WN257
WN257 (Southwest Airlines) is a multi-stop service on 49 routes, busiest Chicago to Las Vegas. Of 788 departures recorded from October 2024 to July 2026, 73.0% left on time, according to the US BTS.
- On-time departures73.0%of 788 flights
- Average delay15.0 min
- July 202639▼ 13.3%vs July 2025
- Cancelled1.4%
- Legs flown under this number49
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 | 31 | 15 | ▼ 51.6% |
| February | 28 | 31 | ▲ 10.7% |
| March | 31 | 59 | ▲ 90.3% |
| April | 30 | 33 | ▲ 10.0% |
| May | 31 | 27 | ▼ 12.9% |
| June | 40 | 38 | ▼ 5.0% |
| July | 45 | 39 | ▼ 13.3% |
| August | 51 | – | – |
| September | 51 | – | – |
| October | 27 | – | in progress |
| November | 51 | – | – |
| December | 48 | – | – |
| Year to date (Jan–Jul) | 236 | 242 | ▲ 2.5% |
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 | 93.6% | 78.6% | ▼ 16.0% |
| February | 92.9% | 38.7% | ▼ 58.3% |
| March | 89.3% | 36.8% | ▼ 58.7% |
| April | 66.7% | 57.6% | ▼ 13.6% |
| May | 61.3% | 50.0% | ▼ 18.4% |
| June | 57.5% | 68.4% | ▲ 19.0% |
| July | 55.6% | 82.1% | ▲ 47.7% |
| August | 85.7% | – | – |
| September | 96.1% | – | – |
| October | 88.9% | – | in progress |
| November | 77.6% | – | – |
| December | 77.1% | – | – |
| Year-to-date average (Jan–Jul) | 73.8% | 58.9% | ▼ 20.2% |
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 | 1 | – |
| February | 0 | 0 | – |
| March | 3 | 2 | ▼ 33.3% |
| April | 0 | 0 | – |
| May | 0 | 1 | – |
| June | 0 | 0 | – |
| July | 0 | 0 | – |
| August | 2 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 3 | 4 | ▲ 33.3% |
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 98.6% 777
- Cancelled 1.4% 11
Share of all recorded flights in the period, all legs. · Oct 13, 2024 → Jul 31, 2026
On time, leg by leg
Departures within 15 minutes of schedule; small figure = departures recorded.
Legs flown under this number
11Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 17 | 17 | 100.0% | 0 |
| November 2024 | 29 | 29 | 93.1% | 0 |
| December 2024 | 36 | 36 | 88.9% | 0 |
| January 2025 | 31 | 31 | 93.6% | 0 |
| February 2025 | 28 | 28 | 92.9% | 0 |
| March 2025 | 31 | 28 | 89.3% | 3 |
| April 2025 | 30 | 30 | 66.7% | 0 |
| May 2025 | 31 | 31 | 61.3% | 0 |
| June 2025 | 40 | 40 | 57.5% | 0 |
| July 2025 | 45 | 45 | 55.6% | 0 |
| August 2025 | 51 | 49 | 85.7% | 2 |
| September 2025 | 51 | 51 | 96.1% | 0 |
| October 2025 | 27 | 27 | 88.9% | 0 |
| November 2025 | 51 | 49 | 77.6% | 2 |
| December 2025 | 48 | 48 | 77.1% | 0 |
| January 2026 | 15 | 14 | 78.6% | 1 |
| February 2026 | 31 | 31 | 38.7% | 0 |
| March 2026 | 59 | 57 | 36.8% | 2 |
| April 2026 | 33 | 33 | 57.6% | 0 |
| May 2026 | 27 | 26 | 50.0% | 1 |
| June 2026 | 38 | 38 | 68.4% | 0 |
| July 2026 | 39 | 39 | 82.1% | 0 |