WN21
WN21 (Southwest Airlines) is a multi-stop service on 12 routes, busiest Dallas to Houston. Of 135 departures recorded from October 2024 to July 2026, 82.8% left on time, according to the US BTS.
- On-time departures82.8%of 135 flights
- Average delay9.4 min
- July 20268
- Cancelled0.7%
- Legs flown under this number12
Recorded departures by month
All legs under this number combined; see the leg table.
Months without data are left blank.
The most recent periods14 periods
| Period | Departures 2025 | Departures 2026 | Change vs last year |
|---|---|---|---|
| January | 2 | 3 | ▲ 50.0% |
| February | – | – | – |
| March | 4 | 16 | ▲ 300.0% |
| April | 10 | 13 | ▲ 30.0% |
| May | 15 | 14 | ▼ 6.7% |
| June | – | – | – |
| July | – | 8 | – |
| August | 6 | – | – |
| September | 4 | – | – |
| October | 8 | – | in progress |
| November | 10 | – | – |
| December | 8 | – | – |
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 periods14 periods
| Period | On time 2025 | On time 2026 | Change vs last year |
|---|---|---|---|
| January | 100.0% | 100.0% | 0.0% |
| February | – | – | – |
| March | 75.0% | 68.8% | ▼ 8.3% |
| April | 100.0% | 92.3% | ▼ 7.7% |
| May | 86.7% | 78.6% | ▼ 9.3% |
| June | – | – | – |
| July | – | 87.5% | – |
| August | 66.7% | – | – |
| September | 100.0% | – | – |
| October | 100.0% | – | in progress |
| November | 80.0% | – | – |
| December | 75.0% | – | – |
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 periods14 periods
| Period | Cancelled 2025 | Cancelled 2026 | Change vs last year |
|---|---|---|---|
| January | 0 | 0 | – |
| February | – | – | – |
| March | 0 | 0 | – |
| April | 1 | 0 | ▼ 100.0% |
| May | 0 | 0 | – |
| June | – | – | – |
| July | – | 0 | – |
| August | 0 | – | – |
| September | 0 | – | – |
| October | 0 | – | in progress |
| November | 0 | – | – |
| 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 99.3% 134
- Cancelled 0.7% 1
Share of all recorded flights in the period, all legs. · Oct 12, 2024 → Jul 29, 2026
Legs flown under this number
1| Routes | Distance (km) | Avg delay | On time | Departures |
|---|---|---|---|---|
| DAL HOU Dallas Love Field – William P. Hobby Airport | 386 | 10.6 min | 81.7% | 72 |
Monthly figures
| Period | Departures | With departure delay recorded | On time | Cancelled |
|---|---|---|---|---|
| October 2024 | 3 | 3 | 100.0% | 0 |
| November 2024 | 3 | 3 | 100.0% | 0 |
| December 2024 | 8 | 8 | 50.0% | 0 |
| January 2025 | 2 | 2 | 100.0% | 0 |
| March 2025 | 4 | 4 | 75.0% | 0 |
| April 2025 | 10 | 9 | 100.0% | 1 |
| May 2025 | 15 | 15 | 86.7% | 0 |
| August 2025 | 6 | 6 | 66.7% | 0 |
| September 2025 | 4 | 4 | 100.0% | 0 |
| October 2025 | 8 | 8 | 100.0% | 0 |
| November 2025 | 10 | 10 | 80.0% | 0 |
| December 2025 | 8 | 8 | 75.0% | 0 |
| January 2026 | 3 | 3 | 100.0% | 0 |
| March 2026 | 16 | 16 | 68.8% | 0 |
| April 2026 | 13 | 13 | 92.3% | 0 |
| May 2026 | 14 | 14 | 78.6% | 0 |
| July 2026 | 8 | 8 | 87.5% | 0 |