WN1437
WN1437 (Southwest Airlines) is a multi-stop service on 32 routes, busiest Nashville to Valparaiso. Of 755 departures recorded from October 2024 to July 2026, 77.7% left on time, according to the US BTS.
- On-time departures77.7%of 755 flights
- Average delay11.4 min
- July 202629▼ 50.8%vs July 2025
- Cancelled0.8%
- Legs flown under this number32
according to the US BTS · Oct 12, 2024 → Jul 29, 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 | 42 | 28 | ▼ 33.3% |
| February | 40 | 24 | ▼ 40.0% |
| March | 32 | 23 | ▼ 28.1% |
| April | 35 | 26 | ▼ 25.7% |
| May | 35 | 26 | ▼ 25.7% |
| June | 59 | 30 | ▼ 49.2% |
| July | 59 | 29 | ▼ 50.8% |
| August | 36 | – | – |
| September | 30 | – | – |
| October | 31 | – | in progress |
| November | 30 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 302 | 186 | ▼ 38.4% |
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 | 87.2% | 92.9% | ▲ 6.5% |
| February | 92.5% | 100.0% | ▲ 8.1% |
| March | 75.0% | 59.1% | ▼ 21.2% |
| April | 74.3% | 92.3% | ▲ 24.3% |
| May | 82.9% | 80.8% | ▼ 2.5% |
| June | 61.0% | 63.3% | ▲ 3.8% |
| July | 27.1% | 75.9% | ▲ 179.7% |
| August | 80.6% | – | – |
| September | 93.3% | – | – |
| October | 96.7% | – | in progress |
| November | 96.6% | – | – |
| December | 71.0% | – | – |
| Year-to-date average (Jan–Jul) | 71.4% | 80.6% | ▲ 12.9% |
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 | 3 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 1 | – | in progress |
| November | 1 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 3 | 1 | ▼ 66.7% |
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 99.2% 749
- Cancelled 0.8% 6
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
99 of 9
| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BNA VPS Nashville International Airport – Destin-Fort Walton Beach Airport | 628 | 2.6 min | 93.4% | 125 |
| SEA SJC Seattle–Tacoma International Airport – Mineta San Jose International Airport | 1,122 | 34.8 min | 43.3% | 60 |
| HNL OGG Daniel K. Inouye International Airport – Kahului International Airport | 162 | -3.4 min | 98.0% | 50 |
| PHL MCO Philadelphia International Airport – Orlando International Airport | 1,389 | 9.9 min | 90.0% | 50 |
| LGA HOU LaGuardia Airport – William P. Hobby Airport | 2,295 | 6.7 min | 90.0% | 50 |
| ECP BNA Northwest Florida Beaches International Airport – Nashville International Airport | 647 | -4.6 min | 100.0% | 46 |
| LAS FAT Harry Reid International Airport – Fresno Yosemite International Airport | 416 | 7.2 min | 78.6% | 42 |
| MDW SEA Chicago Midway International Airport – Seattle–Tacoma International Airport | 2,782 | 31.2 min | 40.0% | 35 |
| SAT BWI San Antonio International Airport – Baltimore/Washington International Thurgood Marshall Airport | 2,262 | -2.0 min | 96.7% | 31 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 26 | 26 | 80.8% | 0 |
| November 2024 | 38 | 38 | 94.7% | 0 |
| December 2024 | 45 | 45 | 84.4% | 0 |
| January 2025 | 42 | 39 | 87.2% | 3 |
| February 2025 | 40 | 40 | 92.5% | 0 |
| March 2025 | 32 | 32 | 75.0% | 0 |
| April 2025 | 35 | 35 | 74.3% | 0 |
| May 2025 | 35 | 35 | 82.9% | 0 |
| June 2025 | 59 | 59 | 61.0% | 0 |
| July 2025 | 59 | 59 | 27.1% | 0 |
| August 2025 | 36 | 36 | 80.6% | 0 |
| September 2025 | 30 | 30 | 93.3% | 0 |
| October 2025 | 31 | 30 | 96.7% | 1 |
| November 2025 | 30 | 29 | 96.6% | 1 |
| December 2025 | 31 | 31 | 71.0% | 0 |
| January 2026 | 28 | 28 | 92.9% | 0 |
| February 2026 | 24 | 24 | 100.0% | 0 |
| March 2026 | 23 | 22 | 59.1% | 1 |
| April 2026 | 26 | 26 | 92.3% | 0 |
| May 2026 | 26 | 26 | 80.8% | 0 |
| June 2026 | 30 | 30 | 63.3% | 0 |
| July 2026 | 29 | 29 | 75.9% | 0 |