–9pm | 64.4% | 2.8% | 1,347 |
| 9pm–10pm | 53.9% | 7.1% | 154 |
| 10pm–11pm | Limited data | 29 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on FLL to BOS
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) | 77.6% | +5.3 pts | 2.7% | 147 |
| Christmas & New Year (Dec 20 - Jan 3) | 58.2% | -14.1 pts | 3.7% | 403 |
| Summer peak (Jun 15 - Aug 15) | 59.1% | -13.2 pts | 3.5% | 880 |
| All other days | 72.3% | — | 1.9% | 5,390 |
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).