WN999
WN999 (Southwest Airlines) is a multi-stop service on 30 routes, busiest Nashville to St Louis. Of 656 departures recorded from October 2024 to July 2026, 72.4% left on time, according to the US BTS.
- On-time departures72.4%of 656 flights
- Average delay18.1 min
- July 202646▲ 109.1%vs July 2025
- Cancelled2.1%
- Legs flown under this number30
according to the US BTS · Oct 12, 2024 → Jul 31, 2026 domestic flights only
Recorded departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
All legs under this number combined; see the leg table.
The most recent periods19 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 31 | 30 | ▼ 3.2% |
| February | 36 | 25 | ▼ 30.6% |
| March | 32 | 55 | ▲ 71.9% |
| April | 22 | 33 | ▲ 50.0% |
| May | 22 | 27 | ▲ 22.7% |
| June | 20 | 41 | ▲ 105.0% |
| July | 22 | 46 | ▲ 109.1% |
| August | 29 | – | – |
| September | 30 | – | – |
| October | 22 | – | in progress |
| November | 28 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 185 | 257 | ▲ 38.9% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods19 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 89.7% | ▼ 10.3% |
| February | 79.4% | 96.0% | ▲ 20.9% |
| March | 93.8% | 67.3% | ▼ 28.2% |
| April | 81.8% | 66.7% | ▼ 18.5% |
| May | 54.6% | 56.0% | ▲ 2.7% |
| June | 75.0% | 19.5% | ▼ 74.0% |
| July | 81.8% | 32.6% | ▼ 60.2% |
| August | 53.6% | – | – |
| September | 86.7% | – | – |
| October | 50.0% | – | in progress |
| November | 100.0% | – | – |
| December | 89.7% | – | – |
| Year-to-date average (Jan–Jul) | 80.9% | 61.1% | ▼ 24.5% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Partial coverage: domestic flights only · 22 of 22 periods have data
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Partial coverage: domestic flights only · 22 of 22 periods have data
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 5 | 1 | ▼ 80.0% |
| February | 2 | 0 | ▼ 100.0% |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 2 | – |
| June | 0 | 0 | – |
| July | 0 | 3 | – |
| August | 1 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 7 | 6 | ▼ 14.3% |
according to the US BTS · October 2024 → July 2026
This is not a forecast
This is a historical record of departures already flown, not a forecast for your flight.
This number flies several legs
Several legs: the headline figure averages all of them. See the leg table.
Cancellation share
- Not cancelled 97.9% 642
- Cancelled 2.1% 14
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
88 of 8
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BNA STL Nashville International Airport – St. Louis Lambert International Airport | 437 | 2.6 min | 93.5% | 114 |
| ICT DEN Wichita Dwight D. Eisenhower National Airport – Denver International Airport | 674 | 2.8 min | 94.9% | 59 |
| SJU MCO Luis Munoz Marin International Airport – Orlando International Airport | 1,913 | 14.9 min | 70.7% | 58 |
| STL ATL St. Louis Lambert International Airport – Hartsfield Jackson Atlanta International Airport | 779 | -2.8 min | 97.6% | 42 |
| LGA BNA LaGuardia Airport – Nashville International Airport | 1,228 | 21.0 min | 78.1% | 42 |
| BWI MDW Baltimore/Washington International Thurgood Marshall Airport – Chicago Midway International Airport | 981 | 69.9 min | 20.5% | 41 |
| MDW OKC Chicago Midway International Airport – OKC Will Rogers World Airport | 1,111 | 12.0 min | 66.7% | 39 |
| BWI DEN Baltimore/Washington International Thurgood Marshall Airport – Denver International Airport | 2,394 | 2.0 min | 93.9% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 14 | 14 | 71.4% | 0 |
| November 2024 | 30 | 30 | 96.7% | 0 |
| December 2024 | 32 | 32 | 90.6% | 0 |
| January 2025 | 31 | 26 | 100.0% | 5 |
| February 2025 | 36 | 34 | 79.4% | 2 |
| March 2025 | 32 | 32 | 93.8% | 0 |
| April 2025 | 22 | 22 | 81.8% | 0 |
| May 2025 | 22 | 22 | 54.6% | 0 |
| June 2025 | 20 | 20 | 75.0% | 0 |
| July 2025 | 22 | 22 | 81.8% | 0 |
| August 2025 | 29 | 28 | 53.6% | 1 |
| September 2025 | 30 | 30 | 86.7% | 0 |
| October 2025 | 22 | 22 | 50.0% | 0 |
| November 2025 | 28 | 28 | 100.0% | 0 |
| December 2025 | 29 | 29 | 89.7% | 0 |
| January 2026 | 30 | 29 | 89.7% | 1 |
| February 2026 | 25 | 25 | 96.0% | 0 |
| March 2026 | 55 | 55 | 67.3% | 0 |
| April 2026 | 33 | 33 | 66.7% | 0 |
| May 2026 | 27 | 25 | 56.0% | 2 |
| June 2026 | 41 | 41 | 19.5% | 0 |
| July 2026 | 46 | 43 | 32.6% | 3 |