NK399
NK399 (Spirit Airlines) is a multi-stop service on 3 routes, busiest Fort Lauderdale to Boston. Of 147 departures recorded from January 2025 to January 2026, 87.2% left on time, according to the US BTS.
- On-time departures87.2%of 147 flights
- Average delay12.8 min
- January 20267▼ 69.6%vs January 2025
- Cancelled4.1%
- Legs flown under this number3
Recorded departures by month
Short series — NK399 has only 7 months so far. Enough to show the level now, not enough to read a trend.
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods7 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 23 | 7 | ▼ 69.6% |
| February | 23 | – | – |
| March | 30 | – | – |
| April | 30 | – | – |
| May | 6 | – | – |
| June | – | – | – |
| July | – | – | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | – | – | – |
| December | 28 | – | – |
| Year to date (Jan–Jan) | 23 | 7 | ▼ 69.6% |
according to the US BTS · January 2025 → January 2026
On-time departures by month
Short series — NK399 has only 7 months so far. Enough to show the level now, not enough to read a trend.
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods7 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 87.0% | 80.0% | ▼ 8.0% |
| February | 81.8% | – | – |
| March | 93.3% | – | – |
| April | 90.0% | – | – |
| May | 100.0% | – | – |
| June | – | – | – |
| July | – | – | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | – | – | – |
| December | 80.0% | – | – |
| Year-to-date average (Jan–Jan) | 87.0% | 80.0% | ▼ 8.0% |
according to the US BTS · January 2025 → January 2026
Average departure delay by month
Short series — NK399 has only 7 months so far. Enough to show the level now, not enough to read a trend.
Months without data are left blank.
according to the US BTS · January 2025 → January 2026
Cancelled departures by month
Short series — NK399 has only 7 months so far. Enough to show the level now, not enough to read a trend.
Months without data are left blank.
The most recent periods7 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 2 | – |
| February | 1 | – | – |
| March | 0 | – | – |
| April | 0 | – | – |
| May | 0 | – | – |
| June | – | – | – |
| July | – | – | – |
| August | – | – | – |
| September | – | – | – |
| October | – | – | in progress |
| November | – | – | – |
| December | 3 | – | – |
| Year to date (Jan–Jan) | 0 | 2 |
according to the US BTS · January 2025 → January 2026
This is a historical record of departures already flown, not a forecast for your flight.
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 95.9% 141
- Cancelled 4.1% 6
Share of all recorded flights in the period, all legs. · Jan 9, 2025 → Jan 7, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
3| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| FLL BOS Fort Lauderdale Hollywood International Airport – Boston Logan International Airport | 1,994 | 6.0 min | 93.7% | 63 |
| PHL MIA Philadelphia International Airport – Miami International Airport | 1,634 | 17.8 min | 83.3% | 49 |
| DFW LGA Dallas Fort Worth International Airport – LaGuardia Airport | 2,231 | 19.2 min | 80.0% | 35 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| January 2025 | 23 | 23 | 87.0% | 0 |
| February 2025 | 23 | 22 | 81.8% | 1 |
| March 2025 | 30 | 30 | 93.3% | 0 |
| April 2025 | 30 | 30 | 90.0% | 0 |
| May 2025 | 6 | 6 | 100.0% | 0 |
| December 2025 | 28 | 25 | 80.0% | 3 |
| January 2026 | 7 | 5 | 80.0% | 2 |