WN1257
WN1257 (Southwest Airlines) is a multi-stop service on 34 routes, busiest Nashville to Pittsburgh. Of 670 departures recorded from October 2024 to July 2026, 76.5% left on time, according to the US BTS.
- On-time departures76.5%of 670 flights
- Average delay13.9 min
- July 202613▼ 73.5%vs July 2025
- Cancelled1.0%
- Legs flown under this number34
Recorded departures by month
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 | 36 | 34 | ▼ 5.6% |
| February | 35 | 26 | ▼ 25.7% |
| March | 32 | 31 | ▼ 3.1% |
| April | 16 | 50 | ▲ 212.5% |
| May | 14 | 57 | ▲ 307.1% |
| June | 49 | 16 | ▼ 67.3% |
| July | 49 | 13 | ▼ 73.5% |
| August | 28 | – | – |
| September | 22 | – | – |
| October | 31 | – | in progress |
| November | 32 | – | – |
| December | 29 | – | – |
| Year to date (Jan–Jul) | 231 | 227 | ▼ 1.7% |
according to the US BTS · October 2024 → July 2026
On-time departures by month
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 | 94.4% | 77.4% | ▼ 18.0% |
| February | 77.1% | 58.3% | ▼ 24.4% |
| March | 87.5% | 87.1% | ▼ 0.5% |
| April | 93.8% | 70.0% | ▼ 25.3% |
| May | 78.6% | 82.5% | ▲ 5.0% |
| June | 51.0% | 81.3% | ▲ 59.3% |
| July | 55.1% | 84.6% | ▲ 53.6% |
| August | 71.4% | – | – |
| September | 90.9% | – | – |
| October | 90.3% | – | in progress |
| November | 68.8% | – | – |
| December | 72.4% | – | – |
| Year-to-date average (Jan–Jul) | 76.8% | 77.3% | ▲ 0.7% |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
The most recent periods19 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 3 | – |
| February | 0 | 2 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 0 | 5 |
according to the US BTS · October 2024 → July 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 99.0% 663
- Cancelled 1.0% 7
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 29, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
7| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BNA PIT Nashville International Airport – Pittsburgh International Airport | 743 | 24.9 min | 61.5% | 78 |
| LIT DAL Bill & Hillary Clinton National Airport/Adams Field – Dallas Love Field | 476 | 5.3 min | 88.9% | 63 |
| DJT ISP President Donald J. Trump International Airport – Long Island MacArthur Airport | 1,696 | 13.9 min | 80.7% | 57 |
| DAL LGA Dallas Love Field – LaGuardia Airport | 2,219 | 22.2 min | 62.8% | 55 |
| MEM BNA Frederick W. Smith International Airport – Nashville International Airport | 322 | 29.7 min | 54.3% | 35 |
| BOS DEN Boston Logan International Airport – Denver International Airport | 2,816 | 4.7 min | 97.0% | 33 |
| SMF BUR Sacramento International Airport – Hollywood Burbank/Bob Hope Airport | 577 | 5.3 min | 90.3% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 22 | 20 | 90.0% | 2 |
| November 2024 | 19 | 19 | 94.7% | 0 |
| December 2024 | 29 | 29 | 75.9% | 0 |
| January 2025 | 36 | 36 | 94.4% | 0 |
| February 2025 | 35 | 35 | 77.1% | 0 |
| March 2025 | 32 | 32 | 87.5% | 0 |
| April 2025 | 16 | 16 | 93.8% | 0 |
| May 2025 | 14 | 14 | 78.6% | 0 |
| June 2025 | 49 | 49 | 51.0% | 0 |
| July 2025 | 49 | 49 | 55.1% | 0 |
| August 2025 | 28 | 28 | 71.4% | 0 |
| September 2025 | 22 | 22 | 90.9% | 0 |
| October 2025 | 31 | 31 | 90.3% | 0 |
| November 2025 | 32 | 32 | 68.8% | 0 |
| December 2025 | 29 | 29 | 72.4% | 0 |
| January 2026 | 34 | 31 | 77.4% | 3 |
| February 2026 | 26 | 24 | 58.3% | 2 |
| March 2026 | 31 | 31 | 87.1% | 0 |
| April 2026 | 50 | 50 | 70.0% | 0 |
| May 2026 | 57 | 57 | 82.5% | 0 |
| June 2026 | 16 | 16 | 81.3% | 0 |
| July 2026 | 13 | 13 | 84.6% | 0 |