WN4579
WN4579 (Southwest Airlines) is a multi-stop service on 17 routes, busiest Dallas to Tulsa. Of 368 departures recorded from October 2024 to July 2026, 69.1% left on time, according to the US BTS.
- On-time departures69.1%of 368 flights
- Average delay15.8 min
- July 202614▼ 67.4%vs July 2025
- Cancelled1.6%
- Legs flown under this number17
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods16 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 28 | 8 | ▼ 71.4% |
| February | 21 | 12 | ▼ 42.9% |
| March | 13 | 28 | ▲ 115.4% |
| April | 3 | 6 | ▲ 100.0% |
| May | – | – | – |
| June | 38 | 12 | ▼ 68.4% |
| July | 43 | 14 | ▼ 67.4% |
| August | 25 | – | – |
| September | 21 | – | – |
| October | – | – | in progress |
| November | 15 | – | – |
| December | 25 | – | – |
according to the US BTS · October 2024 → July 2026
On-time departures by month
Months without data are left blank.
On time = departure within 15 minutes of schedule. Non-cancelled flights with a recorded delay only.
The most recent periods16 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 82.1% | 62.5% | ▼ 23.9% |
| February | 76.2% | 54.6% | ▼ 28.4% |
| March | 76.9% | 100.0% | ▲ 30.0% |
| April | 33.3% | 83.3% | ▲ 150.0% |
| May | – | – | – |
| June | 81.6% | 90.9% | ▲ 11.4% |
| July | 69.1% | 50.0% | ▼ 27.6% |
| August | 24.0% | – | – |
| September | 28.6% | – | – |
| October | – | – | in progress |
| November | 78.6% | – | – |
| December | 68.0% | – | – |
according to the US BTS · October 2024 → July 2026
Average departure delay by month
Months without data are left blank.
according to the US BTS · October 2024 → July 2026
Cancelled departures by month
Months without data are left blank.
The most recent periods16 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | 0 | 1 | – |
| March | 0 | 1 | – |
| April | 0 | 0 | – |
| May | – | – | – |
| June | 0 | 1 | – |
| July | 1 | 0 | ▼ 100.0% |
| August | 0 | – | – |
| September | 0 | – | – |
| October | – | – | in progress |
| November | 1 | – | – |
| December | 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 98.4% 362
- Cancelled 1.6% 6
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
4| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DAL TUL Dallas Love Field – Tulsa International Airport | 383 | 12.2 min | 74.5% | 99 |
| SNA PHX John Wayne Orange County International Airport – Phoenix Sky Harbor International Airport | 544 | 24.1 min | 66.0% | 51 |
| SEA DEN Seattle–Tacoma International Airport – Denver International Airport | 1,645 | 43.0 min | 25.0% | 40 |
| TUL DAL Tulsa International Airport – Dallas Love Field | 383 | 0.1 min | 96.9% | 33 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 3 | 3 | 100.0% | 0 |
| November 2024 | 24 | 23 | 82.6% | 1 |
| December 2024 | 29 | 29 | 62.1% | 0 |
| January 2025 | 28 | 28 | 82.1% | 0 |
| February 2025 | 21 | 21 | 76.2% | 0 |
| March 2025 | 13 | 13 | 76.9% | 0 |
| April 2025 | 3 | 3 | 33.3% | 0 |
| June 2025 | 38 | 38 | 81.6% | 0 |
| July 2025 | 43 | 42 | 69.1% | 1 |
| August 2025 | 25 | 25 | 24.0% | 0 |
| September 2025 | 21 | 21 | 28.6% | 0 |
| November 2025 | 15 | 14 | 78.6% | 1 |
| December 2025 | 25 | 25 | 68.0% | 0 |
| January 2026 | 8 | 8 | 62.5% | 0 |
| February 2026 | 12 | 11 | 54.6% | 1 |
| March 2026 | 28 | 27 | 100.0% | 1 |
| April 2026 | 6 | 6 | 83.3% | 0 |
| June 2026 | 12 | 11 | 90.9% | 1 |
| July 2026 | 14 | 14 | 50.0% | 0 |