WN1638
WN1638 (Southwest Airlines) is a multi-stop service on 24 routes, busiest Nashville to Phoenix. Of 649 departures recorded from October 2024 to July 2026, 79.9% left on time, according to the US BTS.
- On-time departures79.9%of 649 flights
- Average delay8.8 min
- July 202631▼ 24.4%vs July 2025
- Cancelled0.5%
- Legs flown under this number24
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 | 33 | 31 | ▼ 6.1% |
| February | 28 | 28 | 0.0% |
| March | 23 | 31 | ▲ 34.8% |
| April | 31 | 19 | ▼ 38.7% |
| May | 33 | 18 | ▼ 45.5% |
| June | 35 | 28 | ▼ 20.0% |
| July | 41 | 31 | ▼ 24.4% |
| August | 34 | – | – |
| September | 34 | – | – |
| October | 31 | – | in progress |
| November | 29 | – | – |
| December | 31 | – | – |
| Year to date (Jan–Jul) | 224 | 186 | ▼ 17.0% |
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 | 62.5% | 90.3% | ▲ 44.5% |
| February | 89.3% | 92.9% | ▲ 4.0% |
| March | 100.0% | 71.0% | ▼ 29.0% |
| April | 96.8% | 89.5% | ▼ 7.5% |
| May | 100.0% | 100.0% | 0.0% |
| June | 88.6% | 35.7% | ▼ 59.7% |
| July | 79.5% | 45.2% | ▼ 43.2% |
| August | 85.3% | – | – |
| September | 82.4% | – | – |
| October | 67.7% | – | in progress |
| November | 100.0% | – | – |
| December | 87.1% | – | – |
| Year-to-date average (Jan–Jul) | 88.1% | 74.9% | ▼ 14.9% |
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 | 1 | 0 | ▼ 100.0% |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 0 | 0 | – |
| July | 2 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 3 | 0 | ▼ 100.0% |
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 99.5% 646
- Cancelled 0.5% 3
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
10Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 14 | 14 | 78.6% | 0 |
| November 2024 | 28 | 28 | 71.4% | 0 |
| December 2024 | 38 | 38 | 60.5% | 0 |
| January 2025 | 33 | 32 | 62.5% | 1 |
| February 2025 | 28 | 28 | 89.3% | 0 |
| March 2025 | 23 | 23 | 100.0% | 0 |
| April 2025 | 31 | 31 | 96.8% | 0 |
| May 2025 | 33 | 33 | 100.0% | 0 |
| June 2025 | 35 | 35 | 88.6% | 0 |
| July 2025 | 41 | 39 | 79.5% | 2 |
| August 2025 | 34 | 34 | 85.3% | 0 |
| September 2025 | 34 | 34 | 82.4% | 0 |
| October 2025 | 31 | 31 | 67.7% | 0 |
| November 2025 | 29 | 29 | 100.0% | 0 |
| December 2025 | 31 | 31 | 87.1% | 0 |
| January 2026 | 31 | 31 | 90.3% | 0 |
| February 2026 | 28 | 28 | 92.9% | 0 |
| March 2026 | 31 | 31 | 71.0% | 0 |
| April 2026 | 19 | 19 | 89.5% | 0 |
| May 2026 | 18 | 18 | 100.0% | 0 |
| June 2026 | 28 | 28 | 35.7% | 0 |
| July 2026 | 31 | 31 | 45.2% | 0 |