NK821
NK821 (Spirit Airlines) is a multi-stop service on 4 routes, busiest Detroit to Houston. Of 149 departures recorded from January 2025 to January 2026, 79.5% left on time, according to the US BTS.
- On-time departures79.5%of 149 flights
- Average delay15.0 min
- January 20266▼ 57.1%vs January 2025
- Cancelled2.0%
- Legs flown under this number4
Recorded departures by month
Short series — NK821 has only 9 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 periods9 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 14 | 6 | ▼ 57.1% |
| February | 23 | – | – |
| March | 31 | – | – |
| April | 30 | – | – |
| May | 6 | – | – |
| June | – | – | – |
| July | – | – | – |
| August | – | – | – |
| September | 8 | – | – |
| October | 8 | – | in progress |
| November | – | – | – |
| December | 23 | – | – |
| Year to date (Jan–Jan) | 14 | 6 | ▼ 57.1% |
according to the US BTS · January 2025 → January 2026
On-time departures by month
Short series — NK821 has only 9 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 periods9 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 84.6% | 25.0% | ▼ 70.5% |
| February | 78.3% | – | – |
| March | 83.9% | – | – |
| April | 80.0% | – | – |
| May | 83.3% | – | – |
| June | – | – | – |
| July | – | – | – |
| August | – | – | – |
| September | 87.5% | – | – |
| October | 87.5% | – | in progress |
| November | – | – | – |
| December | 73.9% | – | – |
| Year-to-date average (Jan–Jan) | 84.6% | 25.0% | ▼ 70.5% |
according to the US BTS · January 2025 → January 2026
Average departure delay by month
Short series — NK821 has only 9 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 — NK821 has only 9 months so far. Enough to show the level now, not enough to read a trend.
Months without data are left blank.
The most recent periods9 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 1 | 2 | ▲ 100.0% |
| February | 0 | – | – |
| March | 0 | – | – |
| April | 0 | – | – |
| May | 0 | – | – |
| June | – | – | – |
| July | – | – | – |
| August | – | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | – | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jan) | 1 | 2 | ▲ 100.0% |
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 98.0% 146
- Cancelled 2.0% 3
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
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DTW IAH Detroit Metropolitan Wayne County Airport – George Bush Intercontinental Airport | 1,731 | 13.2 min | 81.0% | 63 |
| MSY DTW Louis Armstrong New Orleans International Airport – Detroit Metropolitan Wayne County Airport | 1,493 | 7.2 min | 82.5% | 41 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| January 2025 | 14 | 13 | 84.6% | 1 |
| February 2025 | 23 | 23 | 78.3% | 0 |
| March 2025 | 31 | 31 | 83.9% | 0 |
| April 2025 | 30 | 30 | 80.0% | 0 |
| May 2025 | 6 | 6 | 83.3% | 0 |
| September 2025 | 8 | 8 | 87.5% | 0 |
| October 2025 | 8 | 8 | 87.5% | 0 |
| December 2025 | 23 | 23 | 73.9% | 0 |
| January 2026 | 6 | 4 | 25.0% | 2 |