WN1640
WN1640 (Southwest Airlines) is a multi-stop service on 29 routes, busiest Nashville to Pittsburgh. Of 512 departures recorded from October 2024 to July 2026, 69.5% left on time, according to the US BTS.
- On-time departures69.5%of 512 flights
- Average delay18.5 min
- July 202617▼ 45.2%vs July 2025
- Cancelled0.0%
- Legs flown under this number29
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 | 26 | 24 | ▼ 7.7% |
| February | 24 | 16 | ▼ 33.3% |
| March | 20 | 26 | ▲ 30.0% |
| April | 27 | 15 | ▼ 44.4% |
| May | 30 | 14 | ▼ 53.3% |
| June | 30 | 16 | ▼ 46.7% |
| July | 31 | 17 | ▼ 45.2% |
| August | 27 | – | – |
| September | 26 | – | – |
| October | 23 | – | in progress |
| November | 25 | – | – |
| December | 28 | – | – |
| Year to date (Jan–Jul) | 188 | 128 | ▼ 31.9% |
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 | 65.4% | 87.5% | ▲ 33.8% |
| February | 70.8% | 56.3% | ▼ 20.6% |
| March | 65.0% | 73.1% | ▲ 12.4% |
| April | 85.2% | 53.3% | ▼ 37.4% |
| May | 73.3% | 42.9% | ▼ 41.6% |
| June | 46.7% | 56.3% | ▲ 20.5% |
| July | 48.4% | 64.7% | ▲ 33.7% |
| August | 63.0% | – | – |
| September | 84.6% | – | – |
| October | 69.6% | – | in progress |
| November | 76.0% | – | – |
| December | 71.4% | – | – |
| Year-to-date average (Jan–Jul) | 65.0% | 62.0% | ▼ 4.6% |
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 | 0 | – |
| February | 0 | 0 | – |
| 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 | 0 |
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 100.0% 512
- Cancelled 0.0% 0
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 29, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
6| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| BNA PIT Nashville International Airport – Pittsburgh International Airport | 743 | 10.5 min | 77.2% | 57 |
| DEN BZN Denver International Airport – Bozeman Yellowstone International Airport | 844 | 9.4 min | 76.0% | 50 |
| SLC DEN Salt Lake City International Airport – Denver International Airport | 628 | 62.1 min | 37.2% | 43 |
| CLE MDW Cleveland Hopkins International Airport – Chicago Midway International Airport | 493 | 17.4 min | 72.5% | 40 |
| DEN SLC Denver International Airport – Salt Lake City International Airport | 628 | 9.8 min | 72.2% | 36 |
| TPA BWI Tampa International Airport – Baltimore/Washington International Thurgood Marshall Airport | 1,358 | 6.7 min | 87.9% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 23 | 23 | 82.6% | 0 |
| November 2024 | 16 | 16 | 93.8% | 0 |
| December 2024 | 28 | 28 | 85.7% | 0 |
| January 2025 | 26 | 26 | 65.4% | 0 |
| February 2025 | 24 | 24 | 70.8% | 0 |
| March 2025 | 20 | 20 | 65.0% | 0 |
| April 2025 | 27 | 27 | 85.2% | 0 |
| May 2025 | 30 | 30 | 73.3% | 0 |
| June 2025 | 30 | 30 | 46.7% | 0 |
| July 2025 | 31 | 31 | 48.4% | 0 |
| August 2025 | 27 | 27 | 63.0% | 0 |
| September 2025 | 26 | 26 | 84.6% | 0 |
| October 2025 | 23 | 23 | 69.6% | 0 |
| November 2025 | 25 | 25 | 76.0% | 0 |
| December 2025 | 28 | 28 | 71.4% | 0 |
| January 2026 | 24 | 24 | 87.5% | 0 |
| February 2026 | 16 | 16 | 56.3% | 0 |
| March 2026 | 26 | 26 | 73.1% | 0 |
| April 2026 | 15 | 15 | 53.3% | 0 |
| May 2026 | 14 | 14 | 42.9% | 0 |
| June 2026 | 16 | 16 | 56.3% | 0 |
| July 2026 | 17 | 17 | 64.7% | 0 |