WN4
WN4 (Southwest Airlines) is a multi-stop service on 18 routes, busiest Houston to Dallas. Of 488 departures recorded from October 2024 to July 2026, 93.2% left on time, according to the US BTS.
- On-time departures93.2%of 488 flights
- Average delay0.5 min
- July 202623▼ 17.9%vs July 2025
- Cancelled1.2%
- Legs flown under this number18
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 | 15 | 12 | ▼ 20.0% |
| February | 22 | 16 | ▼ 27.3% |
| March | 15 | 18 | ▲ 20.0% |
| April | 12 | 35 | ▲ 191.7% |
| May | 14 | 40 | ▲ 185.7% |
| June | 29 | 23 | ▼ 20.7% |
| July | 28 | 23 | ▼ 17.9% |
| August | 29 | – | – |
| September | 26 | – | – |
| October | 49 | – | in progress |
| November | 24 | – | – |
| December | 8 | – | – |
| Year to date (Jan–Jul) | 135 | 167 | ▲ 23.7% |
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 | 100.0% | 90.0% | ▼ 10.0% |
| February | 100.0% | 100.0% | 0.0% |
| March | 93.3% | 100.0% | ▲ 7.1% |
| April | 91.7% | 97.1% | ▲ 6.0% |
| May | 92.9% | 92.5% | ▼ 0.4% |
| June | 82.1% | 95.5% | ▲ 16.2% |
| July | 89.3% | 95.7% | ▲ 7.1% |
| August | 86.2% | – | – |
| September | 88.5% | – | – |
| October | 93.9% | – | in progress |
| November | 95.5% | – | – |
| December | 100.0% | – | – |
| Year-to-date average (Jan–Jul) | 92.8% | 95.8% | ▲ 3.3% |
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 | 2 | – |
| February | 0 | 0 | – |
| March | 0 | 0 | – |
| April | 0 | 0 | – |
| May | 0 | 0 | – |
| June | 1 | 1 | 0.0% |
| July | 0 | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 2 | – | – |
| December | 0 | – | – |
| Year to date (Jan–Jul) | 1 | 3 | ▲ 200.0% |
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 98.8% 482
- Cancelled 1.2% 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
2| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| HOU DAL William P. Hobby Airport – Dallas Love Field | 386 | -0.9 min | 95.0% | 347 |
| DAL BHM Dallas Love Field – Birmingham-Shuttlesworth International Airport | 942 | -1.3 min | 97.5% | 41 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 10 | 10 | 100.0% | 0 |
| November 2024 | 22 | 22 | 100.0% | 0 |
| December 2024 | 18 | 18 | 77.8% | 0 |
| January 2025 | 15 | 15 | 100.0% | 0 |
| February 2025 | 22 | 22 | 100.0% | 0 |
| March 2025 | 15 | 15 | 93.3% | 0 |
| April 2025 | 12 | 12 | 91.7% | 0 |
| May 2025 | 14 | 14 | 92.9% | 0 |
| June 2025 | 29 | 28 | 82.1% | 1 |
| July 2025 | 28 | 28 | 89.3% | 0 |
| August 2025 | 29 | 29 | 86.2% | 0 |
| September 2025 | 26 | 26 | 88.5% | 0 |
| October 2025 | 49 | 49 | 93.9% | 0 |
| November 2025 | 24 | 22 | 95.5% | 2 |
| December 2025 | 8 | 8 | 100.0% | 0 |
| January 2026 | 12 | 10 | 90.0% | 2 |
| February 2026 | 16 | 16 | 100.0% | 0 |
| March 2026 | 18 | 18 | 100.0% | 0 |
| April 2026 | 35 | 35 | 97.1% | 0 |
| May 2026 | 40 | 40 | 92.5% | 0 |
| June 2026 | 23 | 22 | 95.5% | 1 |
| July 2026 | 23 | 23 | 95.7% | 0 |